Wild horse and burro populations in the western US are managed by the Bureau of Land Management under a politically contentious framework with significant welfare implications.
Wild horse and burro management in the US is one of the most complex animal welfare policy issues in North America, involving competing interests from ranchers, conservationists, animal advocates, and federal agencies. Helicopter roundups cause acute stress, injuries, and separation of family bands. Gathered animals may spend years in holding facilities. Fertility control using PZP (porcine zona pellucida) vaccine offers a humane alternative that maintains horses in their social groups while managing population growth. Expanded investment in fertility control programs, adoption incentives, and improved holding conditions would represent significant welfare improvements within the current management system.