Early weaning of piglets is standard practice but causes acute stress. Understanding the welfare impacts guides better management.
Early weaning causes acute psychological and physiological stress for both sow and piglets. The natural weaning process in wild pigs is gradual over months - the abrupt separation standard in commercial production causes immediate, intense distress responses including calling behaviors in both parties. Piglets that begin suckling pen mates (belly nosing) are demonstrating the persistence of the nursing drive despite there being nothing to satisfy it. Post-weaning diarrhea from the combined stress of maternal separation, dietary change, and environmental change causes pain and can be fatal without intervention. Later weaning, gradual dietary transition with creep feeding, and low-stress handling at weaning represent a welfare-positive package that also improves production outcomes.