Fertility control through vaccination provides a humane alternative to helicopter roundups for wild horse population management, with growing evidence of effectiveness at landscape scale.
PZP fertility control for wild horses represents a welfare-positive population management alternative to helicopter roundups that cause significant acute stress and mortality. The dart delivery approach is welfare-positive relative to roundups: individual mares are treated in their natural habitat without capture and confinement. Long-term management through fertility control maintains populations at sustainable levels without repeated welfare-costly roundups. The welfare and political appeal of fertility control — it avoids the controversy of helicopter roundups and large-scale culling — makes it a practical advocacy goal that welfare organizations and range managers can support together.