Play behaviour in pigs is a reliable indicator of positive welfare states and is measurably more frequent in environments that meet their physical and social needs.
Play in pigs is not merely an anecdote — it is a validated welfare indicator that reflects positive affective state. Piglets that have adequate space, social companions, and interesting environments play extensively. Adults in enriched systems show social play, object play, and exploratory behaviour that indicates psychological wellbeing. In barren, overcrowded systems, play is absent or extremely rare — the motivation is present but the environment does not permit its expression. Welfare assessment systems that monitor play behaviour provide a more complete picture of farm welfare quality than physical health indicators alone, capturing the positive dimension that absence-of-suffering measures miss entirely.