Play behavior in pigs is a reliable indicator of positive welfare states and is measurably reduced by poor housing conditions.
Pig play behavior has moved from a curiosity to a practical welfare assessment tool. Because play requires a surplus of positive affect — animals do not play when stressed, hungry, or ill — its presence is a reliable signal of welfare adequacy. Welfare assessors using the Welfare Quality protocol for pigs include play observation as one of their behavioral indicators. Farms that score well on play frequency tend to score well across other welfare indicators, making it a useful proxy measure. The implication for farm design is clear: creating environments where pigs actually play — through enrichment, adequate space, and good health management — means creating environments where pigs genuinely thrive rather than merely survive.