Managing livestock in stable social groups reduces aggression, stress, and injury while enabling natural social behavior expression.
Social stress from group instability is one of the most significant and preventable welfare problems in intensive livestock systems. In pigs, merging unfamiliar individuals triggers intense fighting that causes skin wounds, ear damage, and psychological distress lasting days. In cattle, introduction of new individuals to established groups disrupts social order and increases competitive behaviors at feed and water points. Systems that maintain stable social groups from weaning to slaughter, and that manage group composition changes carefully when unavoidable, substantially reduce social stress throughout the production cycle.