Research has demonstrated that pigs experience positive emotional states — optimism, anticipation, and play-related joy — that are measurable and responsive to management conditions. Promoting positive emotions is a frontier of farm animal welfare science.
Positive emotion science in pigs represents a genuinely new frontier in farm animal welfare. Demonstrating that pigs not only suffer but experience joy, optimism, and anticipation fundamentally changes the welfare obligation from harm prevention to flourishing promotion. The measurement tools — judgment bias tests, play behavior scoring, acoustic monitoring of vocalization frequencies — are increasingly applicable in farm settings. Operations that score highly on positive emotion indicators consistently have better management practices across other welfare domains. Positive emotion science is also practically useful: it provides earlier warning of welfare deterioration than disease indicators and more nuanced assessment than clinical health metrics alone.