Wild horse and burro management on US public lands involves welfare trade-offs between overpopulation impacts and the costs of roundup and captive holding.
Wild horse management welfare involves both the welfare costs of unmanaged population growth including starvation in overcrowded ranges, and the welfare costs of management interventions including helicopter roundups and long-term captive holding. Helicopter roundups cause acute fear, exertion injuries, and foal separation. Long-term holding in feedlots denies horses the wide-ranging behavior of their wild existence for years. Fertility control through PZP vaccination allows population management with far lower welfare impact but works slowly. A welfare-optimized approach invests heavily in on-range fertility control to prevent roundup necessity.