Play behaviour in pigs is a reliable indicator of positive welfare states. Understanding what triggers and prevents play can guide improvements in pig housing and management.
Play is not a luxury behaviour in pigs — it is a barometer of welfare quality. Research has firmly established that pigs in good welfare conditions play spontaneously and frequently, while those in poor conditions suppress play even when they have the physical capacity for it. This makes play frequency a particularly valuable welfare indicator: it is relatively easy to observe and quantifies positive rather than merely negative welfare. Industrial housing systems — barren concrete or slatted floors, overcrowding, stable social groups with no novelty — systematically suppress play. The challenge for welfare improvement is providing the substrate, space, and social stability that allow play to emerge. Straw bedding, enrichment objects, and adequate space are among the most evidence-based interventions.