Space allowance for pigs affects welfare through expression of natural behaviours, social interactions and physical activity - evidence-based minimum standards lag behind welfare science findings.
Pig space allowance welfare research consistently shows that minimum legal standards fall below what pigs prefer and need for optimal welfare. Preference testing - where pigs choose between different space allocations - shows clear preference for more space than current minimums. Higher space allowances improve welfare through multiple pathways: reduced aggression, better litter quality, improved leg health from more movement, and lower ammonia from better manure management. The welfare case for higher space requirements is strong. The implementation challenge is economic - higher space allowances mean fewer pigs per barn and higher per-pig costs that must be recovered through premium prices. Consumer willingness to pay for welfare-assured products is essential.