How play behavior in pigs signals positive welfare states and how producers can promote it to improve herd wellbeing.
Pig play behavior is a behavioral welfare indicator that reveals positive emotional states directly rather than merely the absence of negative experiences. The correlation between play frequency and optimistic cognitive bias, validated across multiple studies, establishes play as a marker of genuine positive welfare. Farms reporting high welfare standards can be evaluated against play behavior observations: if pigs in a system never play, the welfare claim is questionable regardless of other indicators. Providing conditions that enable play requires adequate space, enrichment, social stability, and freedom from chronic pain and stress. These are the same conditions that improve productivity, creating economic alignment with welfare improvement for producers willing to invest in understanding what positive pig welfare actually looks like.