The advocates never stop.
PZP is a restricted-use pesticide that tricks the immune system into attacking the ovaries, resulting in sterility after five years of treatment.
RELATED: If PZP Is Reversible, Why Is the Assateague Herd Still Shrinking?
Western Horse Watchers Association
Exposing the Hypocrisy, Lies and Incompetence of the Wild Horse Advocates
Western Horse Watchers Association 