The transition from individual gestation stalls to group housing for pregnant sows is one of the most significant welfare improvements in UK pig production, but management quality determines actual welfare outcomes.
Group gestation housing represents genuine welfare improvement over individual stalls by allowing sows to move, express social behaviour, and maintain physical fitness. However, poorly managed group systems with inadequate space, inappropriate mixing, or insufficient feeding points can produce high aggression and poor welfare outcomes. Good management is the key determinant.