Wildlife

Wild Horse Contraception Programs

Porcine zona pellucida (PZP) vaccines offer a humane alternative to roundups for managing wild horse populations.

Key Facts

PZP vaccines prevent fertilization without removing horses from the range
Treatment requires annual darting with minimal disturbance
Treated mares remain in their bands with normal social behavior
Roundups cause stress, social disruption, and long-term welfare harm

Welfare Considerations

Traditional roundups and removals cause extreme stress, injury, and permanent social disruption to wild horses. Fertility control with remotely-administered vaccines achieves population management goals with far lower welfare costs.

What You Can Do

Support funding for PZP fertility control programs
Advocate for fertility control as the primary wild horse management tool
Oppose roundup proposals where fertility control alternatives exist
Donate to organizations implementing wild horse fertility control