Research on pig behavioral enrichment has produced clear evidence that environmental complexity significantly improves welfare by reducing aggression, stereotypic behavior, and injury rates.
Pig enrichment research has produced clear evidence that the specific type of enrichment matters enormously — a chain hanging from a hook satisfies minimum regulatory requirements but provides essentially no welfare benefit compared to rooting substrate that engages natural foraging drives. Pigs are rooting animals whose behavioral drive to dig and forage in substrate is fundamental to their species-typical behavior. Denying this drive in barren concrete environments while providing nominal enrichment items represents a regulatory compliance failure that misses the welfare point. Deep litter or straw-based systems that provide genuine rooting opportunity produce measurable welfare improvements including dramatically reduced tail biting and more natural behavioral repertoires. Progressive welfare standards are moving toward requiring functional enrichment that actually meets behavioral needs.