EPA classifies wild horse birth control drug PZP as a pesticide

Wild Horses: Randy Harris Photo

WILD HORSES (US) — This is not news; simply a clarification. Certain readers have questioned our reference to PZP (Porcine Zona Pellucida) as a pesticide which is used as a type of birth control on wild mares living on federal lands. As Protect Mustangs state: Pests are invasive species. Wild horses are native. Drugging up wild horses… Continue reading EPA classifies wild horse birth control drug PZP as a pesticide