Welfare of Pigs During Weaning — Stress and Aggression

Early weaning of piglets in commercial production causes significant welfare problems through stress, immune suppression, and aggression when mixed with unfamiliar pigs.

Key Facts

Commercial pigs are typically weaned at 21 days — wild boar wean at 17 weeks
Early weaning disrupts the natural nursing bond and causes measurable stress responses in piglets
Post-weaning diarrhoea kills thousands of piglets annually and is linked to immune suppression at weaning
Mixing unfamiliar piglets at weaning triggers intense aggression (mixing of litters)
Tail biting in weaned pigs is a major welfare problem linked to boredom, competition, and stress
EU regulations set a minimum weaning age of 28 days with some exceptions — UK follows similar rules
Some high-welfare systems allow piglets to wean naturally at 6-8 weeks

Welfare Considerations

The welfare cost of early weaning is substantial. Piglets removed from their mothers at three weeks experience a sudden loss of warmth, nutrition, immune support, and social stability. The resulting immune suppression creates vulnerability to disease. Mixing with unfamiliar litters triggers aggression — sometimes severe and persistent. The solution is well established: later weaning, keeping litter groups together at weaning, enriched environments to reduce redirected behaviours, and avoiding tail docking through enrichment-based alternatives. Higher welfare production systems demonstrate these improvements are commercially viable.

What You Can Do

Choose pork from higher welfare certified systems where weaning age is extended
Support welfare legislation mandating minimum weaning ages
Advocate for enriched housing to reduce post-weaning aggression and tail biting
Reduce pork consumption if welfare standards cannot be verified
Support the phasing out of routine tail docking linked to early weaning stress