How weaning age affects pig welfare outcomes and evidence-based approaches to reducing weaning transition stress.
Weaning stress is a predictable welfare harm in commercial pig production that results from the combination of maternal separation, nutritional transition, and social disruption that typically occur simultaneously. Each of these stressors alone causes welfare compromise; combined they create the post-weaning dip in welfare that the industry recognizes primarily through its economic costs rather than its animal welfare significance. Practical welfare improvements include later weaning where economically feasible, creep feeding that habituates piglets to solid food before separation, keeping sibling groups together at weaning, and providing high-quality highly digestible feeds that support gut health through the transition. The economic costs of post-weaning diarrhea create business alignment with welfare improvements that reduce disease incidence.