Play behaviour in farmed pigs is a reliable positive welfare indicator. Providing conditions that allow pigs to play — through space, enrichment, and social stability — is fundamental to high-welfare pig farming.
The presence of play behaviour in farmed pigs signals that their welfare needs are being sufficiently met — it is a positive welfare indicator rather than simply an absence of negative states. Farms where pigs routinely play have demonstrably better welfare outcomes: lower rates of tail biting, aggression, and stress-related behaviours. The conditions that enable play are interconnected: adequate space, stable social groups, physical enrichment, and good health are all prerequisites. Unfortunately, many intensive pig farming systems fail to meet these thresholds. Barren, concrete-floored environments with high stocking densities suppress play and promote redirected aggression. Providing straw or other rooting materials has been shown to increase play rates substantially. Tail docking — required because tail biting is common in barren systems — should become unnecessary when underlying welfare conditions that enable play are properly addressed.