Early weaning of piglets in commercial pig production causes significant welfare harm, and management strategies can substantially reduce this distress.
Commercial pig weaning creates a convergence of welfare challenges in a short period: abrupt maternal separation, social disruption from mixing litters, and an abrupt dietary transition — all imposed simultaneously at a developmentally sensitive stage. The acute distress of weaning manifests in redirected suckling behaviors, aggression, and post-weaning diarrhea linked to stress-induced gut and immune disruption. Management improvements can substantially reduce this welfare impact: maintaining litter groups after weaning, providing weaning enrichment, pre-weaning creep feed access, and extending weaning age where economically viable. Later weaning age is the most impactful single change — each week of additional nursing time reduces stress and improves health outcomes.