FACT SHEET: The Truth about PZP

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PZP — The Pesticide

Porcine zona pellucida (PZP aka ZonaStat-H or Native PZP) is an EPA-registered pesticide derived from the ovaries of slaughtered pigs. PZP is approved for use on wild horses “in areas where they have become a nuisance ….” [20]

Some persons argue that, because PZP does not kill the mare, it is not really a “pesticide.” Actually, PZP does kill. As will be documented in this report, its use is associated with stillborn foals. In the long term, PZP will weaken a herd immunologically, which could swiftly lead to its extinction. So, yes, PZP is a real pesticide.

PZP — an Anti-Vaccine

While touted as a “vaccine,” PZP is actually a perversion of what a true vaccine is supposed to be. Instead of preventing disease, PZP causes disease — auto-immune disease. Thus, PZP is an anti-vaccine.

PZP’s Mode of Action as Stated in the Pesticide Registration Is a Disproved Hypothesis

The registrant of PZP advised the Environmental Protection Agency (EPA) that, based on information from the pesticide’s researcher-manufacturer, PZP works by generating antibodies that “block sperm attachment.” This representation of PZP as a sort of chemical condom was not fact but merely an untested hypothesis, postulated three decades ago. The old hypothesis was disproved by subsequent research. PZP’s manufacturer knew, or should have known, this. The manufacturer should also have been informed and up-to-date regarding the side effects and unintended consequences of PZP. Yet, the manufacturer continued to cite the disproved hypothesis and to deny that PZP has any adverse effects. [7 and 13]

PZP’s True Mode-of-Action

So how does PZP really work? PZP tricks the immune system into waging war on the ovaries. In a meta-analysis of ZP-type contraceptives, Kaur & Prabha (2014) reported that the infertility brought on by such products is ” … a consequence of ovarian dystrophy rather than inhibition of sperm-oocyte interaction.” Thus, PZP’s antibodies “work” not by blocking sperm attachment but by destroying the ovaries. Kaur & Prabha further disclosed that ” … histological examination of ovaries of immunized animals revealed the presence of atretic follicles with degenerating oocytes.” [5] [Atretic follicles are ovarian follicles in an undeveloped state due to immaturity, poor nutrition or systemic disease; manifested by prolonged anestrus.]

Kaur & Prabha’s review concluded that PZP’s antibodies induce ovarian dystrophy, oophoritis (inflammation of the ovaries), destruction of oocytes in all growing follicles, and depletion of resting follicles. The manufacturer of PZP as well as Bureau of Land Management (BLM) should have been aware of these and other findings about the pesticide. Yet they ignored or disregarded any information that was contrary to their personally-preferred but obsolete and false description of PZP’s mode-of-action.

PZP Manufacturer’s Own Research Found Markedly Depressed Estrogen Secretion

In a telling study published back in 1992, the manufacturer of Native PZP, along with colleagues, reported that ” … three consecutive years of PZP treatment may interfere with normal ovarian function as shown by markedly depressed oestrogen secretion.” [6] Thus, despite all the hype about PZP being non-hormonal, the manufacturer knew that ZonaStat-H has an adverse hormonal effect, causing significantly-lowered estrogen. Thus, PZP is an endocrine disruptor. [21] The plummeting estrogen-levels may also reflect the ovarian dystrophy and oophoritis now known to be caused by PZP. Despite personally discovering negative hormonal impacts 23 years ago, PZP’s manufacturer continued to cite misinformation regarding the product’s mode-of-action and endocrine-disruptor side-effects.

PZP Causes Ovarian Cysts

In their 2010 meta-analysis, Gray & Cameron cited a number of studies that found ” … alterations to ovarian function, oophoritis, and cyst formation with PZP treatment (Mahi-Brown et al.1988, Sehgal et al. 1989, Rhim et al. 1992, Stoops et al. 2006, Curtis et al. 2007).” [4] These findings support those of Kaur & Prabha while introducing yet another adverse effect: ovarian cysts. Gray & Cameron’s review also noted that increased irritability, aggression, and masculine behavior had been observed in females following PZP-treatment.

PZP → Endocrine Disruptor → Elevated Testosterone → Masculinizing Effects

Recall that PZP has endocrine-disrupting effects that result in lowered estrogen. Per the observed masculine behavior of treated mares, PZP seems to have a testosterone-elevating effect too. A deficit of estrogen alone would not necessarily manifest in the masculinization of treated females, but an excess of testosterone would. So, it appears that PZP disrupts at least two hormones: estrogen — by substantially lowering it — and testosterone — by substantially elevating it. Adverse effect: Unnatural behavior.

PZP → Ovarian Cysts → Elevated Testosterone → Masculinizing Effects

As discussed above, PZP correlates with abnormal masculine behavior on the part of treated females, a side-effect likely due to elevated testosterone. But in addition to the endocrine-disruption caused by PZP, there could be a second way for testosterone levels to become elevated. Recall that PZP causes ovarian cysts. An Internet search on “ovarian cysts and testosterone” yielded results for polycystic ovary syndrome (PCOS) in women. Interestingly, one of the symptoms of PCOS is high testosterone levels. [12 and 22] The connection between ovarian cysts and elevated testosterone suggests that the ovarian cysts caused by PZP could — either alone or in combination with PZP’s endocrine-disruptor effects — lead to high testosterone levels in treated females, as evidenced by their masculinized behavior.

PZP Causes Additional Adverse Effects

Gray & Cameron’s review also disclosed that, when PZP was administered to the females of a herd, males lost body condition while the oft-claimed improvement in female body condition did not hold up. Further, mares remained sexually active beyond the normal breeding season and had more estrus events.

PZP Selects for Weak Immune Function

Gray & Cameron’s analysis raised the possibility of PZP selecting for immuno-compromised individuals. Here’s why. Because PZP stimulates the immune system, it ironically works “best” — sterilizes faster — in mares that have strong immune-function. Such mares respond to the anti-vaccine and produce quantities of PZP antibodies that destroy their ovaries. But, conversely, PZP may not work at all in mares whose immune-function is weak or depressed. Those mares fail to respond to PZP. They keep getting pregnant and producing foals who, like their dam, suffer from weak immune-function. So, the PZP pesticide works against the very horses that Nature has best equipped for survival against disease while favoring and selecting for the immuno-compromised. Thus, a herd being treated with PZP is undergoing selective breeding for weak immunity, which puts the population at risk for disease — and ultimately, for extinction.

PZP Confers Dubious “Benefit” of Increased Longevity

Gray & Cameron also cited a study that found that “… PZP treated feral horse mares lived longer, resulting in a new age class (>25 years) not present before treatment ….” Exceptionally-long life is an ironic effect of PZP treatments. PZP’s manufacturer actually boasts about it, as if the anomaly were a good thing. However, Gray & Cameron questioned the supposed benefit of mares living much longer than their normal life expectancy. Indeed, such mares take up scarce slots within size-restricted populations. The ultra-elderly mares continue to consume resources for many years, but they no longer contribute to the gene-pool. It is detrimental to a population’s genetic viability to carry significant numbers of sterile herd-members way-beyond their normal life-span.

Research on Wildlife Contraceptives Revealed Stillbirths and Auto-Immune Oophoritis from PZP

There was an even earlier, definitive meta-analysis on wildlife contraceptives. Nettles (1997) reviewed 75 studies available at that time on the subject. Among his findings regarding PZP-use across different species, including horses, were: Stillbirths; altered ovarian structure and cyclicity; interference with normal ovarian function; permanent ovarian damage; and some cases of irreversible sterility due to auto-immune oophoritis, which suggested that PZP can be selective against a certain genotype in a population. [10] Many of these findings were confirmed by Kaur & Prabha as well as by Gray & Cameron. Please keep in mind these key findings: Stillbirths, and auto-immune oophoritis.

Recent Stillbirths Correlated with PZP

There is recent evidence confirming Nettles’ finding of a correlation between PZP treatments and subsequent stillbirths. In June 2015, Karen Sussman, President of the International Society for the Protection of Mustangs and Burros, reported that 7 mares previously treated with PZP at ISPMB, when taken off PZP, were able to get pregnant. However, 6 of those 7 mares — that is, 86 percent — produced foals that were stillborn. All other ISPMB mares that had not been injected with PZP successfully birthed healthy foals. Thus, given that environmental and other conditions were identical, the only variable was PZP. The dead foals have been sent to a university pathology department for autopsy. [18]

Autoimmune Oophoritis Induced by PZP

Research by the Rose-Cihakova-Caturegli Laboratory at Johns Hopkins Pathology found: “Automimmune oophoritis can be induced by immunization with testis and ovarian antigen murine human zona pellucida 3 peptide (pZP3) in adjuvant.” [16] Here again, is causation of autoimmune disease by a ZP-type product. This finding confirms other research cited herein.

Autoimmune Oophoritis and Risk of Other Autoimmune Diseases

A study by Varras et al. disclosed that, in humans, autoimmune oophoritis carries the risk of the patient developing other autoimmune diseases. [23] The correlation between autoimmune oophoritis and subsequent other autoimmune disorders weighs against injecting fillies and mares with PZP repeatedly and en masse.

Prolonged Breeding Season, Unusually-late Parturition Dates with PZP

Nettles’ meta-analysis on PZP disclosed other adverse effects: A prolonged breeding season and unusually-late parturition dates. (Parturition is the formal term for “giving birth.”) These findings have recently been confirmed, as is discussed below.

Parturition-Season Extends to Nearly Year-Round When a Herd Is Treated with PZP

A longitudinal study (Ransom et al. 2013) of three herds currently being managed by PZP — Little Book Cliffs, McCullough Peaks, and Pryor Mountain — found that the the parturition season lasted 341 days. [15] Ransom et al.’s finding of a nearly year-round birthing season supports the earlier finding by Nettles. Thus, during its period of potential reversibility, PZP’s effects wear off unpredictably. Out-of-season births put the life of both the mare and the foal in jeopardy. Nature designed the equine birthing-season to occur in Spring, not year-round, and certainly not in the dead of Winter.

Prolonged Delay in Recovery of Fertility

The same longitudinal study by Ransom et al. found that, after suspension of PZP, there was a delay lasting 411.3 days (1.13 years) per each year-of-treatment before mares recovered their fertility. What this means is that it takes that long, on average, for the ovaries to heal, to clear out all those cysts, and to regain some degree of normal hormonal function.

The question is: How is the delay in recovery-of-fertility addressed by BLM management practices? Answer: BLM ignores it. For instance, BLM currently administers PZP to Pryor Mountain’s fillies and mares starting at age 1½ — whom BLM artfully describes in the Environmental Assessment as fillies “becoming two year olds” — through age four. Thus, these fillies and mares receive intentional treatments for four consecutive years before being allowed the privilege of reproductive potentiality. Per Ransom et al.’s study, the Pryor Mountain fillies and mares would be expected to need 1,645.2 days (4.51 years) to regain reproductive capacity. But BLM gives the Pryor Mountain mares only 5 years off PZP before they are put back on it again — for the rest of their life. Thus, these fillies and mares might have just a six-month window — at best — in which to conceive. Due to the unpredictable timing of PZP’s wearing off, for some mares that window of fertility will close before they get a chance to produce a foal. Those mares’ genetic contribution will be zero.

As if the above scenario were not bad enough, PZP’s manufacturer conceded that it could take up to eight years to recover fertility after just three consecutive PZP treatments. [13]

Ransom Advises Proceeding with Caution regarding PZP

The Ransom et al. study warned: “Humans are increasingly attempting to manage the planet’s wildlife and habitats with new tools that are often not fully understood. The transient nature of the immunocontraceptive PZP can manifest into extraordinary persistence of infertility with repeated vaccinations, and ultimately can alter birth phenology in horses. This persistence may be of benefit for managing overabundant wildlife, but also suggests caution for use in small refugia or breeding facilities maintained for repatriation of rare species.” [15]

Because BLM keeps over 70 percent of the herds at levels below minimum-viable population (MVP), most herds qualify as “small refugia.” Pryor Mountain WHR is a small, isolated refuge, and its wild horses carry genes with rare alleles.

Ransom’s Exclusion of Seven Mares Evidences PZP’s Non-Effect on Immunocompromised Mares

In the “Data Collection” methodology section of the Ransom et al. report, the authors advised: “We omitted data for one female from the Little Book Cliffs and six females from McCullough Peaks because they produced offspring in every treatment year and thus were never effectively contracepted.”

This fact is important because it evidences PZP’s lack-of-efficacy on immunocompromised fillies and mares. To review: Because PZP activates the immune system, mares with naturally-low or depressed immune function do not “respond” to the treatment. It’s as if they had been injected with saline — their immune system is so weak that it does not react to the PZP by producing antibodies. The good news is such mares’ ovaries are saved from PZP’s destructive effects. The bad news is that these mares continue to become pregnant year after year, producing foals that will also tend to inherit low immune-function. Over time, the herd will become populated with more such low-immune horses because those with strong immunity get sterilized. Thus, PZP selects for horses with low immune function, which is bad for a herd in the long term. Even a routine infection could spread quickly and wipe out a population of horses with weak immune-function. If the goal is to preserve a herd, the use of PZP constitutes a worst management-practice.

BLM Was Fully-Aware of the Ransom Study but Suppressed the Findings

In their report, the authors of the Ransom et al. study gave a shout-out to BLM “for administrative and technical support throughout this project.” Thus, BLM was fully aware of the multi-year study while it was in progress and even lent support to it administratively and technically. Yet, in the case of the Pryor Mountain herd, BLM omitted this important report as a reference for the 2015 Environmental Assessment, which proposed intensifying the PZP “prescription.” Thus, BLM pretended that there was no such report and unethicallly suppressed it. Consequently, the public could not comment knowledgeably and appropriately on the continued use of — let alone the accelerated application of — PZP.

Three PZP Injections Can Trigger Sterility in Mares, or Just One Shot in Fillies Before Puberty

Disturbingly, another recent study on PZP (Knight & Rubenstein, 2014) found that ” … three or more consecutive years of treatment or administration of the first dose before sexual maturity may have triggered infertility in some mares. [9]

These findings are particularly troubling. They suggest that, actually, only two consecutive PZP-treatments may be reversible. Except, that is, in the case of fillies who have not yet reached puberty — they could be sterilized by just one injection. Recall the Pryor Mountain fillies, whose PZP treatments begin when they are just 1½ years old. They may not have reached puberty when they are initially treated. [1] And as we shall see later in this report, that first shot of PZP may not be their first shot of PZP.

Researchers Again Express Concerns about the Abnormal Life-Spans of Sterilized Mares

Knight & Rubenstein warned: “Inducing sterility, while relieving the mares from the energetic costs of lactation and reducing the stress from harem switching, may have unintended consequences on population dynamics by increasing longevity and eliminating the mares’ ability to contribute genetically.”

Knight & Rubenstein’s concerns support those of Gray & Cameron, who also questioned the supposed benefit of sterile mares’ extended life-spans. The abnormal numbers of aged, sterile mares count for census-purposes; but their presence disadvantages the younger horses, who become tageted for removal in order for BLM to achieve arbitrary management levels. Further, such mares no longer belong to the viable gene-pool.

PZP’s Destructive Antibodies Are Transmitted via the Placenta and Mother’s Milk

It gets worse. Sacco et al. reported that, per radioimmunoassay, PZP antibodies are transferred from mother to young via the placenta and milk. The transferred antibodies cross-react with and bind to the zonae pellucidae of female offspring, as demonstrated by immunofluorescent techniques. [17] These findings were disclosed in 1981. PZP’s manufacturer must have known about this dangerous effect, and certainly BLM should have investigated on its own whether there was any risk to the unborn or the nursing foal. Yet, the manufacturer continued to insist that there was no danger to the foal, whether born or unborn. [7 and 13] And in fact, BLM regularly administers PZP to pregnant and lactating mares, who transfer the destructive antibodies to their fetus, via the placenta, and to their foal, via mother’s milk.

Recall again the Pryor Mountain fillies. If their dams were injected with PZP while pregnant or nursing, such fillies will already have PZP antibodies cross-reacted with and bound to their zonae. Therefore, when those same fillies are injected at age 1½, it will be their second treatment, or potentially even their third. In fact, they could already have been sterilized in utero or while nursing, the treatment having been received prior to puberty, about which Knight & Rubenstein warned.

PZP Weakens Herd-Immunity, Posing Risk of Stochastic Events Leading to Herd-Extinction

To be self-sustaining, a herd needs to possess good immunity to withstand random catastrophes — known as stochastic events — such as contagious infections. There was such an event recently in Kazakhstan, where 120,000 endangered Saiga antelope — half the world’s population — died off suddenly and inexplicably within a two-week period. Scientists think a common bacterial infection was the cause of this mass-mortality event, but are unsure why the antelope were unable to fight off the disease immunologically. [14]

Imagine if such a catastrophe were to befall the Pryor Mountain horses, whose herd-immunity is being eroded by PZP. Note that the Saiga deaths involved antelope-mothers and their calves. If Pryor Mountain’s few fertile mares and their foals perished all of a sudden, that would leave just stallions and sterile old mares. The herd would be composed of the living dead, reproductively speaking, its rare alleles extinguished. BLM is failing to proactively manage the Pryor Mountain herd with stochastic events taken into consideration. That is malfeasance. PZP is a tool of immunological destruction, not of proper management.

