Research into pig enrichment has identified effective, practical interventions that reduce tail biting and improve welfare in commercial settings. Understanding the evidence helps producers and advocates.
Pig enrichment science has advanced from vague regulatory requirements to specific evidence-based guidance on what enrichment types actually improve welfare. The research consensus is clear: manipulable, organic, destructible materials — particularly straw, hay, wood, and other natural substrates — satisfy pigs' rooting, chewing, and investigative motivations in ways that non-destructible objects like hanging chains do not. Chains, ropes, and suspended objects without organic material provide minimal welfare benefit beyond brief novelty. Straw provision in barren systems has the strongest evidence base for reducing tail biting incidence — the primary welfare problem it addresses. However, straw is often impractical in fully slatted floor systems due to slurry management constraints. Alternative enriching materials including wood blocks, compost, and novel objects require regular rotation to maintain stimulation as pigs rapidly habituate to familiar enrichments. Regulatory updates incorporating specific enrichment quality standards would prevent the widespread industry practice of providing ineffective token enrichment.