Play behavior in pigs is a reliable indicator of positive welfare states, and enrichment that promotes play is now recognized as an important goal in progressive pig farming.
Animal welfare science has shifted from a purely negative focus (preventing suffering) to also promoting positive experiences. Play is one of the clearest behavioral indicators of a positive internal state in pigs. Farms that provide enrichment — straw, suspended chains, wooden toys, foraging substrate — see more play behavior, less aggression, and better welfare outcomes. Importantly, novelty is key: rotating enrichment items regularly sustains interest and play. Research by Melissa Bateson and others shows that positive welfare indicators like play correlate with dopaminergic reward system activation — suggesting pigs genuinely enjoy these activities. Progressive welfare standards now require enrichment that demonstrably elicits play.