Stereotypic behaviours in pigs indicate poor welfare and chronic frustration, and are more common in barren, restrictive housing systems.
Pig stereotypies develop when animals cannot perform highly motivated natural behaviours — especially rooting, exploration and social interaction. The behaviour becomes habitual and serves as a coping mechanism, but indicates underlying welfare failure. Barren environments with no rooting material are the primary driver. Welfare audit systems that assess stereotypy prevalence can identify farms with chronic housing welfare deficits. Prevention is far more effective than attempting to eliminate established stereotypies.