Observing and supporting play behavior in pigs provides direct evidence of their capacity for positive emotional states and can serve as a practical welfare metric.
Play behavior in pigs is among the most compelling evidence that farm animals have positive emotional states worth actively cultivating. Research has documented that pigs in good welfare conditions initiate play spontaneously, displaying locomotor play, social play, and object play. These behaviors are biologically costly, occurring only when animals are in a positive state with resources to spare. Welfare assessment systems that include play frequency as an indicator are measuring something fundamentally important: whether pigs are experiencing life as worth living. Environments designed to enable play require enrichment, appropriate space, good health management, and social stability.