Play behavior in pigs is a reliable indicator of positive welfare and understanding what promotes or inhibits play informs better housing and management design.
Play is a behavioral window into positive welfare states. Pigs that play are expressing adequate physical health, social comfort, and psychological wellbeing — the conditions that good welfare requires. Conversely, the disappearance of play is an early and sensitive indicator that something is wrong: pain, fear, nutritional deficiency, and social stress all suppress play before causing more obvious welfare problems. This makes play observation a practical and powerful tool for welfare monitoring on farms. Housing designs that enable locomotor play — sufficient space, social groups, varied substrates — simultaneously produce pigs that play more and score better across welfare assessment frameworks. Investing in play-enabling environments is investing in welfare.