PZP Continues the Use of Roundups and Removals

If the promise of PZP were true — if PZP really did eliminate the need to remove “excess” wild horses from the range — removals would have ended long ago in the Pryor Mountain Wild Horse Range, where PZP has been in use for approximately two decades. Yet removals are scheduled there with regularity every three years, the latest one in 2015.

Risks to Humans Who Administer PZP Injections

For staff and volunteers who inject wild horses with PZP, EPA’s Pesticide Fact Sheet advises that Personal Protective Equipment requirements include long sleeved shirt and long pants, gloves and shoes plus socks to mitigate occupational exposure. EPA specifically warns that pregnant women must not be involved in handling or injecting ZonaStat-H, and that all women should be aware that accidental self-injection may cause infertility. [20]

However, EPA’s Fact Sheet, the manufacturer’s training, and BLM’s operating procedures fail to inform pregnant women why it is so important that they strictly avoid PZP — because PZP’s antibodies cross the placenta and cross-react with and bind to an unborn female child’s own little zonae pellucidae. The baby-girl could be “anti-vaccinated” with PZP and even sterilized before birth.

EPA’s Fact Sheet, the manufacturer’s training, and BLM’s operating procedures fail to warn lactating women to avoid PZP and why — because PZP’s destructive antibodies would be passed along to a nursing female child via mother’s milk. The baby-girl could be “anti-vaccinated” with PZP and possibly sterilized simply from nursing.

EPA’s Fact Sheet, the manufacturer’s training, and BLM’s operating procedures fail to warn all women of the risk of ovarian dystrophy, oophoritis, ovarian cysts, and elevated testosterone-levels — in addition to infertility and, potentially, sterility — from unintentional self-injection.

EPA’s Fact Sheet, the manufacturer’s training, and BLM’s operating procedures fail to emphasize the magnitude of the risk — the PZP-in-question is a horse-size dose.

But Is There a Mandate to Practice Scientific Integrity?

Yes. The Department of the Interior’s (DOI) Code of Scientific and Scholarly Conduct applies to all staff members as well as to contractors, partners, permittees, and volunteers. The Code states: “Scholarly information considered in Departmental decision making must be robust, of the highest quality, and the result of as rigorous scientific and scholarly processes as can be achieved. Most importantly, it must be trustworthy.” [19]

BLM has ignored and suppressed independent scientific findings about PZP’s adverse effects and unintended consequences. Instead, BLM continues to rely almost exclusively on the manufacturer’s claims — shown and known to be false — regarding PZP’s safety for use on horses and for handling by humans. BLM is thus non-compliant with the Policy and malfeasant in its responsibilities to protect staff, volunteers, and the wild horses under its jurisdiction. BLM is also misleading and disinforming Congress and the American public about the PZP pesticide.

The manufacturer of PZP — a partner to BLM — misrepresented the pesticide as safe for use on animals by humans. The manufacturer knew or should have known that the former hypothesis regarding PZP’s mode-of-action had been disproved, and that PZP has dangerous side effects, safety-issues, and unintended consequences. Yet he hid and denied that information and failed to warn about PZP’s adverse effects. The manufacturer cited his own research as if it were definitive, and aggressively criticized independent researchers whose findings did not fully support his claims. Indeed, he recently submitted an Op-ed to The Salt Lake Tribune wherein he belittled the research of fellow scientists whose studies on PZP yielded results somewhat different from his own. [8] His accusations were so unreasonable that the scientists felt it necessary to submit an Op-ed in response to defend the integrity and validity of their work. [11] The manufacturer also disparaged members of the public — one of whom was a member of the Pennsylvania Game Commission — who expressed concerns about PZP. He dismissively accused them of “an attempt to mislead,” of “hyperbole,” of “knowingly manipulating information,” of “attempts to frighten people,” and of indulging in an “anti-intellectual approach to debates.” [7] By these actions, the manufacturer violated the DOI’s Code of Scientific and Scholarly Conduct.

PZP Manufacturer Misled Trainees into Believing that PZP Was Safe

BLM staff and volunteers receive their training from PZP’s manufacturer in how to handle and administer the pesticide. BLM is remiss in delegating the training to the manufacturer without verifying the adequacy of the instruction and the truthfulness of it. Two comments recorded recently in the media suggest that PZP’s manufacturer misled not just the public-at-large but those who received training therefrom in how to administer PZP.

First, the manufacturer has been quoted as saying that PZP is “so safe it is boring.” [3] Independent research shows otherwise — that PZP is a powerful hormone disruptor that could sterilize a female with just one injection. If trainees believe that PZP is boringly safe, they will be less likely to protect themselves adequately from this dangerous pesticide. Indeed, many of the trainees are women and, therefore, particularly at risk. Likewise, wild-horse advocates are lulled into complacency, trusting that PZP is harmless to the Pryor Mountain horses and their rare genetic alleles. Of course, none of that is true.

Second, a PZP supporter, who self-identified as a recent completer of the PZP-darting training program conducted by the manufacturer, said in a comment posted to a news article: “I just received my FDA certification to handle and administer Native PZP. Would you be so kind to provide a link to the study you keep referencing? To my knowledge, and those teaching the Native PZP certification class, there are no side effects of the PZP produced by Dr. Kirkpatrick and his team, which is Native PZP.” [2] Key words: “no side effects.” It is disturbing that a person who was, no doubt, motivated by a desire to help the horses has been disinformed regarding PZP’s safety-hazards to humans as well as to horses.

BLM Fails to Maintain Proper Supervision of the PZP Volunteers

The issue of safety is not the only concern. As BLM has admitted, volunteers darted the wrong mares on Pryor Mountain. These errors evidence that BLM has failed to maintain supervisory control over the volunteer-inoculators, allowing them to conduct the PZP-darting by themselves. The mistakes further evidence that the volunteers do not understand what is expected of them. Who can say whether other procedures were not complied with either. The fact that mares were darted who were ineligible for PZP per the then-current protocol, but who would be eligible under the proposed-but-not-yet-promulgated new “prescription,” suggests that the volunteers may have concluded — from BLM’s open contempt for the Constitution and disrespect for the NEPA process — that was okay for them to start darting otherwise-ineligible mares right away. Not surprisingly, BLM blames the volunteers for these mistakes, but probably has not informed them that they are being made to take the rap for management’s shortcomings.


PZP is appropriately categorized as a pesticide by the EPA. PZP “works” by tricking the immune system into attacking and destroying the ovaries. PZP has many adverse effects as well as unintended consequences. PZP presents safety-hazards to humans who handle it. PZP is a dangerous pesticide whose use is antithetical to the spirit and intent of the Wild and Free-Roaming Horses and Burros Act. BLM’s continuing to use PZP while ignoring and suppressing the evidence of its harmful effects constitutes malfeasance.


This report was completed by Marybeth Devlin on December 24, 2015. Copyright Marybeth Devlin and Protect Mustangs 2015.


1. EquiMed staff. (2010, March 13) Equine Reproductive Maturity in Mares and Stallions. Puberty in Equines. Retrieved from http://equimed.com/health-centers/reproductive-care/articles/equine-reproductive-maturity-in-mares-and-stallions

2. EWCS. (2015, November 10). Re: “Contraceptive could reduce taxpayer costs for wild horses.” Retrieved from http://wyomingpublicmedia.org/post/contraceptive-could-reduce-taxpayer-costs-wild-horses#comment-2352628323

3. Ferguson, Mike. (2015, June 4) “Police called as group protests wild horse contraceptives.” The Billings Gazette. Retrieved from http://billingsgazette.com/news/state-and-regional/montana/police-called-as-group-protests-wild-horse-contraceptives/article_81462303-e128-5ee8-a7ef-2c8b098450f6.html

4. Gray, M.E. and Cameron, E.Z. (2010) Does contraceptive treatment in wildlife result in side effects? A review of quantitative and anecdotal evidence. Reproduction 139, 45-55. Online publication date: 1-Jan-2010. Retrieved at http://www.reproduction-online.org/content/139/1/45.full

5. Kaur, Kiranjeet and Prabha, Vijay. (2014) “Immunocontraceptives: New Approaches to Fertility Control,” BioMed Research International, vol. 2014, Article ID 868196, 15 pages, 2014. doi:10.1155/2014/868196. Retrieved from http://downloads.hindawi.com/journals/bmri/2014/868196.pdf

6. Kirkpatrick, J. F., I. K. M. Liu, J. W. Turner, Jr., R. Naugle, and R. Keiper. 1992a. Long-term effects of porcine zonae pellucidae immunocontraception on ovarian function of feral horses (Equus caballus). J. Reprod. Fert. 94:437-444. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/1317449

7. Kirkpatrick, Jay. 2007. “Response to PA [Pennsylvania] Game Commission.” Posted on PNC’s Wildlife Forever Home Page. Retrieved from http://www.pzpinfo.org/home.html

8. Kirkpatrick, Jay F. (2015, May 16). Op-ed: Wild-horse contraceptives are based on sound science. The Salt Lake Tribune. Retrieved from http://www.sltrib.com/opinion/2517266-155/op-ed-wild-horse-contraceptives-are-based-on?fullpage=1

9. Knight, Colleen M., Rubenstein, Daniel I. 2014. The Effects of Porcine Zona Pellucida Immunocontraception on Health and Behavior of Feral Horses (Equus caballus). Princeton University Thesis, Ecology and Evolutionary Biology. Retrieved from http://dataspace.princeton.edu/jspui/handle/88435/dsp01vt150j42p

10. Nettles, Victor F. (1997) Potential consequences and problems with wildlife contraceptives. Reproduction, Fertility and Development 9(1) 137 – 144. Retrieved from http://www.publish.csiro.au/paper/R96054.htm Accessed full pdf text via purchase of a copy from Csiro Publishing.

11. Nuñez, Cassandra, Jim Adelman and Dan Rubenstein. (2015, July 3). Op-ed: Wild horse contraception not without unintended consequences. The Salt Lake Tribune. Retrieved from http://www.sltrib.com/opinion/2653298-155/op-ed-wild-horse-contraception-not-without

12. PCOS Foundation. (2015) What Causes PCOS? Retrieved from http://www.pcosfoundation.org/what-is-pcos

13. PNC, Inc. (Pity Not Cruelty). PZP FAQs. (2006) “Frequently Asked Questions on Immunocontraception.” (Special thanks to Jay Kirkpatrick and Rick Naugle for additions and corrections). Retrieved from http://www.pzpinfo.org/pzp_faqs.html

14. Raab. Lauren. (2015, May 31) “120,000 endangered saiga antelopes die mysteriously in Kazakhstan.” Los Angeles Times. Retrieved from http://www.latimes.com/science/sciencenow/la-sci-sn-saiga-antelope-die-off-20150531-story.html

15. Ransom JI, Hobbs NT, Bruemmer J (2013) Contraception Can Lead to Trophic Asynchrony between Birth Pulse and Resources. PLoS ONE 8(1): e54972. doi:10.1371/journal.pone.0054972. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/23383018

16. Rose-Cihakova-Caturegli Laboratory. (n.d.) Autoimmune Oophoritis. Johns Hopkins Pathology. Retrieved from http://pathology.jhu.edu/department/RCCLab/Oophoritis.cfm

17. Sacco AG, Subramanian MG, Yurewicz EC. (1981) Passage of zona antibodies via placenta and milk following active immunization of female mice with porcine zonae pellucidae. J Reprod Immunol. 1981 Dec;3(6):313-22. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/7328557

18. Sussman, Karen. (2015 June 6) “Suspicious Deaths with Use of Anti-Fertility Drugs.” International Society for the Protection of Mustangs and Burros. Retrieved from http://www.ispmb.org/BirthControlDeaths.html

19. United States Department of the Interior. Integrity of Scientific and Scholarly Activities Policy. Code of Conduct. Retrieved from https://www.doi.gov/scientificintegrity

20. United States Environmental Protection Agency. Office of Chemical Safety and Pollution Prevention. Pesticide Fact Sheet. Porcine Zona Pellucida (PZP). New Chemical. Nonfood Use. January 2012. Retrieved from

21. U.S. Department of Health and Human Services. National Institutes of Health. Endocrine Disruptors. Retrieved from http://www.niehs.nih.gov/health/topics/agents/endocrine/

22. U.S. National Library of Medicine. National Institutes of Health. Ovarian overproduction of androgens. Retrieved from https://www.nlm.nih.gov/medlineplus/ency/article/001165.htm

23. Varras M, Anastasiadis A, Panelos J, Balassi E, Demou A, Akrivis CH. (2013) Autoimmune oophoritis: Clinical presentation of an unusual clinical entity. OA Case Reports 2013 Jan 31;2(1):7. Retrieved from http://www.oapublishinglondon.com/article/369#

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Protect Mustangs is a nonprofit organization who protects and preserves native and wild horses.

Does PZP result in wild herds with lower immune systems and potential for die-offs?

PM Tule Elk Males FIghting by austlee

PZP is an immunocontraceptive and pesticide which causes an immune reaction to reject fertilization, while the females still come into estrus. Besides wrecking havoc on the immune system, injecting herds with PZP results in more fighting between males and many other behavior abnormalities.

Tule elk in Pt. Ryes National Seashore (Marin County, California) were part of a PZP (Porcine Zona Pellucida) experiment. Several years later there was a strange die-off.

Wildlife groups blamed park service management for leaving the elk fenced in during a drought–claiming that was the reason for the die-off.

Park service officials said the tule elk had water during the die-off.

“Some wildlife advocates have termed the situation a “die-off” and accuse the park service of allowing the elk to perish behind the fence that prevents them from finding enough food and water. Park service officials have a different view of what caused the population drop, and are hoping that new data will help address these concerns, especially as visitor interest peaks during the fall rutting season.” from: https://baynature.org/articles/on-the-fence/

Listen to Wildlife Ecologist Dave Press Discusses Tomales Point Elk and mention “there was water in the pond up there . . .” at 2:18.


It’s time to connect the dots and ask the obvious question: Did PZP lower the herds’ immune system and genetic diversity to the point of making them vulnerable to a die-off?

With suspect data regarding the long-term use of PZP on wild herds, more questions and answers are needed to prevent a similar die-off in America’s wild horses & burros.

With regards to wild horses, keep in mind what Marybeth Devlin wrote about PZP:

“PZP is a registered pesticide whose mechanism-of-action is to cause auto-immune disease. PZP tricks the immune system into producing antibodies that target and attack the ovaries. PZP’s antibodies cause the mare to suffer ovarian dystrophy, oophoritis (inflammation of the ovaries), ovarian cysts, destruction of oocytes in growing follicles, and depletion of resting follicles. Not surprisingly, estrogen levels drop markedly as the ovaries are slowly destroyed. But PZP’s adverse effects are not limited to the individual animal. As a recent study — which included the Little Book Cliffs, Colorado herd and the McCullough Peaks, Wyoming herd — found, PZP extends the birthing season to nearly year-round. Out-of-season births put the life of the foals and the mares at risk. Further, the same study disclosed that the pesticide causes a delay lasting 411.3 days (1.13 years) per each year-of-treatment before mares recover their fertility after suspension of PZP. However, some mares never recover — they are left permanently sterile, and quickly too. Indeed, yet another study found that sterility could occur in some mares from just three years of PZP injections or from just one treatment if the pesticide were given to a filly before she reached puberty. Because PZP messes with the immune system, it ironically works “best” — sterilizes faster — if the mare has a strong immune system. But, conversely, PZP may not work at all in mares whose immune function is weak or depressed. So, the pesticide discriminates against the very horses that Nature has best equipped for survival against disease while favoring and selecting for the immuno-compromised. Worse yet, tests performed via radioimmunoassay indicated that PZP antibodies are transferred from mother to young via the placenta and milk. The transferred antibodies cross-react with and bind to the zonae pellucidae of female offspring, as demonstrated by immunofluorescent techniques.”  [From: http://protectmustangs.org/?p=8529]


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Links of interest™:

Immunocontraception (Wikipedia): https://en.wikipedia.org/wiki/Immunocontraception

“Whenever an immune response is provoked, there is some risk of autoimmunity. Therefore immunocontraception trials typically check for signs of autoimmune disease.[17] One concern with zona pellucida vaccination, in particular, is that in certain cases it appears to be correlated with ovarian pathogenesis.[2] However, ovarian disease has not been observed in every trial of zona pellucida vaccination, and when observed, has not always been irreversible.[18]”


Autoimmune disease (Wikipedia): https://en.wikipedia.org/wiki/Autoimmune_disease 

“Autoimmune diseases arise from an abnormal immune response of the body against substances and tissues normally present in the body (autoimmunity). . .”


ZonaStat-H is the EPA restricted-use pesticide–PZP–for wild horses and burros the registrant calls “pests”: http://www3.epa.gov/pesticides/chem_search/reg_actions/pending/fs_PC-176603_01-Jan-12.pdf


Tule elk: http://www.nps.gov/pore/learn/nature/tule_elk.htm


Tule elks at Pt. Reyes National Seashore (National Park Service): http://www.nps.gov/pore/getinvolved/supportyourpark/upload/volunteer_docent_info_tule_elk_elkmanagement_v5.0_1.pdf


Challenges face tule elk management in Point Reyes National Seashore  http://www.mercurynews.com/pets-animals/ci_28311296/challenges-face-tule-elk-management-point-reyes-national

“Earlier this year park service officials revealed that more than 250 tule elk died inside the fenced area over a two-year period, in part because pools that the herds rely on for water had gone dry. Meanwhile, ranchers are complaining about the free-range elk getting on their land and eating grass and drinking water intended for their dairy cattle and other agricultural operations.”


