Weaningâthe separation of young animals from their mothers and transition to independent feedingâis one of the most welfare-significant management events in livestock production. The stress of weaning has been extensively researched in cattle, pigs, and sheep, providing a strong scientific foundation for welfare-minimizing practices.
Weaning combines multiple simultaneous stressors: loss of maternal contact, cessation of milk, dietary transition, social regrouping, and often environmental change. Cortisol levels spike at weaning and remain elevated for days. Immune function is suppressed, increasing disease susceptibility. Behavioral indicatorsâvocalization, restless locomotion, reduced feed intakeâpersist for 1-5 days depending on species and method.
Abrupt weaning of beef calves causes 2-5 days of intense vocalization and reduced feed intake in both cows and calves. Fence-line weaning (cows and calves separated by fence but with contact through it) reduces vocalization, weight loss, and stress indicators compared to abrupt complete separation. Two-stage weaning (nose flaps preventing suckling but maintaining cow-calf contact, followed by separation) further reduces stress. Earlier weaning (before 6 months) is more stressful than weaning at 6-8 months when calves are more behaviorally independent.
Commercial pigs are typically weaned at 3-4 weeksâsignificantly earlier than natural weaning at 12-17 weeks. Earlier weaning increases stress, immune challenges, and post-weaning diarrhoea risk. Extended suckling (6-8 weeks) improves piglet welfare but reduces sow productivityâa genuine welfare-production trade-off that policy and market forces are beginning to address.
Part of the Animal Welfare Hub â 2395+ pages of evidence-based animal welfare information.