Influence of regrouping strategy on performance, behaviour and carcass parameters in pigs

The results of the present study show that there are benefits in forming uniform weight groups at 10 weeks of age, in terms of reducing within-group variability in weight at slaughter. However, regrouping at the start of the finishing period has negative welfare implications in terms of leading to increased aggression. It is suggested that future research should concentrate on reducing variability in growth during the growing period so that forming uniform weight groups at weaning reduces variability in weight at slaughter.