The evidence base for minimum space allowances for broiler chickens is well established. Stocking density affects litter quality, air quality, leg health, and behaviour, with clear welfare benefits at lower densities.
Key Facts
EU maximum stocking density for broilers is 33 kg/m2 with conditions allowing up to 42 kg/m2
UK regulations follow the EU baseline with similar provisions for higher density under enhanced management
Higher welfare standards including RSPCA Assured require maximum 34 kg/m2
Evidence consistently shows lower stocking densities reduce leg disorders, FPD, and mortality
At high densities, chickens spend more time lying and less time feeding, drinking, and exploring
Litter quality degrades faster at high stocking densities due to higher moisture and ammonia accumulation
The Better Chicken Commitment recommends maximum 30 kg/m2 as part of a comprehensive welfare package
Economic analysis suggests the welfare cost of high density is partially offset by reduced energy use per kg of meat
Welfare Considerations
Stocking density is one of the most manipulable and evidence-based welfare levers in broiler production. The relationship between density and welfare is dose-dependent - lower density consistently produces better welfare outcomes across multiple measures. The resistance to reducing stocking density is primarily economic rather than technical. Certification schemes that specify density limits create market differentiation that allows higher welfare to be commercially rewarded. Consumer choices that support lower-density certified products provide the market signals needed to drive industry-wide improvement.
What You Can Do
Choose chicken from farms certified at maximum 30 kg/m2 or lower under higher welfare schemes
Support the Better Chicken Commitment by choosing from retailers who have signed up
Advocate for reduced maximum stocking density in EU and UK regulations based on the evidence base
Learn about stocking density research to understand why lower density consistently improves broiler welfare