Commercial pig farming typically weans piglets at 3 to 4 weeks of age, far earlier than natural weaning at 12 to 17 weeks, creating significant welfare challenges from behavioral deprivation, nutritional transition stress, and immune system immaturity.
Early weaning represents one of the most significant behavioral welfare interventions imposed on commercial pigs because it abruptly terminates the nursing relationship that is developmentally, nutritionally, and behaviorally central to piglet life in the first weeks. The strong nursing motivation persists well beyond the point of commercial weaning, and piglets denied this outlet redirect suckling behavior toward pen mates in ways that can cause ear and belly injuries. The immunological consequences of early weaning are also significant: piglets removed from maternal milk lose a source of passive immune support at a time when their own immune systems are still developing, increasing vulnerability to enteric pathogens. Extending weaning age even modestly to 5 or 6 weeks, combined with good creep feeding programs and low-stress weaning environments, meaningfully reduces these welfare impacts while remaining commercially viable for well-managed farms.