Play behavior in pigs is a reliable indicator of positive welfare states, and its frequency and nature provides a measurable window into overall farm pig wellbeing that production metrics cannot capture.
Pig play is not merely entertaining — it is scientifically validated as a reliable indicator of positive emotional states. When pigs play, they are signaling that their welfare needs are being met sufficiently to permit energy investment in non-essential behavior. The absence of play in production systems is therefore informative: pigs in barren, overcrowded environments with chronic stress cannot afford the energy and vulnerability of play. Monitoring play behavior at the flock level provides a positive welfare metric that complements the negative indicators — lameness, disease, injury — that dominate most welfare assessment schemes. A future in which play frequency is a reportable welfare metric would represent significant progress.