Paratuberculosis or Johne’s disease (Wikipedia): https://en.wikipedia.org/wiki/Paratuberculosis


Testing for Mycobacterium avium subsp. paratuberculosis infection in asymptomatic free-ranging tule elk from an infected herd.  http://www.ncbi.nlm.nih.gov/pubmed/12910759

“Forty-five adult tule elk (Cervus elaphus nannodes) in good physical condition were translocated from a population located at Point Reyes National Seashore, Marin County (California, USA), to a holding pen 6 mo prior to release in an unfenced region of the park. Because infection with Mycobacterium avium subsp. paratuberculosis (Mptb) had been reported in the source population, the translocated elk underwent extensive ante-mortem testing using three Johne’s disease assays: enzyme linked immunosorbent assay (ELISA); agar gel immunodiffusion assay (AGID), and fecal culture. Isolation of Mptb was made from fecal samples in six of 45 elk (13%). All AGID results were negative while ELISA results for 18 elk (40%) were considered elevated. Elevated ELISA results or Mptb isolation from fecal samples were obtained for 22 of 45 elk (49%); these elk were euthanized and necropsied. Mycobacterium avium subsp. paratuberculosis was isolated from tissue in 10 of 22 euthanized elk (45%); of these 10 cases of confirmed infection, eight had elevated ELISA results (80%) and four were fecal culture positive (40%). One of 10 cases had histopathologic lesions consistent with Mptb infection. Mycobacterium avium subsp. paratuberculosis was also isolated from tissue from one of eight fetuses sampled. The number of tule elk found to be infected was unexpected, both because of the continued overall health of the source herd and the normal clinical status of all study animals.”


Mycobacterium avium subspecies paratuberculosis and Mycobacterium avium subsp. avium infections in a tule elk (Cervus elaphus nannodes) herd. 2006. http://www.ncbi.nlm.nih.gov/pubmed/17255437 

“Between 2 August and 22 September 2000, 37 hunter-killed tule elk (Cervus elaphus nannodes) were evaluated at the Grizzly Island Wildlife Area, California, USA, for evidence of paratuberculosis. Elk were examined post-mortem, and tissue and fecal samples were submitted for radiometric mycobacterial culture. Acid-fast isolates were identified by a multiplex polymerase chain reaction (PCR) that discriminates among members of the Mycobacterium avium complex (MAC). Histopathologic evaluations were completed, and animals were tested for antibodies using a Johne’s enzyme-linked immunosorbent assay (ELISA) and agar gel immunodiffusion. In addition, 104 fecal samples from tule elk remaining in the herd were collected from the ground and submitted for radiometric mycobacterial culture. No gross lesions were detected in any of the hunter-killed animals. Mycobacterium avium subsp. paratuberculosis (MAP) was cultured once from ileocecal tissue of one adult elk and was determined to be a strain (A18) found commonly in infected cattle. One or more isolates of Mycobacterium avium subsp. avium (MAA) were isolated from tissues of five additional adult elk. Gastrointestinal tract and lymph node tissues from 17 of the 37 elk (46%) examined had histopathologic lesions commonly seen with mycobacterial infection; however, acid-fast bacteria were not observed. All MAC infections were detected from adult elk (P = 0.023). In adult elk, a statistically significant association was found between MAA infection and ELISA sample-to-positive ratio (S/P) > or = 0.25 (P=0.021); four of five MAA culture-positive elk tested positive by ELISA. Sensitivity and specificity of ELISA S/P > or = 0.25 for detection of MAA in adult elk were 50% and 93%, respectively. No significant associations were found between MAC infection and sex or histopathologic lesions. Bacteriologic culture confirmed infection with MAP and MAA in this asymptomatic tule elk herd. The Johne’s ELISA was useful in signaling mycobacterial infection on a population basis but could not discriminate between MAA and MAP antibodies. The multiplex PCR was useful in discriminating among the closely related species belonging to MAC.
Between 2 August and 22 September 2000, 37 hunter-killed tule elk (Cervus elaphus nannodes) were evaluated at the Grizzly Island Wildlife Area, California, USA, for evidence of paratuberculosis. Elk were examined post-mortem, and tissue and fecal samples were submitted for radiometric mycobacterial culture. Acid-fast isolates were identified by a multiplex polymerase chain reaction (PCR) that discriminates among members of the Mycobacterium avium complex (MAC). Histopathologic evaluations were completed, and animals were tested for antibodies using a Johne’s enzyme-linked immunosorbent assay (ELISA) and agar gel immunodiffusion. In addition, 104 fecal samples from tule elk remaining in the herd were collected from the ground and submitted for radiometric mycobacterial culture. No gross lesions were detected in any of the hunter-killed animals. Mycobacterium avium subsp. paratuberculosis (MAP) was cultured once from ileocecal tissue of one adult elk and was determined to be a strain (A18) found commonly in infected cattle. One or more isolates of Mycobacterium avium subsp. avium (MAA) were isolated from tissues of five additional adult elk. Gastrointestinal tract and lymph node tissues from 17 of the 37 elk (46%) examined had histopathologic lesions commonly seen with mycobacterial infection; however, acid-fast bacteria were not observed. All MAC infections were detected from adult elk (P = 0.023). In adult elk, a statistically significant association was found between MAA infection and ELISA sample-to-positive ratio (S/P) > or = 0.25 (P=0.021); four of five MAA culture-positive elk tested positive by ELISA. Sensitivity and specificity of ELISA S/P > or = 0.25 for detection of MAA in adult elk were 50% and 93%, respectively. No significant associations were found between MAC infection and sex or histopathologic lesions. Bacteriologic culture confirmed infection with MAP and MAA in this asymptomatic tule elk herd. The Johne’s ELISA was useful in signaling mycobacterial infection on a population basis but could not discriminate between MAA and MAP antibodies. The multiplex PCR was useful in discriminating among the closely related species belonging to MAC.”


Epizootic of paratuberculosis in farmed elk http://www.johnes.org/handouts/files/Elk_outbreak.pdf




Immuno-Contraception Research for Managing Tule Elk Population – Phase I Scheduled to Begin on August 6, 1997 http://www.nps.gov/pore/learn/news/newsreleases_19970805_elkimmunocontraception97.htm

“. . . Funding for tule elk projects has come from a variety of sources. To date, monetary support and in-kind services for the tule elk project has been received from the Rocky Mountain Elk Foundation, Point Reyes National Seashore Association, Committee for the Preservation of Tule Elk, California Department of Fish and Game, The Humane Society of the United States (HSUS), University of California at Davis, the National Park Service Natural Resource Preservation Program and In Defense of Animals.” [Evidently Suzanne Roy, currently the Director of the American Wild Horse Preservation Campaign–who pushes PZP based management–was working for IDA at the time.]


Immuno-Contraception Research for Managing Tule Elk Population – Phase II Scheduled to Begin on June 15, 1998  http://www.nps.gov/pore/learn/news/newsreleases_19980615_elkimmunocontraception98.htm

“. . . During the second phase of the contraceptive research project, the first vaccine will be administered by direct syringe injection. To administer the injection, 30 elk will be captured from a helicopter and hobbled by ground crews. Scientists will gather data on the individual elk and place a radio collar on each of the elk. The collar will allow scientists to follow the individual elk to determine the effectiveness of the contraceptive. After several weeks, a booster shot will be remotely administered, from ranges of 30 to 150 feet, by means of self-injecting darts. The darts are brightly colored and easily retrieved. A single annual booster inoculation will be administered to continue contraceptive effects for successive breeding seasons.”


Use of porcine zona pellucida (PZP) vaccine as a contraceptive agent in free-ranging tule elk (Cervus elaphus nannodes). published 2002: http://www.ncbi.nlm.nih.gov/pubmed/12220156 

Abstract (note only a 5 year study. Why aren’t they studying the truly long-term effects?)
The potential for the application of porcine zona pellucida (PZP) immunocontraception in wildlife population management has been tested over a 15 year period and promises to provide a useful wildlife management tool. These studies have provided evidence indicating that the use of PZP immunocontraception in wildlife: (i) is effective at both the physiological and population level (Liu et al., 1989; Kirkpatrick et al., 1996; Turner et al., this supplement); (ii) is deliverable by remote means (Kirkpatrick et al., 1990; Shideler, 2000); (iii) is safe in pregnant animals (Kirkpatrick and Turner, this supplement); (iv) is reversible (Kirkpatrick et al., 1991; Kirkpatrick and Turner, this supplement); (v) results in no long-term debilitating health problems (Kirkpatrick et al., 1995; Turner and Kirkpatrick, this supplement); (vi) has no implications for passage through the food chain (Harlow and Lane, 1988); and (vii) is reasonably inexpensive (J. F. Kirkpatrick, personal communication). This report presents the results of a 5 year study in tule elk (Cervus elaphus nannodes), 3 years of which were on the application of PZP immunocontraception to an expanding elk population living in a wilderness area of Point Reyes National Seashore in Marin County, CA…”


Copyright Protect Mustangs.org 2016

Feds want to use 11 million tax dollars to experiment on American Wild Horses and Burros

Note from Protect Mustangs: If you don’t like this then: 1.) Go see your congressional representative this week and ask them to intervene to stop these horrible experiments on America’s wild horses who are being managed to extinction. 2.) Sign and share this petition and email it to everyone you know: https://www.change.org/p/defund-and-stop-the-wild-horse-burro-roundups Groups like The Cloud Foundation and the coalition led by The American Wild Horse Preservation Campaign seem to be misleading the public because they have chosen pushing PZP (controlled by The Humane Society of the United States) over championing wild horse freedom on public land. They slip appeals for PZP in the bottom of their online petitions hoping the public won’t notice what they are signing. That was the beginning of this slippery slope towards experimentation and extinction. Why? Follow the money, fear mongering and the seduction to campaign for drugging wild horses and burros with a risky pesticide made from slaughterhouse pig ovaries to block fertility. . . 3.) It’s time to join Protect Mustangs to protect our national treasures. Go to www.ProtectMustangs.org to sign up. 4.) You can donate to the Wild Horse Legal Fund also. The crowd funding link is here: https://www.gofundme.com/MustangLaw2016 or donate by www.PayPal.com to Contact@ProtectMustangs.org and please mark your donation is for the “Legal Fund”. Thank you for taking action today! Together we can turn this around.

The Bureau of Land Management (BLM) wants to use American tax dollars in several cruel experiments to develop methods of wild horse and burro population control–despite the fact that there is no overpopulation of wild horses or burros. The BLM anticipates the total cost of the experiments to be $11 million over 5 years.The research is being conducted by university scientists as well as scientists from the U.S. Geological Survey.

Research with Universities results in experimenting on wild horses and burros

In its 2013 report to the BLM, the National Academy of Sciences (NAS) found that no highly effective, easily delivered and affordable fertility-control methods were currently available for use on wild horses and burros. The most promising birth control, PZP, made from slaughterhouse pig ovaries, is limited in the duration of its effectiveness (1-2 years). At the same time, after multiple applications or if applied to young fillies it permanently sterilizes native wild horses.

The BLM released a solicitation for experimentation to develop new or improve existing population growth suppression methods for wild horses. (http://www.blm.gov/wo/st/en/info/newsroom/2015/july/nr_07_07_2015.html)  The following seven research projects were reviewed and recommended by an NAS panel of experts and are consistent with recommendations made to the BLM by its Wild Horse and Burro Advisory Board who is biased against wild horses and prefers livestock use public land for cheap grazing.

Wild Horse & Burro Advisory Board Meeting in 2013


© EquineClinic.comn shared for educational purposes

© EquineClinic.comn shared for educational purposes

1. Evaluation of minimally invasive methods of contraception in wild horse and burro mares: tubal ligation and hysteroscopically-guided oviduct papilla laser ablation. This was pushed by pro-slaughter advocates who want the horses free of fertility control drugs so they can go to slaughter eventually.

Recipient: Oregon State University
Summary: A one-year experiment that will aim to develop a minimally invasive surgical sterilization method for wild horse mares that requires no incisions.
Details: In an effort to develop minimally invasive, low-risk techniques for contraception and population control in female wild horses and burros, the experiment will evaluate two procedures, tubal ligation and hysteroscopically-guided laser ablation of the oviduct papilla in standing sedated females. For tubal ligation, the research team hypothesizes that a flexible endoscope inserted through a small incision in the vaginal vault will allow visualization of each oviduct in mares. Use of a diode laser or cautery instrument will allow effective fulguration followed by bloodless sectioning of the oviduct. This procedure should allow successful sterilization of up to 100% of female wild horses and burros gathered in any particular location as a single event. For the hysteroscopic procedure, the recipients expect to endoscopically visualize each oviduct papilla in standing, sedated, non-pregnant mares. A diode laser will be used to seal the opening between the oviduct and each uterine horn, thus preventing subsequent fertilization. The proposed procedures do not involve major surgery, are expected to have minimal complications while approaching 100% effectiveness, and when applied, are expected to result in a static to decreasing population level. Additionally, tubal ligation is a technique commonly performed in humans. The development of an acceptable sterilization technique will help control the population levels of wild horses and burros.

2. Tubo-ovarian ligation via colpotomy as a method for sterilization in mares

Recipient: University of Kentucky
Summary: A two-year experiment to develop different surgical approaches for tubal ligation in mares.
Details: The overall goal of this experiment is to develop methodology for the safe, economical and effective sterilizationof mares via colpotomy (vaginal incision) to achieve: 1) ovarian necrosis / atrophy via application of a ligature to the ovarian pedicle and 2) simultaneous sterilization via tubal ligation (i.e., tubo-ovarian ligation). The project will help determine the effectiveness of a custom-designed instrument for placement of a polyamide (nylon) cable tie around the ovarian pedicle and oviduct of mares via colpotomy for tubo-ovarian ligation. The procedure, conducted in the standing animal under sedation and local anesthesia, is expected to induce permanent sterilization of treated mares. The researchers will assess any post-operative complications of the procedure in mares and the effects on the health of mares to determine long-term effects on the reproductive tract, the overall health of mares and the fertility of mares undergoing the procedure, and the feasibility of these procedures in pregnant mares.

PM Sick Filly PVC March 25 2014
3. Functional assessment of ovariectomy (spaying) via colpotomy of wild mares as an acceptable method of contraception and wild horse population control

Recipient: Oregon State University
Summary: A six-month experiment that will determine whether an existing accepted surgical sterilization procedure commonly used for domestic mares can be safely conducted on wild horses.
Details: This experiment proposes to conduct a large-scope investigation of the safety and practicality of spaying mares as a tool for wild horse population control. Specifically, the researchers will help determine whether ovariectomy via vaginal colpotomy can be safely and effectively performed on wild mares that have been selected for non-breeding status. Non-breeding horses could then be returned to the range to live out their natural lives without individually contributing to population growth. The proposed research effort is based on recent pilot studies that have suggested the potential for surgery-related health complications from ovariectomy in adult female horses is low (near 1%). When evaluating options for field techniques, spaying (ovariectomizing) mares as a population control method is not recommended unless it can be performed in a safe, practical, and effective manner. The results of this study will provide standardized, baseline outcomes for this surgical procedure which can be directly compared to other less invasive procedures being conducted and evaluated by the same research team.

PM WC11 Lucky 11 Map

Map of Western United States showing 12 current field research/pilot projects.

4. Re-immunization of Free-Ranging Horses with GonaCon Immunological Vaccine: Effects on Reproduction, Safety, and Population Performance

Recipient: Colorado State University
Summary: A two-year experiment will focus on further study of Gonocon, an approved and labeled contraceptive vaccine for equids.

PM PZP Injection
Details: This experiment will focus on the effectiveness of GonaCon as an immunological vaccine, with five objectives: 1) to begin to determine the optimum and most effective re-vaccination schedule with GonaCon vaccine for suppressing reproductive rates in free-ranging horses, the duration of effectiveness, and the return to fertility following treatment; 2) to determine the safety and physiological side-effects (if any) in feral horses following re-vaccination with GonaCon including visual assessment of general health, body condition, injection site reactions, effects on current pregnancy, and neonatal health and survival; 3) to determine the effects of GonaCon vaccination on the behavioral side-effects (if any) in free-ranging horses including quantitative assessment of the effects on daily activity patterns and social interactions; 4) to develop and test a safe and effective dart configuration and injection system for remotely administering GonaCon vaccine to free-ranging horses by means of a syringe dart; and 5) to develop a Bayesian model to forecast the consequences of different GonaCon vaccine treatments on feral horse population dynamics at THRO. [Teddy Roosevelt National Park].

5. The Effect of Immunization against Oocyte Specific Growth Factors in Mares

Recipient: Colorado State University
Summary: A two-year experiment to develop a new, permanent contraceptive vaccine for wild horse mares.
Details: This experiment will focus on vaccination against two key proteins in wild horse and burro females, either alone or in combination, which may result in permanent sterility through premature oocyte depletion. The depletion of oocytes may occur by simply causing them all to become atretic prematurely and/or accelerating the process so that after a single season the mares and jennies have depleted their oocyte reserves. To test this hypothesis, the researchers will vaccinate mares against the proteins and track their sexual behavior, follicular growth, hormonal profile and ultimately total oocyte count over a two-year period. The long-term goal is to develop a vaccine that can cause permanent sterility after a single dose.

