Access to outdoor environments significantly improves the welfare of farmed pigs by enabling natural behaviors that cannot be expressed in confinement systems.
Confinement in barns without outdoor access restricts the natural behavioral repertoire of pigs profoundly. Rooting, foraging, and exploring are highly motivated behaviors that pigs will work hard to perform. When denied these outlets, pigs redirect behaviors toward pen mates, leading to tail-biting, aggression, and chronic stress. Outdoor access addresses multiple welfare domains simultaneously: it provides environmental complexity, enables social group formation, improves physical health, and supports positive emotional states. Higher welfare certification schemes increasingly require meaningful outdoor access as a fundamental standard rather than an optional enhancement.