Research on pig enrichment has identified effective and ineffective strategies, enabling evidence-based enrichment provision that genuinely reduces welfare problems rather than providing nominal compliance.
Pig enrichment research has provided clear actionable guidance that remains poorly implemented in commercial pig production because the most effective enrichments (organic rooting materials) are also the most operationally challenging. Chains, rubber hoses, and suspended ropes are technically compliant with minimum welfare requirements but consistently fail to reduce tail biting at commercially meaningful levels. The evidence is unambiguous: pigs need to root and manipulate substrates, and only materials that provide this opportunity effectively meet that need. The implementation gap between research evidence and farm practice reflects economic disincentives - straw-based systems cost more to manage than slatted floors with hanging objects - that welfare regulations with substantive rather than nominal enrichment requirements could address.