Pig Post-Weaning Stress: Management and Welfare

Weaning in commercial pig production involves abrupt separation from the sow at 21-28 days, causing acute stress responses that have lasting effects on health, immune function and welfare.

Key Facts

Commercial weaning typically occurs at 21-28 days - in wild pigs, weaning occurs at 12-14 weeks
Post-weaning diarrhoea (PWD) is one of the most significant welfare and economic challenges following early weaning
Pigs show acute stress responses at weaning including vocalisations, restlessness, and reduced feed intake for 2-4 days
Creep feeding (providing solid food before weaning) reduces post-weaning gut adaptation challenges
Later weaning ages (beyond 28 days) significantly reduce post-weaning stress and improve welfare outcomes

Welfare Considerations

Post-weaning stress is an inherent consequence of early artificial weaning at ages when piglets are physiologically and psychologically dependent on the sow. The acute stress period is followed by chronic challenges including immune suppression, gut dysbiosis and competition-related injuries in the post-weaning pen. Welfare improvement requires later weaning ages where possible, creep feeding to prepare the gut, enrichment in the post-weaning pen to redirect investigative behaviour, and mixing management that minimises aggression. Reducing antibiotic use at weaning (which has become common management practice) requires addressing the underlying welfare and husbandry problems rather than chemical suppression.

What You Can Do

Support farm assurance schemes with minimum weaning age requirements
Advocate for later minimum weaning ages in commercial pig production regulations
Choose pork from farms with documented high welfare weaning practices
Support research into management practices that reduce post-weaning stress without antibiotics