Farmed Animals

Farmed Pig Weaner Welfare and Post-Weaning Stress

Weaning piglets from sows at 3-4 weeks causes significant stress through simultaneous maternal separation, diet change, and mixing with unfamiliar pigs.

Key Facts

Commercial pigs are weaned at 21-28 days - far earlier than natural weaning at 12-17 weeks
Post-weaning stress causes diarrhea, growth check, aggression, and immune suppression
Early weaning is associated with stereotypies in later life including bar-biting and belly-nosing
Supplementing milk in pre-weaning period reduces dietary stress at weaning
Later weaning at 5-6 weeks significantly reduces post-weaning welfare problems

Welfare Considerations

The welfare cost of early weaning is multi-layered - the maternal separation itself causes acute distress, the dietary transition from milk to solid feed causes gastrointestinal upset, and mixing with unfamiliar pigs triggers fighting. Natural later weaning dramatically reduces all these stressors, but conflicts with the commercial pressure to return sows to the breeding cycle quickly.

What You Can Do

Support pork producers committed to later weaning ages as part of higher welfare standards
Advocate for minimum weaning age standards of at least 28 days in pig welfare legislation
Choose free-range or organic pork where dam-rearing practices are typically less intensive
Support research into management practices that reduce post-weaning stress in conventional systems