Stocking Density and Animal Welfare: The Evidence

Stocking density — the number of animals per unit area — is one of the most important determinants of welfare in farmed species, with clear welfare thresholds across species.

Key Facts

EU broiler regulations allow up to 42 kg per square metre — significantly reducing space at slaughter weight
RSPCA Assured broilers must not exceed 30 kg per square metre
Dairy cattle in loose housing require at least 5-6 square metres per cow for unrestricted movement
Pig space allowances under EU law often fall below recommended welfare thresholds
Higher stocking density consistently increases cortisol, aggression, and disease in all farmed species

Welfare Considerations

Overcrowding forces animals to compete for food, water, resting areas, and ventilation. Higher density increases disease transmission and injury from competition. Broilers at legal maximum density cannot avoid contact and cannot perform wing-spreading. Overcrowded pigs redirect foraging to tail biting. Cattle in crowded spaces cannot lie down simultaneously in synchronised herds. Reducing stocking density is consistently the highest-impact welfare intervention identified in comparative studies across species.

What You Can Do

Choose products from certification schemes with specific stocking density limits
Support the Better Chicken Commitment's maximum 30 kg per square metre standard
Advocate for stocking density reductions in European farm animal welfare legislation
Engage with food companies about supply chain stocking density monitoring
Support research into minimum stocking space requirements across farmed species