Pigs have a profound behavioral need to root and forage that is systematically frustrated in intensive farming, and providing rooting materials dramatically improves welfare.
The frustration of rooting motivation in barren intensive pig housing creates chronic psychological distress expressed through stereotypic behaviors including bar-biting, empty-jaw chewing, and rooting on pen-mates. These behaviors occur at high frequency in barren environments and indicate persistent welfare compromise. Research consistently shows that pigs provided with rooting substrates are calmer, less aggressive, and show fewer stereotypies. The provision of adequate rooting material is one of the most evidence-based, cost-effective welfare improvements available to pig producers.