PM Burros Wild 2 © Carl Mrozek

Cruel way to drag foal by pulling bailing twine around their neck (Photo © Bo Rodriguez)

Cruel way to drag foal by pulling bailing twine around their neck (Photo © Bo Rodriguez)

6. Electrospun delivery to enhance the effectiveness of immunocontraception strategies in equids

Recipient: Ohio State University
Summary: A four-year experiment that will attempt to develop a new delivery vehicle for porcine zona pellucida (PZP) – a temporary contraceptive currently used in some wild horse herds – that would increase the duration of the vaccine’s effectiveness.
Details: To reduce population on public lands, horse immunocontraception has largely focused on the use of PZP in free-roaming wild populations. The vaccine appears to act by stimulating anti-PZP antibodies that bind to the surface of the ovulated egg, preventing sperm attachment. While performance has been satisfactory, recent results have been associated with contraceptive efficiencies that are considerably less than 100%. The basis for this is unknown but is believed to be in part caused by delivery methods that require substantial heating during polymer vehicle fabrication, expose PZP to enzymatic fluids prior to entry into the bloodstream and allow gradual – not burst – release. Gradual release can potentially desensitize the immune system to the presence of PZP, resulting in inferior production of anti-PZP antibodies. Thus, an ideal delivery method would allow release of PZP in “bursts” at pre-determined intervals to assure constant immune stimulation. This project will seek to develop an electrospun technology that can allow long-term, ‘burst’ delivery of porcine zona pellucida (PZP) vaccines to the intramuscular environment of horses and burros to result in prolonged suppression of reproduction. For large-scale application, free roaming horses could be gathered in the field and processed through stock chutes for aging, at which time the implants will be inserted by trocar. The experiment will also carry out parallel in vitro and in vivo experiments to examine the potential of electrospun vehicles as immunocontraceptive carriers. An electrospun “universal delivery vehicle” will be developed to provide sustained release of effective levels of porcine zona pellucida (PZP) for immunocontraception over periods of at least three years. By careful design, fabrication and testing of two different electrospun designs, the researchers will create a comprehensive evaluation of this novel method of delivery.

Pm PZP Darts
7. The use of membrane disrupting peptide / peptoid LHRH conjugates to control wild horse and burro populations

Recipient: Louisiana State University
Summary: A three-year experiment for the development of an injectable agent that would inactivate hormones and decrease female and male gonad viability.
Details: The experiment is a multidisciplinary effort aimed at developing novel drugs to control wild horse and burro populations. Several types of drugs consisting of conjugates of membrane disrupting peptides (such as Phor 21) with luteinizing hormone releasing hormone (LHRH) currently exist. These drugs (such as LHRH-Phor 21 conjugate) effectively target, bind to and destroy prostate, testicular, breast and ovarian cancer cells, as well as testicular and ovarian cells that control reproduction. LHRH targets the cell and delivers Phor 21 to the cancer cell or the reproductive cell in the testes or ovary and destroys it. Preliminary experiments suggest that administration of this drug by a slow-release delivery system will destroy the cells that control spermatogenesis in the male and follicle growth, oocyte development, ovulation and cyclicity in the female. Preliminaryresults also show that LHRH-Phor 21 targets and destroys gonadotropic cells in the pituitary gland. This indicates that cessation of reproductive activity is the result of both central control at the level of the pituitary gland and on receptor binding cells in both male and female gonads. The experiment will also assess the effect the drugs have on pregnant mares, both in early gestation and late gestation.

PM PZP Syringe Yearling Meme

Additional details about these experiments can be found in the following documents:

Detailed Summary of University-led Experiments for Fertility Control Tools for Wild Horses
Review of Proposals to the BLM on Wild Horse and Burro Sterilization or Contraception: A Letter Report
Research with the U.S. Geological Survey

Through its partnership with U.S. Geological Survey (USGS), the BLM is undertaking important research aimed at delivering better methods and tools for managing wild horse and burro herds on public lands. These projects build upon on-going cooperation between the BLM and USGS that is implementing new methods to estimate wild horse and burro population size.

There are nine USGS experiments that have been approved or are on-going:
Collaring & radio marking (1 year): The aim is to develop safe GPS collars for tracking animals to determine habitat selection, movement ecology, population estimation, behavior, etc. GPS tracking might also help locating animals for contraceptive treatments.
Fecal DNA (genetics/population survey) (1.5 years): The experiment involves the collection and analysis of fecal DNA as a noninvasive method to determine genetic diversity and estimate population size.
Carrying capacity modeling (1 year): This experiment’s aim is to develop a coarse model to evaluate changes in animal carrying capacity in response to changes in vegetation production. The resulting model may help BLM to adapt plans in response to climatic change.

PM PZP Syringe FB
Mare Contraception -SpayVac Pen Trial II (5 years): This experiment will help determine the efficacy of alternative SpayVac contraceptive vaccine formulations that are potentially longer acting than conventional PZP vaccines.
Evaluating Behavior of Spayed Free-Roaming Mares (4 years): The experiment will determine the effects of spaying on behavior, interactions, and movement of spayed mares among a breeding herd. The study will also determine the population level effect on herd growth.
Evaluating Behavior of Geldings among a Breeding Herd (4 years): This experiment will determine any effects of gelding on behavior, movement, interactions and changes in habitat selection.
Two Sentinel Horse Herd Management Area (HMA) Demography Studies (2 studies, each of 5 years): These experiments will provide demographic data sets for use in new population models and serve as control HMAs for gelding and spayed mare field studies.
Burro Sentinel HMA Demography Study (5 years): The experiment will involve collecting data on the survival, fertility, fecundity, recruitment, movements, range use, habitat selection and social behavior of wild burros. These data will be used in population modeling.
The BLM has requested or is reviewing proposals for the following projects with USGS:
Evaluate the Use of a Silastic O-Ring Intrauterine Device (IUD) in Mares (4 years): This experiment will determine any effects on mare health resulting from the long-term presence of the silastic O-ring IUD. This IUD has effectively prevented pregnancy in domestic mares during one breeding season.
Burro Population Survey Method Development (2.5 years): This experiment will test two new population survey methods for wild burros. The existing simultaneous double-observer method, when applied to burros, tends to lead to underestimates of true burro population size.
WinEquus II – Population Model with Cost/Benefit Outputs (1.5 years): This experiment will develop a model that compares population modeling outcomes and projects the costs, benefits and expected population growth resulting from management actions that involve PZP, removals, spaying, gelding and other population growth suppression tools.
Testing Efficacy of Contraceptives for Female Burros (3-4 years): Contraceptive vaccines have yet to be used on wild burros due to limited research and unknown effects. This study will examine the efficacy of various existing vaccines.

PM Hazard Foter Public domain Marked Sterilize

© Protect Mustangs, 2016

PZP Pushers are misleading the public as there is no evidence of overpopulation

PM PZP Auto-immune disease

PZP = Slow Extinction

While touted as a “vaccine,” porcine zona pellucida — PZP — is actually a perversion of a vaccine — an anti-vaccine — whose mode-of-action is to cause auto-immune disease. PZP tricks the immune system into producing antibodies that attack the ovaries, inducing ovarian dystrophy, oophoritis (inflammation of the ovaries), and ovarian cysts. Worse yet, per radioimmunoassay, the PZP antibodies are transferred from mother to young via the placenta and milk. The antibodies cross-react with and bind to the zonae pellucidae of female offspring. Although hyped as a “non-hormonal” method of birth-control, PZP causes estrogen-levels to plummet as the ovaries degenerate. Despite the manufacturer’s claim that PZP is “reversible,” its effects wear off unpredictably. In herds under PZP “management,” the birthing season extends to nearly year-round, putting the life of the foals and mares at risk. Because PZP messes with the immune system, it “works” best on the healthiest fillies and mares — those with strong immunity — ironically, rendering them sterile even with just a few treatments. Filles injected with PZP before they have reached puberty are particularly vulnerable to immediate sterilization. Conversely, PZP has little-to-no effect on fillies and mares with a weak immune system — they continue to become pregnant. Thus, a herd being treated with PZP is undergoing selective breeding for low immunity, which puts the population at risk for disease — and ultimately, extinction. ~Marybeth Devlin, member of The Facebook Forum on PZP for Wild Horses and Burros.

PZP = Slow Extinction

Despite protests, BLM returns wild horses to range in Nevada

Fish Creek Mares Indian Lakes aka Broken Arrow 2015

April 12, 2015

RENO, Nev. (AP) — Despite the protests of a rural county and rancher, the U.S. Bureau of Land Management has returned some 160 wild horses to the range in central Nevada.

The agency returned the horses to the Fish Creek Herd Management Area near Eureka on Tuesday after being cleared to do so by the Interior Board of Land Appeals.

The BLM originally had planned to return some 100 mares treated with a fertility control vaccine and 80 studs to the HMA on Feb. 20. They were among 424 horses removed from the HMA during a roundup that ended earlier in February.

The bureau routinely thins what it calls overpopulated herds on public land across the West, sending horses that aren’t adopted by the public to pastures in the Midwest for the rest of their lives.

The agency also routinely releases mares treated with fertility control drugs back to the range after being rounded up. Varying numbers of studs also are released back to the range to help maintain the genetic viability of herds.

Eureka County commissioners and rancher Kevin Borba filed an appeal with the Interior Board of Land Appeals to block the return of any of the 424 horses to the range and to challenge the BLM’s assessment of how many horses the HMA can support.

But the board affirmed the BLM’s authority to return 162 of the horses to the range. Arguments in the case continue on the underlying claims.

Borba has said the BLM has drastically reduced his livestock allotments in the HMA while allowing well over twice as many horses in it as it can support. He and Eureka commissioners seek the removal of more horses.

Horse advocates praised the BLM’s return of the horses to the range, saying it’s in line with recommendations released in 2013 by a National Academy of Sciences panel calling for increased emphasis on fertility control to keep horse numbers down.

“Now is the time to move forward with innovative management that makes sense, keeping wild horses on their range and saving millions of tax dollars in the long term,” Neda DeMayo, president of Return to Freedom, said in a statement. “It is time for a new direction instead of wasting time and money obstructing positive solutions that will benefit the horses, wildlife, ranchers and the range.”

But not all horse advocacy groups support the use of fertility control drugs on mares.

“We want to see drug-free holistic management used for native wild horses,” said Anne Novak, executive director of Protect Mustangs. “(The fertility control vaccine) PZP sterilizes after multiple use and we’re concerned that will ruin survival of the fittest.”

Borba has said he thinks the fertility control vaccine is far less effective than the BLM and horse advocates claim, and horse numbers will further explode as a result. Ranchers view wild horses as competition for scare forage in the arid West.

Cross-posted for educational purposes only from the San Francisco Chronicle.

Wild Horse and Burro Advisory Board Meeting Sept 9, 2013 Arlington. VA

OBAMA ~ Mustang poster © Lise Stampfli 2009

OBAMA ~ Mustang poster © Lise Stampfli 2009

Cross-posted from Hippies 4 Horses by Afroditi Katsikis

This is the text of the meeting of the Wild Horse and Burro Advisory Board meeting held on September 9, 2013 in Arlington, Virginia. This text was copied directly from the captioned text of the live-streaming meeting– no edits or corrections – only some spacing to make it easier to read. I can not assure you that it is complete as per the meeting – it is as complete as the captioning was on live streaming.]

[Joan Gullifoyle starts the meeting]
>> Okay, hi, everybody. We’re going to get started in two minutes. So, if you would take your seats and finish up your conferences. I can’t couldn’t see because I can’t see that side of the room. But Carol Lanne of the National Research Council National Academy of Sciences is here and she was very involved in the coordination of this report. I wonder if she would take a moment to explain in digs to the 11 questions that the BLM asked of the NAS, what the — what the report did and didn’t cover intensely just to help it be more clear why some things may be in and some things may not be in and what you’re leaving it to us to kind of do with the report if you wouldn’t mind.

>> Sure. Thank you, again for making the report your focus of this meeting. My name is Cara. I’m the study director for this particular project. And I’m a program officer at the National Research Council.
As you’ll find had your report on page 2 and 3 in the summary and then again on page 16 and 17, that’s a statement of tasks that the BLM and NAS agreed that the committee would look at.

Following that there’s a section in the report called bounds of the study which goes through what we were asked to look at and what we weren’t asked to look at. As you’re all aware there are many issues that are not related to science but national research committees are commissioned to look at science-based questions so that lends itself to the nature of the questions that are part of the statement of task which have to do with population estimates, range land estimates. Population growth. Genetic diversity population control. Things outside the bounds of science supp as how many animals should be on the range — because that’s a policy question, not a science question. Forage can tell you how much forage, how animals may use the forage, how different animals may use the forage but how many animals you’re going to have out there and what kind of animals they’re going to — for instance livestock and wildlife or some of all. That’s a question for policy makessers to make. So the purpose of the report in answering the science question is they can inform the policy conditions. That’s the role of BLM. Not the committee.

>> And Kara, if you don’t mind just for clarification, what BLM asked the NAS to do was look at these 11 questions about the science of the animals on the range. But not to look at perhaps the multi use nature of the rest of the agency for example. Is that right?

>> KARA LANEY: Yes, things like whether the law could be changed, whether different laws perhaps conflict with the Wild Horse and Burro should be changed, whether the allocations can be changed. Those are policy conditions that the policy was not asked to look for?

>> JOAN GUILFOYLE: And the logistical political educations that were asked for that were science based you’re leaving up it up to the receiving agency to determine the feasibility of some of it.

>> KARA: Correct. So the budget associated with recommended actions was not part of the committee’s purview. As you’ll note in the report, we do find that — we do go so far as to say an option will be expensive such as continuing to move horses to long-term holding will be expensive and the committee thought that its recommendations would be less expensive in the long run. You about we don’t go through and put a financial — attach a number to those actions or to the actions of gathering animals, implementing fertility control, anything of that nature.

>> JOAN GUILFOYLE: Boyd, just one more thing if I could add. The NAS, if I can say for Kara just for a moment, was concerned just as we were that there were a lot of interpretations about the report immediately after it was filed and to look at how we could correct that or they would correct that. They did do a posting on the Web site and I don’t know if you’re going to be here, Kara but I’d like that to be part of what we share with everybody.

>> Sure, I plan to be here the whole time.

>> JOAN GUILFOYLE: So we can go over that briefly now or wait until public comment period or Wednesday morning. It doesn’t matter. But I want to make sure that you all hear what they felt the media had misunderstood about the report and to be clear about what they said.

>> DR. BOYD SPRATLING: Kara, just so you know, we’re going to take latitude as a board to ask questions while we have experts in the room. We fully understand that a lot of the questions we ask were not part of the boundaries of the study and report. While we have people here that understand the dynamics out here, we’d like to ask questions to help us from our recommendations to the BLM.

>> Please make use of our expertise, they’re helpful to us and I hope they’ll be helpful to you, too.

>> DR. BOYD SPRATLING: Thank you. Next I’d like to introduce Dr. Robert Garrott. He’s a faculty member of the Department of Ecology at Montana State University.

>> ROBERT GARROTT: Thatch. I have two back to back talks one dealing wees mated population size and growth rates and then I’ll give another one on chapter 6 as well.
So as everybody can imagine, how many horse there are out there and how fast they grow is basic fundamental actions for the problem might take. So our job in this chapter was to look at those things and the objectives within that chapter was to review the the method used to inventory horses by the BLM and provide potential recommendations for improving the methods. And thirdly to review the data available to estimate growth rates. Typical growth rates of course on western range lands.

BLM spends about 1% of the wild horse and burro budget. Inventories horses, Marx sure the animals are accounted, HMA herd management area periodically and those counts are then used as your foundational knowledge for population management. Key attributes of any scientifically rigorous are good survey method. Scientific standpoint is that the methodologies be rigorous and standardized, that there be a statistical basis for how that’s done. That they’re consistently applied, they’re well documented and that the data that comes from these are complete, organized, and accessible. So that’s sort of the gold standard for what we’re looking for in a scientific inventory program for wildlife.

Our expectations before we actually looked at any of the BLM databased on our understanding of how the numbers will be generated and this partly comes from my experience in the 1980s when I worked on this issue by population dynamics of horses and potential of contraceptive control on horses in the 1980s and I worked with all the BLM offices was that there be a periodic count. So someone from the Bureau of Land Management most most likely wind up in a helicopter or airplane and flew through the herd management area and counted all the horses they could see. That count could be reported as a population estimate which you see this column here in this fictitious table that’s empty right now or that count could be modified to come up with a population estimate. If you think you counted them all, in other words, you had a perfect census of the heard management area, you just translate the number you counted into that population estimate.

But in general what we do know about counting large mammals and many, many places is that we don’t count them all. There’s a bias, what proportion you counted can be use if you have an estimate of that or even ball park figure, you can take and modify your count for the proportion you think you actually counted or the proportion you missed and come up with a population estimate. For example if we couldn’ted 422 animals and we thought we counted 80% of them, if you divided 422 by .8, you getten an estimate of 527 animals on that heard management area you’ve accounted for approximating what you think you might have missed.

