Play behavior in pigs is an important positive welfare indicator — its presence signals adequate behavioral opportunity and good welfare, while its absence suggests welfare deficit.
Play behavior in pigs is more than recreation — it is a welfare signal that reflects the adequacy of their environment and social conditions. Pigs in poor welfare conditions simply do not play: overcrowding, barren environments, and chronic stress suppress the positive affective states that motivate play. Conversely, pigs in enriched environments with adequate space regularly play in ways that produce positive vocalizations and behavioral diversity. Using play frequency as a welfare audit indicator — rather than only checking negative indicators like injuries and stereotypies — gives a richer and more complete picture of flock welfare. Systems that enable play are systems that enable good welfare.