Environmental enrichment for pigs - providing objects and materials to investigate and manipulate - dramatically improves their welfare by allowing natural behavioral expression, yet remains absent in most intensive systems.
Pig enrichment research reveals that the behavioral needs of pigs are not met by token gestures like hanging chains. Pigs are highly motivated to root - to manipulate substrate with their snouts in search of food. This behavior occupies hours of their day in natural conditions and is driven by powerful instinct. Depriving pigs of rooting opportunities creates a state of chronic behavioral frustration analogous to sensory deprivation. The aggression, tail biting, and stereotypic behaviors endemic in unenriched systems are not character flaws of individual pigs but predictable responses to an environment that systematically prevents natural behavioral expression. Straw bedding - inexpensive and effective - transforms the behavioral state of housed pigs measurably.