But we also know that we don’t have the budget or the agency doesn’t have the budgets to count these populations every year. So, if you need a population every year. And you’re not going to count those years and you have some way of projecting that population from one year when you did do the count to the next years when you don’t do a count. And in general the expectation is you’re going to multiply your population estimate in one year by what you think is a growth rate of that population over the next year.

New England this case, this example, if think that the population is growing at 20% annually, we multiply 527 by 1.2 and we get an estimate the next year. And next year, 2003, there’s no count, you do the same thing again. Get a pop ration estimate. 2004, you get a count. You do whatever you’re going to do to that count to turn that into a population estimate and that’s — with the expectation of what was being done with the Bureau of Land Management. Then of course for national statistics if you do that for herd management areas every year and you aggregate population estimates for haul the herd management area, you get statistic how many horses you think are on the western range land throughout the west. So that was our expectation.

And to see if that’s what was actually being done, the NRC committee requested the BLM provide us records from 2000 to 2011 for all herd management area. The BLM was –’s response was that there was no — excuse me. No centralized database. The data was first among field office thought that request wasn’t manageable for what they asked it to do, they thought what would be more manageable would be if we requested records from agencies and suggested a maximum of 40.

And so what we did is the committee selected the 40. HMAs that requested data for and these are the distributions of the sample of HMAs that we received data from BLM versus the number of HMAs based on criteria that were available to be sampled. So we got records from 40HMAs represented there across those states based on the sample we requested.

And this is an example of what we got back. We provided BLM the national office a standardized table so we could get the data back in the same way. And I’m going to spend a little bit of time with this to point out some attributes of this. So this — I’d say, is a typical record for one of the herds we saw. And you request see that there’s attributes across the columns and there’s data filled in and there’s places where there aren’t any data. So those are the actual population counts. And the first thing you can see is that they’re irregular as far as when they were conducted. So sometimes we had two counts. Back to back and other times we had a year in between and sometimes in this case, a couple years in between. So there’s some inconsistency on how frequently this herd counted.

There’s a real inconsistency on when they were counted. And this is important because there’s a birth pulse where the population increases because of foaling and then throughout the rest of the year, there’s attrition, animals are being lost. If you count the animals at different times, you’re counting for a different amount of the seasonal mortality that occurs. And it makes the data less comparable from year-to-year.

So there’s inconsistency in these records in timing of surveys. And here you can see that there’s inconsistencies when the survey platform. Usually a helicopter was used. And then one year a fixed wing airplane was used probably because of logistics or perhaps budget. Fixed wings are much cheaper than helicopters. But the proportion of animals you can detect different survey platforms to be very different. So by changing your survey platforms from year-to-year, you’re probably adding additional variability to the count data that has nothing to do with what the population is doing. It’s due to your changes in the methodology you’re using to count them.

You can also see here that there’s also incomplete counts. Here’s that year that the fixed wing was used, only 70% of the area was surveyed. So that that adds a little bit of problem to interpreting those data as well. Now, if you look at the relationship between the population count and the reported population estimate. You see there’s a difference in this. There’s a first record. 190 were counted but population estimate was 164. You look over there at the last column on the right, the adjustment to the count was filled in as none.

But it — but the numbers are reported as being different. We’re not quite sure why those numbers were different there could be many reasons but we don’t know why. If we go down this column and look at how that number changed between counts and the population estimate each year, you see this year, the population estimate was a little lower than the count. Next time that incomplete count was 60, for some reason it was a really low count. But the population estimate — next year the population estimate was exactly the same. The next year it was counted, a little bit higher than the count. Population estimate was a bit lower. Next year is much lower. Next year little bit lower. Next year could be accounted for if there’s removal between population count and population estimate and that was accounted for.

We also had data on all the removals so we had the ability to cross reference these data to see if some of the discrepancies especially if they’re lower, sometimes that was the case. And then you had the years that there were no counts and the population was projected for those years as well. And we could find real consistencies if we adjusted the math just to see if there was a multiplier effect for population growth rate. If there was, it was very inconsistent from one projection to the next on the years that there weren’t counts. Here’s a different record that recommends another HMA that represents the best record we had at the 40. You can see that everything is consistent. Consistent use of both vehicles and horses. So these are ground counts, consistent time of the year, area was completely covered. Population counts were believed to be a census and they were always reported as population estimate.

Herd happens to be one that the USGS was conducting research project on supported by the BLM and so this might be a reflection of a research activity this herd is very much like the prior herd where the horses are all known individually by color patterns, there’s a lot of people to keep track of every horse. So this is an example of a small isolated herd. This would be represented of the horse record we received where there’s very little data filled in. There’s wide gaps, inconsistency where they’re counted and no population estimates filled in at all. We can just assume that the count was projected as population estimates since nothing else was provided in this table.

This gives you a representation of the types of data we received from the Bureau of Land Management from their inventory program. The other type of data you get is aggregated data which is reported on the BLM Web site that gives you an idea of the — excuse me, trajectory of the population range wide population throughout the west. Each of the data that have been reported on the Web site. This is important because it’s interpreted by public administrators. Gauge success of the program. It’s used in formal government review programs from the government accounting office reviews. And foundational data for planning and budge teary decisions that go to the Congress as well.

Given some of the data we saw in the field offices we weren’t quite sure of the national number. We started a conversation with Bureau of Land Management national office asking for an explanation how those national statistics came about. We were provided no documentation linking the national statistic to the field office. We compared the field office data from the sample of 40 HMAs and looked at what was reported on the Web site for those HMAs that were aggregate for national statistic. So Web site reports the sum but it also reports the number of population estimate for each HMA. I’m sorry, I had surgery just a little while ago on my throat.

And so when we did that, we found quite a few discrepancies between the field office data provided to us in given years and what was reported on the Web site. And we received no explanation of those discrepancies. So we just link — we can’t adequately link the field data to the national statistics.
So the committee conclusion regarding quite a few methodological flaws, inconsistent methods. It was also noted very often and with the public gave us testimony about movement of horses among HMAs. Which can confound at the HMA level that horsees are freely moving back and forth and adds variability to interpreting data. These are just straight counts.

Go up in a plane or helicopter and count all the ap malls you can see. So there’s no it at that time tickal method so there’s no proportion of animals detected which can be very substantial. The proportion that are missed. That’s giving a statistical range in what’s a plausible value given the data you collected and certainly inadequate recordkeeping and database management.

So we concluded that BLMs current herd inventory procedures don’t meet the modern standards management applied for most other systems where we’re required to inventory populations that we manage. Given how the data were collected and reported, we we concluded that the population estimates that are provided are likely substantial underestimates simply because we know we don’t count them all when we go up there and there wasn’t in most prop Asian estimates counts weren’t reported directly and if you didn’t count them all, it would suggest that the population estimates that are reported are underestimates of the number of animals actually on the range.

We also noted that this is the exact same conclusions that were made 30 years ago by the NRC committee that was in place when I was doing my Ph.D. in the 1980s and so this has been and this seems to not have changed since the program began. We also noticed there are attempts to improve the inventory program.

2010 wild horse burr and burro management handbook is published a rigorous set of guidelines for survey techniques and these are an excellent set of guidelines that mimics what I dictated as what would be ideal attributes there at the beginning of my presentation. They’ve also been working hard to aggregate HMAs where there’s a believe that horses are freely moving among HMAs and to essentially come up with more reasonable biological units to conduct surveys over which are called HMA complexes. So, if there’s no fences or fences are permeable between heard management areas, aggregate them together. Census and manage that as one population so it’s more interpretable data. That’s an improvement or could be an improvement if it it’s implemented.

And finally, BLM has had a partnership with USGS for about a decade to develop and test statistic rigorous survey methods. There’s a lot to be had from that 10 years as far as developing methodologies and horses can be counted well and scientifically rigorous. You can estimate detection probabilities and do a better job in that decade of collaboration certainly gives us some good science.

So our recommendations for improving population monitoring is that those two things that have been initiated, those guidelines from the 2010 handbook and the HMA complex initiative that those things actually be implemented well and consistently across west and evaluated on a routine basis. We also suggest that BLM should consider more intensive monitoring for what we call sentinel herds. So I’ll relate a little bit more to sentinel herds and why this is important, why we think this might be important in the presentation on the next chapter. But this is the idea that on some of your heards, a sample of your heards throughout the west that represent a diversity of ecological settings where BLM manages horses, that survey and inventory work should be done almost an annual basis in order to better understand population of horses.

We recognize there’s a budge teary constraint that’s firing that most HMAs only be inventories every two, three, four years, but in order to get the foundational knowledge like population dynamics, at least a sample should be monitored relatively routinely. Probably annually, to provide good data that can then feed into population management decisions and models that I’ll talk about.

We also recommend improved recordkeeping and development of a standardized and comprehensive database. And that all of this, inventory procedures. And data be made readily available to the public. We heard from a lot of public constituents that they don’t trust the numbers, don’t know where they come from and we think that that causes a lot of mistrust between many public groups that are concerned horse and burro management and the agency that’s responsible for the management.

Dealing with the second subject, population growth rates, our work primarily was limited to looking into literature review because there hasn’t been a lot of data available to estimate growth rates. So we looked at the papers that were published in the literature to estimate growth rates. We did conduct one novel analysis that provides additional insight and we looked at the age structure of about 168,000 horses that had been removed from public lands in the west. To try to get additional insight.

Essentially what we did is for each year, those horses are all age removed, that’s a lot of horses each year. So what we could develop is a young of the year to adult ratio is. And this is what those data look like. So this is sort of a moving window average of the young of the year versus an adult ratio for the horses removed from the range each year.

And you can see that generally between 20 and 25 young of the year say per hundred hundred adult horses so this is an index of population growth rate using those age data. We know that would be biased to growth rates because horses are moved to the range in order for t for it to be indicative of the actual growth rate, all the horses would have to be removed before the birth pulse. You had all the an halls that were going to die for the rest of the year up to the next birth pulse and I’ded y’allly that’s when you’d use these ratios since they’re throughout many more months, it’s providing a bit of an overestimate of population growth rate. But you can see where those numbers lie. 0 so our conclusion is while growth rates certainly virginiay from one herd to the next and within a heard — vary from one herd to the next both the population and age structure data from the horses removed is consistent with the idea that typical growth rates are probably in order of 15-20% annually. What’s that mean?

This is a graphic, a table, BLM estimates that there are 3,000 horses on public range lands in the west this year. If we want to project the number, say horses aren’t managed based on the growth rate you multiply that 33,000 by 1.2. And these are the numbers you get from that. So 20% growth rate would lead to a population doubling every four years if they weren’t actively managed and contribute willing in six years.

If you look at the same data for 15% population growth rate, if left unmanaged, horses would do you believe every five years. And triple — do you believe every five years and triple every 8 years until they became food and water limited like we heard about from Mike in a previous presentation. But that growth would probably go for quite a while when we start seeing that food and water limitation throughout the west.

So what’s that mean, these sort of numbers mean as far as BLM’s real dilemma and that is trying to manage the annual increment of horses so the population gets stabilized. So, if you multiply, this would be the annual increments for that 33,000 horses on the range that would accrue over one year, this current population if the populations were growing at 15 and 20% annually. You can see 6600 horses would be added to the population I’ll point out that for 10 years BLM has been removing an average of 8700 horses a year from the western range lands. Considerably higher than that annual increment at 20%.

And the national statistics would suggest that the population over that 10 years is approximately about the same. If the population is growing at 30% the BLM could remove an average of 8600 horses, I think that’s additional evidence that there’s more horses out there than the reported number. And it also provides evidence that these growth rates are realistic given that the off take of horses and the removal program.

So what would that mean if we looked at that annual increment at the different population levels. This would be the number of horses that those different population leveled. You’d have to remove from the range land just to keep the population in any one of those years stable. We know we can only adopt anywhere between 2 to 4,000 maximum. That’s the problem. And so you can see that there’s two things that are going to affect the annual increment that has to be removed. The annual population growth rate and the number of horses you have on the range.

So, if the ultimate goal would be horse management in the west is to only have to remove the horses that you can readily adopt 0 so you can get rid of long-term and even short-term folding facilities, you have to get the annual increment down to between 2 and 4,000 horses and there’s only two mechanisms to do that. And that would be to reduce the population growth rate which we have the NRC committee recommended at least three or four different fertility intervention technologies that could be used and/or you’d have to limit the number of horses on the range so that base population that that growth rate is acting on can meet those management objectives of 204,000 horses to be adopted. — 2-to 4,000 horses.

So in summary, we think the horse inventory procedures are not scientifically rigorous. That improvements to those inventory procedures have been initiated but we don’t know the extent to which actually been manipulated. Our implemented, excuse me. And whether or not that’s range wide throughout the west or not.

We definitely think that recordkeeping and database management has to be substantially improved. There’s no clear linkage between the national statistics and field offices or at least it wasn’t demonstrated to the committee. I’m sure there is a linkage but we don’t know what that is or we we couldn’t cover that and horse populations are growing at 15-20% annually. And with that, entertain questions if we have time.

>> Thank you very much for that presentation. Do we have any questions from the board. (off mic).

>> Have you done — in looking at nonlethal methods of slowing the growth rate, have — with what — what you’ve learned so far, do you feel that there is an opportunity to zero the growth rate based on the current population sizes?

>> ROBERT GARROTT: So the question — I don’t think the mic was working the question is do we think there’s a possibility to stabilize the populations using only –

>> Correct with the current based population?

>> ROBERT GARROTT: That wasn’t part of the charge of the NRC committee. I can tell you that there are a fair number of papers that were population models using horse data have been built and then what might be considered realistic fertility interventions with the tools available today and what might be viewed adds realistic treatment levels have been applied and in general, those modeling experiments would suggest that fertility control can help rethe growth rate but it will probably be very — reduce the growth rate but it will probably be difficult to stabilize the population useility control alone.

The fertility control is dependent on the number of the horses, the population of the population that can be treated. You can’t tread them all or if they do, it can be very expensive or difficult. And so it can help the problem but fertility control at least in the current forms we have probably are not going to — is not going to be able to essentially stabilize the population at whatever level.

So it can help. It can help substantially.

>> One of the tools that can be used.

>> ROBERT GARROTT: One of the tools, yes.

>> Thank you, again, appreciate that information and well-presented. I’ve got a couple of questions. So back to the estimating of the population size. And where you weren’t, I have my note here, did you question the local offices. So my understanding is you had to go to the local offices to get the data that you did for each one of those 40, is that correct?

>> ROBERT GARROTT: Not quite. The NRC communicated only with the folks at the national office. So the national — when we requested the data from the national office, the larger data request, the national office asked us if we would make a more modest request. We made a request to the national office. And I think they made a request to the field offices and then the data came through back to us through the national office. We didn’t have communications with the field offices directly.

>> All right. Thank you for that clarification. So off you’ve not had the opportunity to have the conversations with the local staff at all in any of the BLM offices?

>> ROBERT GARROTT: Not as part of the NRC committee.

>> Okay. .

>> On the new ways of counting that have been put in the policy book, there’s two, I can’t remember what they’re called. The handbook, yes. My question is are you familiar or have you seen them be what I guess I would refer to as ground troops or are they just models? I guess what I mean by that is for instance in the little book cliff because we do know how many horse there by name and picture. Have we flown that and done this process to verify that we are accurate?

>> That was one of the areas that USGS worked in. That they did do one of those survey methods which is called more creek capture where essentially that — every animal’s ID’d by his particular colors and patterns. They’re all individually marked. They’re intensively surveyed and known you actually very seldom do actually know the truth. So they use this herd because they did know the truth and then they applied a March creek capture technique where they didn’t use the known identities of those horses but you fly once and you photograph bands of horses and you essentially mark those bands you saw by the coat colors of that aggregation of horses.

Then you go out and do a second flight and now you’re considering those groups being marked groups, you know them. You saw them in the first light. And you go out a second time and you fly and you see unique groups that you saw the second time that you didn’t see the first time. You see the proportion of the marked groups that you saw in the first slide. And that can — stat thickly adjusted — statistically adjusted to allow you to estimate for the proportion missed.

So essentially you have your first flight identifies animals you know are out there. Groups you know are out there. Second time you don’t see them all and you see new ones so that provides you a way of estimating the proportion missed where you don’t have to know all the horses from the ground so you can do this on a — on a herd where you don’t have those individual IDs for all the animals. It does require, though, it’s hard to believe that this technique would be used for population these horses. It’s a methodology used for relatively small eyes isolated population where it’s realistic to do that and it take quite a bit of manpower to go through those photographs and identify them all. So what USGS did is identified a suite of techniques and they evaluate several more that didn’t work out very well.

And it would be that you’re not going to use — you probably wouldn’t be using this same methodology for every herd management unit. You have a suite of scientifically rigorous methods that were matched to the ecological conditions and the survey conditions on the various ranges.

>> Thank you.


>> Dr. Bray: Dr. Garrott? Robert Bray. Clearly you and your colleagues on the committee have provided a comprehensive review of the literature so thank you very much for that. You reference that the field data was — could not be linked to the national statistics that were imported. Was there any pattern in those differences, less, more, highly variable. Any numbers to say they were consistently X percentage? Differences.

>> The only thing we’d have there is the population estimates reported for the 40 — the sample 400 HMAs that we were given and compare that against what was on the Web site for those herd management units. And for those where we had the field population — field office population estimates and we could compare with what was on the national Web site there was no consistency. Less or more?

