Scientific research into pig space requirements has revealed that current commercial standards fall well below what pigs need to express normal behavior and maintain good welfare.
The scientific evidence on pig space requirements reveals a significant gap between commercial practice and animal needs. Preference testing - allowing pigs to choose between different space allowances - consistently shows selection of substantially more space than legislation requires. The inability to adopt preferred lying postures in standard commercial space is itself a chronic welfare compromise. The link between inadequate space and both aggression and tail biting indicates that space allowance is not simply a comfort issue but a welfare problem with measurable consequences for injury risk. The welfare case for higher space allowances is strong, but the economic implications of reducing stocking density create resistance to change. Certification scheme requirements for higher space represent progress but cover only a small fraction of commercial production.