Cattle form strong social bonds that are disrupted by routine regrouping, causing stress and aggression with measurable welfare impacts in dairy and beef systems.
Social disruption from regrouping is a significant but often underappreciated welfare cost in dairy and beef farming. Every time familiar social partners are separated and unfamiliar animals mixed, there is an acute welfare cost of establishing new hierarchies through aggression and stress. Dairy cows may experience multiple regroupings per lactation cycle. Reducing the frequency of regrouping, maintaining stable social groups, and providing sufficient space during mixing events to allow avoidance behaviour all reduce welfare costs. Research consistently shows welfare and productivity benefits from stable social group management.