>> I would also offer that of those 40 HMAs, I think something — I have to look back at the report. I can’t quite remember the figure but I think we only had about 50-60% of those population estimates filled in. From the field offices. But there were population estimates filled in in all the national statistic.

>> Was there a subsequent requests when you did not receive one the first time? Did you have a delivery request?

>> ROBERT GARROTT: There was about six months of communications back and forth to try to understand.

>> Dr. Bray: Is there any reason they were ignored or not responded to.

>> ROBERT GARROTT: They were always responded to. We always gout responses and I think that the records of the committee would have all the email responses went back and forth about that except for a couple conference telephone calls that weren’t recorded.

>> And finally with the 40 HMAs that you requested numbers from were they randomly selected or were they identified by the national law office as to what was going to be provided.

>> ROBERT GARROTT: No, the national office didn’t select that. The committee selected that.

>> Was that random or how did you go about making those 40?

>> It was a systematic examine and let me explain that a minute. We took the most recent population estimate for each HHMA, we ordered based on population size, since we could only get 40, we decided we didn’t want to burn up our sample of 40 by getting records for an HMA where there’s only 12 horses or 30 horses, we wanted to have something that represented both a range of horse sizes but but to get the best information we could from those 40. The present population had to be at least 40 or 50 animals. It couldn’t be a mix of burros and horses because we wouldn’t know how to split up that number between those two. So it was only horse only HMAs and then when we had that listing, then we took every third. So — when that list — we got a systematic sample across the range of horse sizes. That took us up to about 336 and then we added 4 in the 80s we he had population data that weren’t on that list that would give us more data that could reflect population growth rates to bring it up to 40 and that’s how it?

>> ROBERT BRAY: And one finally — my voice normally carries so I don’t worry about a microphone.
One final question, when you look at that pattern of differences between field data versus national numbers, can you give me a sense of high and low and how they varied? They were off by 4% or –

>> ROBERT GARROTT: All I can say is sometimes they were right on the money. It was exact same we got in the field office. Sometimes they might minor differences on the order of physician horses but it wasn’t unfrequent, infrequent to have differences of hundreds of horses. And the proportion would depend on the herd. We looked for patterns. We looked for patterns and could not find consistent patterns. So I think the NRC committee report we said we think that the national estimates are based on probably many hundreds of somewhat subjective independent judgments because there were certainly judgments being made at the field offices when they reported population estimates. And there must have been judgments being made at the national office as well after they got the field data.

>> ROBERT BRAY: I probably know the answer to this. But 15-20% foaling rate, do you think that’s a real number?

>> That wouldn’t be the foaling rate, it would be population growth rate.

>> ROBERT BRAY: I’m sorry, do you think that’s a real number.

>> ROBERT GARROTT: I’m not sure what you mean by that.

>> ROBERT BRAY: Do you think it could be substantially higher?

>> ROBERT GARROTT: Probably not. It’s plausible based on the biology of the animals, but probably not much higher. Some of the literature has reported population growth rates up to 28%. And the way that’s.

>> DON: I think in all of those records it’s where you have a good sequence of population counts. Say, 8, 10 counts in consecutive years and you can look at the trend of those counts and estimated a growth rate from that and that particular methodology has generated some estimates of population growth that exceeds 20%, up to about 28% there’s confidence limits on those and that’s when those higher estimates would cover 20%.

>> That model wouldn’t be based on accurate counts of animals.

>> It’s .
>> You how do you define an accurate count if you don’t know truth.

>> You could have some variability in what proportion you count every year but, if you had consistent methodology, and you counted those populations over over a number of years, you could statistically estimate the growth rate even if you don’t know the proportion you counted. And you get a legitimate and scientifically rigorous estimates of growth rate without knowing truth. How many horses are out there or any wildlife in our populations other than those few that are tracked by individual animals and they’re all named and you’ve got 20 people growing up out there that loved him and watch them and keep an eye op them for you?

>> ROBERT BRAY: Thanks again.


>> I’ve got a couple questions on the growth rate, do you have a percentage of it’s interesting, I spent my entire career working, one of the places I work is Yellowstone National Park and there’s more science on the demography of one out population in Yellowstone National Park than this entire species on the western range lands and indeed there’s been very little science done and most of it was done in the late 70s and 80s on population demography, growth rates, foaling rates, serious signs to understand horse vital rates, survival reproduction age first reproduction pregnancy rates.

And so there isn’t much science there and that’s the idea of sent until populations could help us get a little bit more of that. But certainly pregnancy rates at least 50-60% based on — 50-60% pregnancy rates based again on research done way back in the 70s and 80s, where a lot of horses were bred and certainly levels were assayed for horses being removed from the range land and part of a big research project that I was part of there in the 80s. So the foaling rates, the pregnancy rates as much as we can tell in the foaling rates would certainly support the idea that populations could routinely be growing at 20%. (off mic).

>> That would be more valuable than the actual growth rate of the herd I think as far as knowing population growth expression. Am I incorrect in thinking that way?

>> ROBERT GARROTT: So you don’t know which animals are pregnant or which animals are fertile most likely when you’d be treated them. So you’re going to — in a practical standpoint, you’d be treating at least Mary oriented contraception. You could be — wouldn’t be able to carefully target which animals were probably treated. In order to do any effective management with contraception and I’ll touch on that in the next presentation, you certainly have to have — or I would think you’d want to have some model of population dynamics for the horse herd that includes pregnancy rates. As well as foal survival.

>> TIM HARVEY: That’s where I’m going, I’m trying to figure out how many Maries you would optimally treat to get that rate you’re trying to get earlier to achieve the number of growth rate you were talking about that would be sustainable.

>> It would depend on the demography of the herd. So even though our conclusion is that typically herds in the west are growing on average of 15-20%. There are probably herds that are growing much less than that.

>> TIM HARVEY: I’m grasping for is there a number we need to treat 15% of the mares, 40%. The number that gets treated is quite low. So what I’m trying to get my mind around is mares need to be treated 0 on average. Can you comment or can you throw a number out there how many would have to be gathered and treated in order to affect some of the changes that we’re looking to do?

>> ROBERT GARROTT: So effect some — so — there have been a number of population modeling studies looking at just that question. If your target is the reduced growth rates, and the mare that you stop from having a foal for a year or two is helping to contribute to that. If you’re looking for a proportional decrease, it depends on what your state agoal is. If it’s to reduce the growth rate by athe least half, I think all the studies that have been published thus far with limited demographic data on horses it would suggest that at a minimum for mare oriented couldn’t Secretaries only you’d have to be treat — couldn’t sent only you’d have to be treating 20% of the mare.

Chemical vasectomy could be used, no one has incorporated any modeling that experiments where both mare and stallion contraceptive tools were used in combination. The bottom line is that to have a noticeable and a measurable effect that you could measure with good population inventory techniques, you’d have to be treating at least 30-50% of the annuals, of the animals and you’d have to repeatedly do that at least for the mare oriented an animals that were available.

>> Can I follow up on that, you’re saying you’d need to treat them. Is that accounting for the fact that only a certain percentage are going to be effective in contraception. Are you saying that 30-50% have to be couldn’t sented or treated?

>> ROBERT GARROTT: We’re getting way beyond the NRC report. The NRC didn’t do any modeling of that. So I’m speaking partly from the modeling that’s been done in the past of which I was part of when I was involved in the wild horse research in the past. I think that the NRC committee did strongly recommend that fertility control, there’s been 30 years of research on fertility control specifically targeted horses. That the problem of excess horses as defined by appropriate management levels that BLM has now is a real issue I think you can see by the end of that presentation that reducing growth rates can contribute to helping BLM solve the problem.

How it can contribute, how much it can provide, this would be a management experiment because nobody knows. But we do know there are multiple pools that can inhibits reproduction effective with side effects in the context of behavior in ways that were viewed to be acceptable. That could be applied. You about it’s not something that we’d recommend that BLM be able to say that for the next 10 years, we’re going to increment the number of horses treated with TZP or something by a thousand. It needs to be done if it was going to be credible, it needs to be done as science and as an experiment because it’s very uncertain how much of an effect it can have. But we’re very comfortable with the fact that it could have an effect. It could have a measurable effect.

>> Did you have a follow-up question?

>> TIM HARVEY: I’m just thinking numbers. I’m a numbers guy and I’m just listening to within 5-20% growth rate wondering what we have to do to get that growth rate down to something that can be handled by the adoption program. So looking at the growth rate and how does that shake out from foals in the ground and natural mortality westbound the herd? And you know, because that’s going to knock that number down a little bit. I think that again we’re outside the committee. Commit he it’s work.

But there was — some work done outside of the committee. And it’s a pretty easy math exercise if you look at that last table. If you applied if you aenough horses on the range for horses, I think the upper level for appropriate management is something like 23 or 24,000 horses on the range land. If you had that many horses on the range land and you reduce the growth rate by 50%, so dropping it down to 710%, you’d have annual — 7-10%, you’d have annual inyes 3,000 horses that could be adopted equivalent to adoption demand.

So there is the potential that in the long run, effective application of contraception with a base population of what is your appropriate management level now, beyond appropriate management level could eliminate the need for removals beyond what the adoption demand can fake. I’m saying that’s not going to happen in a year (take.) we’re looking at — you’d be looking at a fair amount of time to ratchet up to a nationwide program like that. And a fair amount of science to understand how to do that. But it’s certainly within reason that that could happen.

>> TIM HARVEY: I think there needs to be activity going on that’s what we’re looking at as advisory board. We have to address this issue from a couple perspectives. One is crisis management situation that is looming over us, the elephant in the room. And then you’ve got the long-term. So in trying to come up with a process and a plan that allows you to basically address the problem from more than one perspective or angle, it seems to be the way to do it. The questions are geared at long-term management. One is not exclusive of the other.

>> ROBERT GARROTT: The crises you have now with the budget, BLM isn’t going to remove as many horses this year from the range and they typically removed for the last 10 years which means that next year the annual increment will be bigger than it was this year because you didn’t remove as many horses as you did last year and the year before. And so the longer the budget crisis that BLM faces now that’s going to curtail the amount of money that can be applied to active management of horses on the range applied to horses that need to be maintained in long-term holding facilities that is a real problem that you have right now.

Because the more money that has to go into that, the long-term holding facilities, less money you have to manage, if the budget stays the same. You have to maintain the horses in captivity. The only place it seems you have left to go is not to actively manage as many horses on the range, which means that there will be more out there and larger increments.

>> Page 22.

>> Yes,?

>> TIM HARVEY: One of the things I find — I don’t know the right word for it. I’m looking at perceptions BLM is saying there’s more horses out there. There’s certain citizens groups that main there are nowhere near as many, many out there and have you guys come along with your study and this really is fond that there are a lot more horses out there and appear to be more horses out there than a lot of citizens think.

And I think from an outside agency coming in with that information, I’m hoping will give some credibility to where the BLM stance has been on how to manage these horses in this crisis situation. I firmly believe the facts that you guys have presented. And I’m hoping that maybe the reason I’m kind of asking you to reiterate some of this reaffirm the validity of the percentages in the growth rates and stuff is so that maybe some of the citizens groups that have been fighting the BLM on some of these actions can maybe participate in the process to help instead of fight with them so much over it. And that there’s — the fact that an outside agency has come in and verified that these populations are growing at this exponential rate is really going to create a really, really poor situation in a short period of time.

>> ROBERT GARROTT: The NRC committee certainly does not support the idea that removal program that BLM has had ongoing for the last 30 years is managing the population to extinction. And indeed, 195,000 horses have been removed from the range lands thus far, at least according to the records that the committee receives. And one can do the math on those removal rates and there has to be a substantial base population on the range in order to sustain 195,000 horses removed over that period of time.

And the last 10 years on average 8700 horses have been removed from the range consistently over the last 10 years. And you saw when I added 33,000 multiplied by 1.2 at 20% annual growth rate, that only comes up with the 6600 animals. The disjunct there is we’re not sure how the national statistics go with that.

>> When our facilitator starts to dance around over here, I know our time is limited.

>> That’s extremely important.

>> It is important.

>> I really wanted to understand –

>> Unfortunately Dr. Garrott is going to give us the next presentation so we can carry over questions in the next segment. Joan?

>> JOAN GUILFOYLE: Thanks for saying you agree we’re not managing these animals to extinction. I hope that is a myth that will now die. I appreciate that. I had a couple questions about what you said Bob we’ve been frustrated. Now that I see the best example and the worst example, I think I understand now why it’s been difficult to get a grasp of this. So that was very illustrative. 179 HMAs, different methods, different timing, I can see it.

I appreciate that you recognize that we have made improvements. A handbook, you’re looking at complex as USGS methods that we’ve done training on twice with field people. When we read this chapter, we said absolutely yes and we have been able to put some money aside. I want the board to know, I’ll update you on some of these things as we go along. We’re able to get money into the USGS agreement to help us and be in charge of the design for our field folks on using these as a side or simultaneous double couldn’t methods if those are the most appropriate and depending on the HMA, we absolutely agree. We have to know the number that we’re talking about so we can do the rest of the management so thank you for that. And I’m — I always say this when we get input from external folks that it really does help us — helps me manage and improve the program and so this was — this was — this is an on one to us. — onius one to us.

We met with Dave Powell on the committee that Kara set up last Thursday and he did a presentation for us on all the chapters and to the chapter you’re referring to, the population survey estimation one, one your recommendations is that we have’ centralized database and we agree with that and would love to be able to do that.

The interesting point he also made that in a lot of the public testimony that the committee got was really that the public, the people don’t understand that data that we’re putting out there. It isn’t so much that we’re trying to confuse anybody or hide anything. But they do not understand it. Which is our job to do a better job with that.

I think not understanding and not believing, I appreciate that this report and U.S. GS’s methods will enable us to convey what the actual facts are and that they won’t be disputed and they will be out there and clear for everyone to understand. So I wanted to say thank you. And Boyd, I don’t know if — the BLM as you know, we’ve been looking at this report quite heavily too and we do have a person in charge of looking at this chapter and I just wanted to inite that person who I think is Dean, if you had any questions and comments and he’s saying no. So so that’s all that I wanted to just do, Boyd, thank you.

>> DR. BOYD SPRATLING: Dr., I’d like you to go ahead and proceed on the next presentation of population models and evaluation of models.

>> As he gets a glass of water and rests his throat. I want to let you know, in order for everybody to hear you well, these microphones require that you do have them reasonably close. But also directionally, they almost have to be facing your mouth. (off mi>> Like that when you moved your microphone away.

>> ROBERT GARROTT: Chapter 6. NRC dealt with population models, statement and tasks to evaluate. Population models are models in general. And the first thing I’d like to say are some people think models are esoteric but they’re actually extremely useful tools for any manager because you can understand they can understand and help explain and predict a dynamics of populations and we’re all in the business of managing populations putting treatments on populations and some expectations of where they’re going to go afterwards.

Population models are very useful to any wildlife manager. In particular on this case where we’re doing active management and maybe thinking about even some new and more aggressive management with new tools is allowing population models allow you to manage various treatment options that you might have and predict the consequences from alternative management action. It’s useful in any agency.

So objectives for the chapter was to provide a brief description for models that had been developed for wild horses over the years, in particular we were asked to evaluate the win equis model which si amodel the BLM contracted to be used for management of wild horses in the west and also comment about alternative models that may also be useful. So that’s what we’ll cover here in this. WinEquus.

Very briefly, the first population models for wild horses in the west were probably developed in the late ’80s and early 1990s. I was part of the group of scientists doing that throughout the west when the same issue was really hot in the 80s when there was really aggressive removals going and excess of animals with no place to put them. Soon after basic models were developed and that was trying to put together enough survival and fecundity data to understand how these — how these populations operated.

Then once we had that, then we could start manipulating either survival or fecundity in models to look at various — how those interventions would affect population size and growth rate so that really got started by the mid 1990s. And that’s when the WinEquus model was developed as well. And then going down a little further. 2,000. Mike alouded to ecosystem models where you’re modeling everything from the climate, its effects on the forage and plant base and all the herbivores, not just horses that might be off taking that forage and trying to understand essentially how horses fit into all these ecosystem processes and Mike was involved in that and 2000.

So that’s a brief history of types of models and when they were developed for horses. We believe we spent a lot of time looking at the WinEquus model because this is the model that was built to inform routine BLM management of wild horses. It’s individual based model which means the model is keeping track of every individual animal in the population whether it’s male or female. Whether it’s 2-year-old or 5-year-old or 25-year-old. So it’s age and sex structured individually-based model. It provides output for up to 20-year prediction on the population given whatever you put in to the model. And it’s used by all that — am all the HMA planning that involves management interventions.

So you see this model in all the intervention documents. The EAs and the gather plans.
The real strength of the model is it’s easier to use with minimal train. It’s flexible and you can change lots of input parameters and basic mechanisms influencing population like density dependence and how variable the climate is affecting vegetation. It effectively simulates management scenarios which at that time was female fertility control and removal or a combination of those two things. It provides informative output and it’s very well documented.

All models require data. What has to go into the model are some sort of initial age and sex distributions to the population being monitored. Age specific foaling rates and if desired, the user of that model can turn on parameter values that will implement density depence which Mike talked about earlier as well as environmental casteicity, that’s variation of the amount of forage that might be available based on climate. And of course interventions like removal and female contraception.

