Weaning in commercial pig production typically occurs at 3-4 weeks of age, far earlier than the natural weaning age of 12-17 weeks, causing acute and prolonged welfare impacts on piglets and sows.
Weaning represents one of the most acute welfare disruptions in commercial pig production. Piglets simultaneously lose their mother, their familiar littermates, their home environment, and their primary food source. Each of these losses alone would be stressful — combined, they create a welfare crisis compressed into a single event. Sows also experience distress at separation, particularly in the first 24-48 hours. Post-weaning disease risk peaks because the abrupt dietary and social change compromises immunity at the same time piglets are exposed to new pathogens in mixing facilities. Welfare improvements — later weaning, slower dietary transition, avoiding litter mixing at weaning, and maintaining social continuity — reduce these harms while also reducing antibiotic dependence and improving survival rates.