We are against using anything as a pesticide on native wild horses and burros. The EPA passed PZP as a restricted-use pesticide for wild horses and burros in 2012. This gave wild horses and burros the designation of PESTS and must be reversed.

We asked Jay Kirkpatrick, Ph.D to define “Native PZP” and this is what he said.

“Native PZP is the family of glycoproteins extracted from porcine zona pellucida and administered without any alterations, such as “PZP-22″, in which the PZP is encased in a biodegradable, non-toxic material so that it has a longer duration of action (and which doesn’t work!). Research is ongoing elsewhere to find out why it doesn’t work. SpayVac is a proprietary product made in Canada and the effects of this formulation cause both uterine edema and ovarian damage. Native PZP does neither – based on a 28 year data base.” ~ Jay Kirkpatrick, Ph.D

The Science and Conservation Center
2100 S. Shiloh Road
Billings, MT 59106