The council reviewed HMA gather plans and what we saw was that in general the WinEquus model was used to assimilate alternative management actions for no removals to removals only. Maybe it’s several different levels. And perhaps contraceptive treatments as well.

The plans would provide basic model output in those plans, those gather plans, management plans. Often they were account and pasted from the computer output as an appendix and very often with no interpretation at all. So the output of the models is an appendix at the back of the report but no interpretation of the model. Based on both the reportses and interactions with BLM, representatives, the committee really couldn’t determine if the use of the WinEquus model actually informed the management decisions.

Whether it was used to justify management decisions independent of the model results. Or whether it was simply a boilerplate requirement of management plans. In other words, planning management plan was written, it was required that everyone put some WinEquus model output in the plan and so it was run and put in the appendix. We just tell.
— we just couldn’t tell. It’s probably or it could be a little bit of that each depending on which herd management plan you’re looking at. Just couldn’t tell. Not a weakness but something to consider with the WinEquus model is there are many decisions and assumptions in setting up that model. So somebody has to sit in front of a computer and actually make all those decisions and put those into the — before they can run the model. Those decisions actually dictate the performance and output of the model.

But WinEquus also has the ability for the user not to set any of those things. It just uses default data sets, default parameters. And so, if you choose not to do anything, you can open up the model and run it and not set anything because our default parameters that allow it to be run. The management plans typically didn’t provide any of the information about how the model was set up for the run. So you get a simulation that was put in the management plan but all the information on how the model was set up, whether or not density dependent was added to it, environmental stoichasticity, what age specific survival and fecundity rates were being used as demographic of herd being modeled. So almost universally, not quite, like we looked at one management plan that did a very good job of telling us exactly how the model was set up before the run.

But there was no information about how the model was set up for those particular runs. So without that information, a critical user can’t really evaluate how well that model was mimicking that population and critically evaluate the output. Alternative models, we were asked to look at alternative models. The WinEquus model is a model built to emulate a population of horses and you’re managing primarily on the population or HMA level. So looking into the future, so planning what kind of a population management BLM might use. In the future a little bit beyond WinEquus, in other words, things that could be done to improve a population model for the future would be to have survival and fecundity and age structure data that better matches the target population.

WinEquus has three default data sets for these things that all come from three different herds that were researched in the ’80s and whether or not any of those default parameter sets are even legitimate for those herds that they were generated from 20 or 30 years later. Might be a little bit questionable. There’s a future to better match the populations you’re going to be modeling and one thing that can be done is use herd specific age and data from gathers and removals.

Often times those are substantial removals and they aren’t selective. There’s information on the age and sex structure from previous removals of the population that you’re actually model for. They could be used rather than the default data set. This brings back the idea again of using demographic data from closely matched sentinel populations. So, if you improve inventory techniques and then you also identify a suite of populations that you apply those inventory techniques to routinely in extremely arid environments, mountainous snow environment, across a sample of populations that represent the difference with ecological settings that horses are found in throughout the west, then you could at least say that the herd I’m going to manage comes from a very arid desert environment and we have sentinel population that’s provide fecundity and survival data that are similar to that, parameterize and model with that, it doesn’t come from your herd but it’s ecologically similar.

So you have a suite of default data sets so you match the default data set that you’re going to use with the ecological conditions of the population that you’re modeling. It also might be important have the capability to model both mile and female contraceptive techniques which the WinEquus couldn’t do. If you can’t get the population growth rate to meet your management objectives with just male or female contraceptive techniques, it may be a combination of the two can do a better job.

Right now we have no models that can apply both removals, mare oriented contraception and male oriented contraception and it may be that that could be a useful addition in the future. If those sorts of interventions are going to be considered. The other thing we learned since WinEquus has been built there’s been good studies where horses have been manage the pretty heavily with fertility control. These are primarily the shackle Ford banks and as teeing island situations and from those studies, as Mike alluded to, when you shut down reproduction in horses and don’t have that additional energetic costs, they’re healthier, they live longer.

So there’s a feedback there that we know enough about or start to know enough about to be incorporated in population models future. Also in those studies, there’s an indication that repeatedly for the PZP vaccines that if you reedily treat mares with PZP, when you withdraw that treatment, more times animal has been treated with PZP, the longer it is for her to return fertility to the point with enough treatments they may indeed be sterile. These sorts of demographic feedback provide a means of trying to develop models that are more realistic for what we’ve learned in the science thus far.

Another type of model that might be useful is a comprehensive model of the wild horse and burro program. So right now we’re talking abouted month eels models just for a specific herd unit. We know there’s 172 of those out there. So that would all relate to the free ranging herd populations. BLM manages more horses in captivity than they do on the range. So entire program includes the demography of horses in short-term fast its and long-term facilities and movement of horses between those.

That’s your model. Having a more comprehensive program might provide ensites for future especially long range planning budgetary planning and things like that that could be helpful as well. Finally, a different type of model adaptive resource management models, short-term for it. ARMS. I think could be very useful moving forward. This is the idea that BLM managers need to make important decisions about what tools or combinations of tools they want to use to manage horse populations that’s made with incomplete and imperfect information about how the horses will respond to management actions. Adaptive resource management models is a structured way to make decisions scientifically incredible manner where you continue to learn so you reduce the level of uncertainty as you continue on in the management program.

The premise here is there’s a lot of uncertainty and the more we could reduce the uncertainty, the better we could find management. Decisions have to be made in the face of that uncertainty we’ve got to manage even though we don’t know perfectly how many animals are out there, how good the contraceptive treatments are going to be, what sort of feedback might be there and we have to keep making decisions over and over again. So, if we have monitoring in place or it could be implemented, then we can actually learn every time we make one of these management decisions.

Here’s the process. If we do X, Y, and Z, here’s the objective. We want to reduce population growth rate from 20% to 10%. So we have an explicitly stated objective. We say okay, how can we get that done? With are our management alternatives. We could have PZP vaccine at a certain level. We could have chemical vasectomy at a certain level. Combination of those. Combination of removals and both fertility interventions, all the options available. And you make predictions about those options, which those options will best meet your management objectives or predicting will meet them. That’s your population model. So you manipulate the population model based on interventions and make a prediction. That model was your best knowledge. That’s your best guess, you implement it and follow up and monitor and see if you got what your model told you, whether or not did meet your objective?

Were the predictions met? If they aren’t, then you either chose the wrong management alternative or your model is not quite right yet. So you get chance then to go back and say well, I should have chosen another objective you need to change your model because there’s other feedbacks we don’t know. Next time you go back and make decision you’ve reduced uncertainty and you’ve improved your ability to manage over time.

This arc RMS model is being used to learn as you go because managers are experimenters. They’re researchers that learn how to do things better if you do it in a structured way and we think this could benefit BLM in the and the wild horse and burro program and models themselves if a model like this was implemented. So in summary, we think models are essential tools for management, that the WinEquus model is scientifically sound but its application for informing management has been poor or at least as much as we can understand from how it’s being used with the documents.

We think it’s implementation to help inform management has not been what it could be. We think substantial improvements could be made for planning future population management or improving on models existing. And we think models of free ranging and BLM could be useful especially in the context of the budgetary constraints you have. It costs a lot of money to manage the captive program, understanding the dynamics of that — those captive horses and your options there and how that influences how much money you have for free-ranging horse manage the could be useful.

and we think implementing adaptive resource management models could strengthen the scientific credibility of the program going forward. With that if I have questions, I’ll take them.

>> DR. BOYD SPRATLING: Questions. John.

>> I’d like to follow up on the adaptive management plan you’ve presented there because as you know, we’re hogtied on a lot of avenues to control these horses. My question is of all the practices that you presented which of these do you think would be most likely to be able to be presented and get on the ground so they could actually control the number of foals being produced.

>> That’s completely based on what’s likely depends on the political actions taken by all the people that care about horses. I think that any combination of those three fundamental management actions you have, removals, female oriented fertility control or male oriented fertility control, all of them can help. They all have costs: They all have proponents and opponents.

So the policy on what could be used effectively in the political arena I can’t — I can’t tell you. But I can tell you that no matter what you do as — no matter what the agency does, if there’s no assessment of how well that is done then it’s difficult to sell it to the public over time. So going out and saying well, next year we’re going to treat 500 horses with some contraception, if there’s no explicit objective, and no follow-up to tell how well you did, you simply will have a eroded public support for continuing along any track that you don’t follow up with reasonable monitoring and something like this adaptive resource management model.

Which tools you use, that say political decision and is right now an economic decision as well. None of them are cheap. If you believe that horses have to be active managed, that the public will not accept self-limitation as we heard about the consequences, that they have to be actively managed, all the active management tools you have are expensive. They’re all invasive. They’re all going to require capturing and haled handling a lot of horses which a lot of people don’t like. And so there’s going to be political obstacles to any of those tools or combination of those tools and I don’t know how you get there.

>> From your perspective, do you think you got any choice?

>> ROBERT GARROTT: Well, you could just simply stop managing horses and they would self-limit. And I think you can look and see what’s going on in Australia right now with 400,000 horses and catastrophic mortality happening because of the drought and there’s no reason to think that that wouldn’t happen here. I think — well, it would violate every mandate for responsible management of public uses.

So I think you have to manage horses, yes. Most of us agree that self-limit is not an option. Then we have to go back under today’s parameters we’re operating under. To get a handle on foal crops. So, if that’s what we’re looking at, then we have to go back to what your suggesting, I think you’re on the right track, getting it implemented is my biggest concern.

>> ROBERT GARROTT: There’s only two ways to reduce the annual increment. You reduce the population growth rate and/or base population that’s growing at that rate. So you have reproductive intervention of a suite of tools that can be used to reduce population growth rate and reducing the number of animals, base population, you only have one tool there right now and that’s removal and captivity. That’s expensive and prohibitive because you have no place to put them.

>> John: Alternative is expensive also. Thank you.

>> I have a quick question. I’m looking at the enormity of trying to implement these changes. I’m realizing this is outside injure study area. But it seems to me it would make sense to implement them and decide on a couple different passes. There is no one answer. We’re looking at a quiver of ariose, not one silver bullet. Does it make sense for you — for the BLM to perhaps select several HMAs that we would focus on and implement using several different tools and permutations of some of the things that you folks have come up with? And go head and implement some of these changes and see what the results are over a year or two. Room than trying to broadcast every single horse on a ranch in 179HMAs, as a scientist I would think it would make more sense to approach it individually so you can also see what’s going on. You can then judge the results of what you’re doing. A little bit easier?

>> ROBERT GARROTT: This is again where the agency is in a really hard spot. So, if you there’s been 30 years of couldn’t ceptive research on wild horses and you could pick a couple HMAs in the west and do a several different types of treatments. You could have replicates. And you’ll get good science out of that. You’ll learn from that especially if will follow up well from treatment and modeling. So that’s a dilemma. That’s good science and you can do that at the small scale and be really cautious but you still have the issue you’ve got to do something with your annual increment right now. And so they aren’t going to help you with the national level. They’ll help you get good science and understand what the effects are of these controls.

You know, that will be a 5, 10 year process to try to fine tune the technique. Reproductive inhibition techniques before you go a little more aggressively with the national population and mean while you’re still going to have to take care of the annual increment. So whether or not BLM moved forward with any sort of management level applications of contraceptive treatments are keep it very small scale couple HMAs. That’s a policy decision that needs to be made.

Using sentinel populations to get more frequent and additional data. If you were — wouldn’t you also agree that those would be the places fairly quickly if you decided to start working on some of these sentinel pop Asian las that’s that where we would do adoptive management experiments. More about demographically would be better places for to start and herds that are intractable or like a herd that only gets surveyed every 6 or 8 years. Simply because you don’t know the form answer of that herd to begin with. So the more you know about a herd, the better able you are to tailor your first experiment, your first treatments.

It tends to be that the herds you know most about are small herds and the problem isn’t as much the small herds as it is the really big wide ranging herds in remote areas that are most subjected to drought. But in the ideal world, you know, a lot about the herd before you started so you really would be able to parameterize your models well and have a lot of confidence in them.

Go small herds because it would be easier to know what you’re doing. And ideal world when all your worried about is science and not managing what — not managing the national population. Thanks.

>> The LLC out of Florida that owns the rights to the ARM model. Who are the individuals behind that?

>> ROBERT GARROTT: The adaptive resource –
>> .

>> Yeah who are the individuals who have that LLC?

>> ROBERT GARROTT: Well, I would say that the — the primary people behind adaptive harvest management are the scientists out of paw tux 8, the USGS scientists. We heard a presentation from one of them with Jim Nichols. The committee.

They’ve gone all over the nation and have workshops on adaptive resource management. They’ve built technical models, there’s several books published on that. They’re sort of the experts although it goes back before the paw tuxet people got involved. I think — oh, my, I should know this. I think it was actually generated for fisheries. Ocean fisheries in particular. Can’t remember the name of the guy who wrote.

>> CALLIE HENDRICKSON: Just go back real quick. Discrepancy of numbers were you able to get the dates for the reason you got the numbers, for the Web site for the total number is as of usually, like, February 28 of whatever year. I just was wondering if there was any reason that sort of date might have been part of the reason why you had such different numbers, I don’t know.

>> ROBERT GARROTT: We just had no information. I think that’s plausible that the range manager that did a count in December knows that the population estimates supposed to be for the end of February. And estimates that maybe it was a bad winter and he had a 5% mortality rate between that 3-month period and in good faith adjusted that count by what he thought might have been the population mortality between the count and when the population numbers to be reported. We just simply don’t have it. And to — and to be fair, there wasn’t — when we asked for the numbers, to the national office, and the national office went to the field offices, I assume they didn’t ask for a big long diatribe on the numbers they fill in the table and send it back and we have limited ability for individual field area people to provide all the rationale. It would have been nice to have that.

>> If I could, Boyd, folks in the audience who work for BLM can explain how this data transferred. I would invite them to do that. It seems to be a littlen clear. Is that Zach or Dean or somebody.

>> Dean is who reinteracted with a lot..

>> Can you gentlemen explain how it worked.

>> I’m Zach Ryan hold, the senior wild horse and burro program specialist. The way rereceived the information was exactly that. We received a request to the committee either through Kara. She then relayed that it request to myself. I then relayed that request to the state lead who then spoke directly to the field. The field provided that information. It was in a table. We did speak to the committee and with Bob and explained to him that there has been a number of adjustments at the date and time of reporting for various different reasons over the last 30 years.

And those were primarily due to program decisions. Either it was based on when the budget was falling — the budget cycle ended or began. Whether or not we were trying to adjust it to capture the whole — the whole crop after the full crop trying to get it to be in sync with the public lands records and when those are actually reported. So it has varied over the years when that is reported to the national office. And you know, none of it — it was all in order to try to get it in sync with some sort of program that was occurring at that time. Or for budget reasons. There weren’t any hidden underlying acts to try to deceive the public or anything like that. It was merely we were trying to bet it in sync with one reporting system or another.

>> Dean, did you want to add anything to that or no.

>> Dean: Just a couple clarifications. The national office did not manipulate the data any year since I’ve been involved since 2013. But we get HMA is what they reported to us (off mic) and there’s a lack of information about how they’ve been manipulated the data, increased the estimates since the last survey. But two things it contribute to the inconsistency. There’s not information about removal which creates oh, my gosh, how did this number go from this to that and had that information been available, it might have been more easy to interpret but the main message is here. There’s good findings.

We need to do a better job of recordkeeping and reporting to the public explain what methods we’ve used the findings are sound and good and that’s the direction we desire to go and that we’re headed. So –

>> As I said, we want to — we want to analyze each HMA to see which method is best for that HMA including the two that the USGS recommended. We have to do a better job of that and we are going to. Thank you, Zach and Dean for clarifying some of that.

>> Doctor, I have a couple questions then because modeling tends to have my eyes glaze over and I have a tough time getting around it as a clinician. But I’m going to go back and ask a question about actual counts and methods. And I think we’ve — you mentioned that Mark recited or recaptured dash would not be practical in the west where we have a few thousand horses as opposed to a couple hundred. Account — what model or what attempt at counting would account for human error because I think we have to sympathize with people sitting in that aircraft on any hot bumpy day or whenever they happen to have their flight time be up in the air.

How do we standize the differences in people sit the sitting there doing the count because that I can see would be tremendous differences to human oriented ear and differences being able to spot and see the horses in different locations. PGA or whatever is covering the ground. How do you feel about that? What would your recommendation be in that sense? Since wide life became a science in the late 1930s, one of the primary activities in research is figuring out better ways to inventory animals and statisticians have developed a lot of innovative tools to do that.

So we do know that from other studies that there are many places that horses are counted very effectively especially the wide open sagebrush plains. You see dust trails of those when you start flying, you can find them well and couldn’t them well. There’s no trees. There’s been a good science that tug that you might only miss 10 to 15% of the animals under those conditions. Basin rank country or book list aerial survey you may only count 50%.

So fundamentally without having estimates of detection probability for each of your senses, you could provide your herd management areas based on cover topography, those things that make it more difficult to count animals. In the ballpark when we’re counting the desert, we’re probably not missing more than 20%. When we’re counting some mountainous area that has juniper all over it, we’re more likely to couldn’ting maybe sex 0 to 70% dash counting maybe 60 to 70% at the most and just make an adjustment and it’s just an approximatization based on what we know about how cover and topography affects it in a more rigorous way one of the methods at USGS suggests is double observer survey.

