The substantial welfare benefits of outdoor access for pigs and the evidence base supporting outdoor and free-range farming systems.
The case for outdoor pig welfare is compelling and well-evidenced. Pigs are intelligent, highly motivated animals whose natural behavioral repertoire — rooting, foraging, wallowing, exploring social groups — is almost entirely suppressed in intensive confinement systems. Outdoor access allows pigs to express these core behaviors, dramatically reducing the boredom, frustration, and redirected aggression that characterize confined systems. Welfare indicators consistently favor outdoor systems on behavioral measures, while trade-offs exist around some health parameters in certain disease contexts. The most welfare-progressive production systems provide outdoor access alongside protection from extreme weather, disease management, and social housing in stable groups — conditions that allow pigs to live as the cognitive and social animals they are.