Research into positive emotional states in pigs has advanced significantly, with play behavior, anticipatory responses, and ultrasonic vocalizations providing measurable welfare indicators.
The science of positive pig emotions has transformed our ability to assess welfare beyond simply measuring absence of suffering. Pigs experiencing genuinely positive emotional states show measurable behavioral signatures including play behavior, positive anticipatory responses, and characteristic vocalization patterns. These indicators provide actionable welfare metrics: farms where pigs rarely play or show positive anticipation have a welfare problem that environmental modification can address. The positive emotion research also strengthens the ethical case for pig welfare improvement by demonstrating that pigs have rich emotional lives worth protecting, not just pain systems worth suppressing. Welfare certification is increasingly incorporating positive welfare indicators alongside traditional negative welfare measures.