If you’re going to use a plane, you have people independently recording which animal groups they see and when and then you have the observer one independent observer in the plane that’s seen so many groups of animals on the survey. A second observer that independently saw so many groups of animals on that survey. They identify which animals. The first oftener saw and the observer saw. Which animals the first observer saw and the second didn’t. Which the second observer saw and the first didn’t and from that you also know statistically the probability that both observers missed some animals.

And so USGS used one of those methodologies of double triple or even quadruple observers on the plane that recorded data independently and statistically you can get some of those things. There are other mechanisms too.

>> But logistically, you’re sitting in an aircraft, looking out the right window or left depending where you’re sitting in the craft. If you’re going to have that true double or simultaneous double count, you’d have to have people sitting on the same side of the aircraft, I would think. I mean, I can see so many variables sitting there. I can fully understand the difficulty in coming up with legitimate numbers.

>> I would say 1930s, the tools are interest to make adjustments and appropriate Constance limits on those. Right now we have population estimates with no ability to say how precise those are. When you use those tools even though they’re imprecise, you can get scientifically rigorous population estimates that adjust for animals not detected but that also give you confidence intervals that provide — so instead of saying we have 33,000 animals or let’s say 1200 animals in a herd, based on the rigor of our scientific data, that’s our best plan estimate. But the — but given the data, it could be anywhere between 800 to 1600.

>> I understand there are actually tables or data out there that okay, given a certain type of cover, certain type of habitat that you would use a certain percentage of accuracy. Are those tables –

>> Yes, you could just do the ballpark approximation, it would be better than nothing based on some of those attributes. But there are no tables that — to tell you that the ideal thing is to be able to collect data about detection probability at the time we do the survey. You can use the same aircraft, the same observers, different day or in the morning versus the afternoon. Long shadows versus bright sunlight and the proportion missed will be different.

So ideally you’d like to get that information for that particular survey U USGS evaluated some of those techniques, they flip flopped that several of them were practical. Could even reduce the cost of inventorying it because it might be better done with fixed wing and helicopter and if they were scientifically valid and rigorous.

So there’s lots of different ways that one can go and that would be up to BLM to decide if they want to change their inventory techniques orfy them how they’d want to go about that.

>> Hello. Boyd, I think you — I just want to be clear the USGS. Excuse me at Fort Collins simultaneous double count and mark recite and there are several people in the audience who have been trained on that and have done them, I’m sure, someone back there is going to give us a little clarification who has actually done them on horses. Is that someone out of am I eyesight.

>> It was said not in these words. Simultaneous double count part of what gives you confident limits excludes excitability of animals and also things like the experience of the observers and the position in the air crave craft. So a lot of those variables are factored into what gives you confidence limit and that’s why you have a limit of low confidence to high confidence that includes variables like snow cover, sightbility, bias, based on environmental positions, but position in the aircraft and experience that of the observer can be factored in.

>> So there parameters that are set.

>> That’s how you arrived at your statistical estimate of your 90% –

>> Thank you.

>> I’m sorry, this is Dr. Al cane. AFIS veterinarian assigned to work with the wild horse and burro program.

>> Hi, in the NAS report there was some space dedicated to infrared technology. I’m curious in the areas where environmental issues, tree cover and stuff like that, I know in the am ill Terry applications they use it in the cooler part of night to get body counts and who’s out in areas. It seems to me that might be a very effective cost effective way. I know that there’s restrictions on the drone flying because of aver air time allowances.

But it seems to me with the unmanned aircraft using infrared technology flying at night so that the images quality is way better at night than it is during the day especially at hot regions, is that something that would give you more accurate counting or is there problems with the horse thing that I would be unaware of using it for horses?

>> Well, the USGS team looked at that. And they didn’t think at least at this time that it was practical. Partly because that had to be done on contract and cost of forward-looking infrared system mounted on the plane that they had to contact would be considerably higher than what’s being paid right now. The other thing about infrared that was an issue is whether or not you can get an image of a higher resolution that you can tell different species of large body mammals. Obviously the lower you fly and the finer the spatial resolution you can get outline to define species but that means more intensive flying more time in the air.

This time you’d have to look at the report I think they said they didn’t think it was practical primarily because it cost so much to contract all those remote techniques had the potential down the road to be used that they still had the same issues of detection. So you still have the issue of having to do the research to figure out what the detection probabilities are and how they vary over the different types of situations that you might encounter and that very different terrains that you have. So those are all possibilities but USGS scientists, I think did not think that they were effective at least now. That surprises me.

>> DR. BOYD SPRATLING: We’ve conditioned over our agendized time.

>> No way.
>> No way!

>> Is there time for the person would led this chapter review to just see if he has any questions before we –


>> Roger, okay I’m getting a no. Anybody else from BLM.

>> Okay, never mind.

>> DR. BOYD SPRATLING: So tomorrow we invite you to be back. Does the public have access to the agenda? You’ll see what we have coming up tomorrow at 8:00 a.m. he vine it you to return.

>> Did I hear correctly that we might ask Kara to say a few words to start off tomorrow morning.

>> Okay. Okay. And just a final reminder we will close tomorrow 3:00 to 5:00 for two hours of public comment. Sign up and we’ll allocate the time based on the number of people, mike, Bob, thank you so much. Mike is back with us tomorrow. We very much appreciate it.

>> Thank you, Dr. Garrott we appreciate your time and Dr. Cuff Coughenour.
With that we’ll adjourn until tomorrow morning.


Watch the live-stream  here

A dark day for native wild horses ~ National Academy of Science Report published

Photo courtesy BLM

Photo courtesy BLM

The NAS report has been released and is found here.


Statement from Anne Novak, Executive Director of Protect Mustangs

We are grateful that the National Academy of Science (NAS) recommends stopping cruel roundups  but we challenge their decision to control alleged overpopulation like a domestic herd with humans deciding who survives and breeds.

NAS deploys the BLM overpopulation myth to push EPA restricted use PESTICIDES (Immunoconraceptive PZP & GonaCon®) as well as sterilization on Native #WildHorses.

This is part of the plan named after Ken Salazar, the previous Secretary of Interior, whose mission was to wipe wild horses off public land, stockpile them at taxpayer expense and send many into the alleged slaughter pipeline.

The Salazar Plan began in 2009 -10, despite public outrage. Its focus was to remove wild horses and burros to facilitate the energy and water grab on public land.

The renewables market abroad is hot. Fracking and exporting natural gas through pipelines across the West is causing environmental damage. Wild horses would require mitigation so they lobbied for the BLM to get rid of them.

The Salazar Plan feigns an overpopulation crisis to remove most native wild horses from their legally designated ranges and stockpile them in government holding. They are torn from their homes, families and at risk of being sold to probable slaughter.

Overpopulation is a MYTH used to ruin native wild horses. There are maybe 18,000 wild horses left on more than 31.6 million acres of public land designated for their use. They are reproducing at a higher rate because nature knows they face extinction from the gluttony of roundups since 2009. Immunocontraceptives are risky. Sterilizing them is wrong. Put the 50,000 in holding back on the range so they can fill their niche in the ecosystem.

We are witnessing the final attack on the indigenous horse and it must be halted.

Man-made fertility control will domesticate wild horses and wipe them out. Survival of the fittest is Mother Nature’s way to select who breeds to protect the herd.

Domestic horses are manipulated by man. Their weaknesses are evident as a result.

We ask the NAS, the BLM and certain members of the advocate community, “Do you really think man can choose who breeds better than nature? Do you realize that by supporting chemical fertility control many will be sterilized and loose their place in the herd?”  What happens when they all die off?  Will you then realize they were never overpopulated?”

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Statement from Jesica Johnston, MA Environmental Planning

The National Academy of Science’s findings clearly state that the Bureau of Land Management (BLM) has failed to provide accurate estimates of the nation’s population of wild horses and burros. Therefore, the NAS cannot conclude that a state of over-population exists and or provide a recommendation for artificial management considerations such as “rigorous fertility controls” to control populations for which the complex population dynamics are currently unknown. However, the NAS is recommending science-based methods to improve current management practices, population estimates, and the overall health of the ecosystem which could provide key information toward sustainable and effective management that could prevent the removal of wild horses and burros from our public lands.

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Dead wild horse (Photo © Craig Downer)

Dead wild horse (Photo © Craig Downer)

Statement from Craig C. Downer, M.S., Wildlife Biologist, Wild Horse Expert, Author and Founder of the Andean Tapir Fund

BLM plans to use “aggressive birth control” to prevent the expansion of the wild horse/burro populations that remain. Chief among the drugs to be used is PZP (porcine zona pellucida). This injected drug covers the eggs, or ova, of mares, preventing sperm from fertilizing them. It is experimental, however, and has some questionable effects upon the horses themselves, both individually and collectively. For example, its effect leads to mares’ repeatedly recycling into estrous, thus stimulating stallions to repeatedly mount the treated mares — all to no avail. This frustrating situation causes much stress among individuals of both sexes and a general disruption of the social order, both within bands and, as a consequence, within the herds themselves.

Other unintended consequences of PZP are out-of-season births occurring after PZP’s effect has worn off after a year or two.  These births have been observed during the colder late autumn and winter seasons (e.g. Pryor Mountains her by G. Kathrens) and their un-timeliness causes suffering and death among both foals and their mothers.

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The underside of a skull, showing palate and teeth, of Equus scotti is seen in this photo provided by the San Bernardino County Museum. The remains of the Ice Age horse were found for the first time at Tule Springs in Nevada.

The underside of a skull, showing palate and teeth, of Equus scotti is seen in this photo provided by the San Bernardino County Museum. The remains of the Ice Age horse were found for the first time at Tule Springs in Nevada.

Statement from Debbie Coffey, Director of Wild Horse Affairs, Wild Horse Freedom Federation

PZP and other fertility control should NOT be used on non-viable herds.   Most of the remaining herds of wild horses are non-viable.  The NAS and any advocacy groups that are pushing PZP and other fertility control have not carefully studied all of the caveats in Dr. Gus Cothran’s genetic analysis reports along with the remaining population of each herd of wild horses.
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By U.S. Government [Public domain], via Wikimedia Commons

By U.S. Government [Public domain], via Wikimedia Commons

Statement from Jennie Barron, Director of Wild Horse Hub Central

1. Wild horse mares that are darted with PZP can become permanently sterile, making the viability of the herd impossible as the older mares die, there are no mares to have foals.

2.  If the Lead Mares are darted with PZP, they can become sterile, making the family herd disorganized; the stallion does not understand why she won’t foal; and she may leave the family herd she knows because of the disorientated. This has happened with older mares as they are not able to foal and they are the lead mares, leaving no mare to teach them where to graze, find minerals, water, or when to do certain things that wild horse herd families do.

3.  The mares who are pregnant after they have been darted with PZP can and do foal out of season. This means that they can not keep enough milk for the foal; and the winter weather is too harsh for the foal to survive. Prognosis: death.

4.  Considering the consequences stated above, this is too risky a business to lay at the feet of an already depleted wild horse herd. It must be taken into consideration that PZP is just as dangerous as a mountain lion, it is permanent, and it is deadly.

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(Photo © Anne Novak, all rights reserved.)

(Photo © Anne Novak, all rights reserved.)

Statement from Carl Mrozek, Filmmaker of Saving Ass in America

To its credit the extensive review of the BLM’s failed Wild Horse & Burro Program criticized the agency for relying primarily on aggressive culling of wild herds primarily via helicopter roundups which “perpetuate the overpopulation problem by maintaining the number of animals at levels below the carrying capacity of the land, protecting the rangeland and the horse population in the short term but resulting in continually high population growth and exacerbating the long-term problem” the National Academy of Sciences” declared in a preliminary press release.  What they’re referring to is the principle of compensatory reproduction by heavily-stressed wildlife populations needing to rebound from population declines due to many factors.

Unfortunately, they quickly recommend a different intervention as a better solution without considering the ‘ do nothing”  or ‘placebo’ option which is an integral component of every credible field trial for pharmaceutical and other ‘treatment plans. Had they searched for examples of herds which have undergone minimal or no culling in the past decade or so, they would have found multiple examples of herds which appear to have achieved homeostasis (equilibrium) or something approaching it, naturally, i.e. without BLM-sponsored roundups or fertility treatments.

At least two mustang herds I’ve observed and filmed in Nevada and Arizona over the past 5-7 years meet those criteria, and some burro herds as well. The important point to remember, is that all of those herds cost the taxpayer virtually zilch to maintain in the wild. This contrasts with the cash-intensive hands-on management strategy revolving around helicopter roundups, warehousing of captured animals for life in long term and short term corrals and feedlots, as well as the fertility treatments, -the least costly and disruptive of these predominant management methodologies.

The bottom line is that sometimes we can do more, and do better, by doing less, or by letting Mother Nature do what she does best: sow and weed.

Hopefully, this option is explored somewhere in the freshly released report, and will be actively considered by the new hierarchy at BLM and the Dept. of Interior, and with much more intensive collaboration with wild equine afiscionados  committed to the survival of these herds in the wild as intended by the Free Ranging Wild Horse & Burro Act of 1971.

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PM Hazard Foter Public domain Marked Sterilize


Statement from  Jaime Jackson, Executive Director and the founder of the Association for the Advancement of Natural Horse Care Practices

“Whether wild horses are sterilized or chemically “contraceptized”, at stake are the forces of natural selection being usurped by what will be tantamount to a program of “domestication eugenics” — humans determining who gets to breed and who doesn’t in wild horse country. If that door is opened, we will have turned drug companies and profiteers loose on our wild horses. We now know with certainty that such veterinary/medical interventions cause laminitis, colic, and other types of metabolic breakdown and disease. More drugs will then be needed. Thus, more profits will be pocketed. A brutal cycle is unleashed that causes harm to any horse, wild or domesticated.

“…What we are talking about here is the de facto domestication and subsequent contamination and destruction of America’s wild, free-roaming horses. It is bad enough what we’re also doing to another 51,000 who are captured, and stand idly by at tax payers expense in government holding corrals and private “preserves”? Support the misguided’s push to turn wild horses into pathological parodies of their personal horses? No thanks!

“The AANHCP offers another vision for genuine wild horse preservation that clear thinking people should be able to understand. This vision will do all things that eugenics can never do. And humanely so without compromising natural selection or burdening the tax payer. So, if you really want to help our wild horses, say no to the Obama Administration and the National Academy of Science’s “zero them out” for the corporate land grab, say no to [any] eugenics visions, and no to the drug companies and PZP (and other) pharmaceutical patent holders hungering for the ovaries, testes, and DNA of our America’s wild, free-roaming horses in the name of profiteering at the animal’s genetic expense.

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Sam (#3275) is from California's High Rock area (Photo by BLM)

Sam (#3275) is from California’s High Rock area (Photo by BLM)

Statement from Valerie Price, Biological Researcher

PZP is a pathogen derived immunocontraceptive vaccine, it SHOULD be intended for use ONLY in captive animals. PZP stands for Porcine Zona Pellucida. This, and other immunocontraceptive vaccines are derived from pathogenic bacterias. PZP contains Mycobacterium tuberculosis, the organism that causes tuberculosis in humans and many species of livestock, including cattle. The bacterial component of the vaccine is supposed to be a killed form, but due to the potential for bad lots causing live tuberculosis to be transmitted to humans and animals, and due to concern over the possibility of contaminating the food web, PZP would have been unlikely to recieve approval by the FDA. Instead, the EPA approved PZP as a pesticide, leaving public health professionals in ignorance of the biological nature of this vaccine. It remains unclear whether the restrictions for use allow for any PZP treated animals to be released into the wild. While such a release could pose an ongoing threat to public health for both humans and animals, the effectiveness of PZP as an immunocontraceptive vaccine is negated by only 10% immigration or emmigration into treated herds, according to a study conducted by Texas Parks and Wildlife with captive, white tail deer.

A recent clinical study in cats treated with PZP found a high percentage of injection site abscesses. Rumours of abscesses occurring in horses treated with PZP by the BLM has raised the spectre of possible bad lots of vaccine already having been used. Human exposure to tuberculosis could possibly be a concern and it is recommended that all BLM agents and equine advocates who have come in contact with the vaccine, or with treated animals, be tested for tuberculosis, to ensure the bio-security of the public.

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PM Gov Land Map.jpg.jpe

Statement from Lisa LeBlanc, Independent Researcher & Equine Advocate:
We can not depend on ‘estimates’ of on-the-range populations or the accuracy of ‘reports’ of nearly 50,000 in captivity; neither history nor biology support the Bureau’s claims. There is a supposition that wild equine advocates have no notion of the enormity of wild or captive wild populations due to a ‘sympathetic’ response, but we can only base our data on the information we’re given, and the knowledge we already possess. For example:

Absence of any data indicating mortality, either on-the-range or in holding.

Denial of ‘reciprocal’ breeding, that is, the animal’s biological imperative to replace what’s been taken.

Absence of knowledge of specific herds and their behaviors, key factors in determining accuracy of foaling rates, which often fall far below the National average of 20%.

On-the-range herd management must be as accurate as possible, visually documented for Public use and managed through science and study. How can effective management occur if the basis of all aspects is ‘estimate’?

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Check back for more statements from wild horse and burro influencers. We are updating this page.