Early weaning of piglets from sows is standard in commercial pig production but causes significant welfare harm to both sows and piglets.
Early weaning is one of the starkest examples of welfare being sacrificed for production efficiency. The 3-4 week commercial weaning age is driven by economics - earlier weaning means sows return to reproductive cycling sooner, increasing annual litter output. But natural weaning at 12-17 weeks reflects the biological timeline of both sow and piglet physiology. Piglets weaned at 3-4 weeks are physiologically immature, have underdeveloped gut immunity and lack behavioral competence for the social challenges of mixing with unfamiliar piglets at weaning. The resulting stress, diarrhea and disease represent both welfare failure and economic costs - antibiotic use post-weaning is a major driver of antimicrobial resistance in pig production. Extended weaning is both a welfare improvement and a public health benefit.