Learn more about “Fertility Control”

Fertility control is a humane management strategy for wild horses, primarily utilizing the Porcine Zona Pellucida (PZP) vaccine. Administered via remote darting, PZP is a scientifically proven immunocontraceptive that effectively prevents pregnancy in treated mares, boasting an efficacy rate of over 90%. This method preserves the natural behaviors of wild horses and is endorsed by the National Academy of Sciences. The American Wild Horse Campaign (AWHC) implements the largest fertility control program in the world on Nevada's Virginia Range, aiming to reduce population growth rates, alleviate habitat pressures, and minimize the need for inhumane roundups. By focusing on fertility control, AWHC promotes a sustainable and ethical approach to wild horse management.