A growing body of research demonstrates that enrichment dramatically improves pig welfare in commercial settings, with straw, rooting materials, and novelty consistently showing positive behavioral and physiological effects.
The science of pig enrichment has advanced substantially over the past two decades, providing strong evidence that environmental complexity is a fundamental welfare need rather than an optional extra. Pigs are highly motivated to root and manipulate materials — studies using preference tests show they will work hard to access rooting material even when alternatives are available. In barren environments, this frustration drives the redirected oral behaviors including tail biting that cause significant injury in commercial herds. The welfare case for enrichment is compelling: it reduces suffering from boredom and frustration, decreases injury from redirected aggression, and promotes the expression of natural behavioral repertoires. The challenge is implementation in intensive systems where straw management creates practical difficulties — but alternatives including hanging ropes, sprayed compost, and rooting boxes have shown efficacy.