Pig Space Allowances: What Welfare Science Recommends

The space provided to pigs in commercial housing systems directly affects their welfare — ability to move, perform natural behaviours and avoid aggression all depend on adequate space.

Key Facts

UK legal minimum space for growing pigs is 0.4-0.65 square metres depending on weight
RSPCA Assured requires 0.5-0.85 square metres — 20-30% more than the legal minimum
At legal minimums, pigs cannot simultaneously stand and lie without overlapping
Research shows tail biting and aggression rates decrease as space increases above minimum
Group size also matters — smaller groups have lower aggression at equivalent space allowances

Welfare Considerations

Space allowance affects every aspect of pig welfare — freedom of movement, ability to thermoregulate by moving between areas, feeding competition, and expression of natural exploratory and play behaviour. At legal minimums, pigs in commercial systems are physically cramped and behaviourally restricted in ways that welfare science clearly identifies as welfare-compromising. Higher-welfare certification schemes that require more space deliver measurably better welfare outcomes that are visible in animal-based indicators.

What You Can Do

Choose RSPCA Assured pork which mandates higher minimum space standards
Advocate for minimum space allowance increases in UK pig welfare regulations
Support farms that voluntarily exceed minimum space requirements with better-welfare products
Back research into optimal group size and space combinations for commercial pig welfare
Engage with Compassion in World Farming on pig space advocacy at EU and UK level