Weaning in commercial pig production is one of the most stressful events in a pig's life, separating piglets from their mother abruptly at 3-4 weeks and placing them in new, unfamiliar social environments.
The weaning period represents a concentrated welfare crisis for commercial piglets. Sudden maternal separation triggers behavioural distress responses — vocalisation, activity changes, and redirected suckling behaviours. Gut health deteriorates as the microbiome adapts to solid feed without the gradual transition natural weaning allows. Mixing with unfamiliar piglets from other litters results in fighting until social hierarchies are established. The combination of immune suppression, gut inflammation, and social stress creates a period where welfare is acutely compromised and disease vulnerability is highest. Interventions that reduce this stress — later weaning age, good creep feed introduction, careful mixing strategies, appropriate nutrition — have both welfare and production benefits, creating alignment between animal welfare and farm economics.