Pig Weaning Enrichment: Reducing Stress and Improving Welfare at a Critical Life Stage

Weaning is one of the most stressful events in a commercial pig's life. Enrichment strategies can significantly reduce distress and improve both welfare and production outcomes.

Key Facts

Commercial pigs are typically weaned at 21–28 days, far earlier than the natural weaning age of 12–17 weeks
Weaning combines simultaneous separation from the sow, social disruption, and a diet change
Post-weaning stress is associated with diarrhoea, immune suppression, reduced growth, and stereotypies
Belly-nosing — persistent rooting at pen-mates' flanks — is a common post-weaning redirected behaviour
Providing rooting material such as straw, peat, or compressed paper at weaning significantly reduces aggression
Familiar pen-mates and familiar bedding from the farrowing pen reduce the novelty stress of weaning
Playful enrichment objects — balls, chains, bite blocks — reduce redirected oral behaviours
Pigs weaned with access to enrichment show lower cortisol and better growth than those in barren pens

Welfare Considerations

Early commercial weaning imposes substantial welfare costs. Piglets separated from the sow before immunological and behavioural independence call persistently, show depressed activity, engage in belly-nosing and other redirected oral behaviours, and experience elevated cortisol for several days. Providing enrichment at weaning has robust welfare benefits: straw or rooting substrates allow pigs to express natural foraging behaviour, redirecting motivation away from pen-mates. Continuity of social groups from birth reduces the extra stress of meeting strangers on top of maternal separation. Foraging enrichment is particularly beneficial during the first 48–72 hours post-weaning when stress is highest. On systems where straw use is limited by slatted floors, alternatives like compressed paper, hanging ropes, or rooting balls provide meaningful stimulation. The welfare case for later weaning, where feasible, is strong: every additional week with the sow reduces post-weaning stress indicators significantly.

What You Can Do

Support welfare certification standards that mandate enriched weaning environments for pigs
Choose pork products certified to higher welfare standards including access to rooting materials
Advocate for legislative requirements for enrichment provision at and after weaning
Share evidence on weaning enrichment with farmers — improved welfare often accompanies better growth
Support research into practical low-cost enrichment solutions compatible with slatted floor systems
Encourage retailers to engage their pork supply chains on enrichment standards at weaning