Space allowance is one of the most extensively studied determinants of pig welfare. Scientific evidence consistently links higher space per pig with better welfare outcomes, guiding both regulation and higher welfare standards.
Space allowance in pig production represents a clear tension between welfare evidence and economic incentive. More space per pig means fewer pigs per facility — reducing output and increasing per-unit production cost. Yet the welfare evidence is unambiguous: crowded pigs are more aggressive, have more injuries, show more abnormal behaviour, and have higher tail-biting rates. Welfare-positive production systems invest in adequate space and accept the associated cost, recouping some of it through reduced injury treatment costs, lower medication use, and better growth performance. Higher welfare certification schemes typically require space allowances 25-50% above legal minimums, creating a meaningful welfare distinction that allows consumers to make informed choices.