American and European bison conservation programs have restored once-extinct populations, but welfare challenges remain in managed herds and reintroduction sites.
Bison conservation is one of wildlife restoration's great success stories, but the welfare dimensions of managed populations deserve attention. Herds maintained in fenced reserves may face reduced foraging opportunities, genetic bottleneck effects, and management interventions including vaccination, contraception, and culling that cause acute welfare impacts. Reintroduced populations face predation risk — which itself has welfare implications — and human-wildlife conflict where bison range overlaps agricultural land. The long-term goal of truly free-roaming populations on sufficient habitat remains distant in most regions. Balancing the welfare needs of individual animals with the conservation goals of population management requires ongoing ethical attention.