Stocking density in broiler production directly determines how much space each chicken has to move, rest, and express natural behaviour. Understanding the welfare science of stocking density supports better standards and sourcing decisions.
Stocking density is a foundational welfare parameter in broiler production because it determines whether birds have adequate space to move freely, access resources, rest without being walked over, and escape dominant individuals. At commercial maximum densities, the shed floor is essentially covered with birds - movement is severely restricted, litter deteriorates rapidly, and ammonia levels rise, causing eye and respiratory irritation. Lower stocking densities alone do not guarantee good welfare - breed, lighting, enrichment, and management all matter - but they are a necessary precondition for welfare improvement. The economic pressure to maximise birds per square metre creates a structural conflict between producer efficiency and bird welfare that requires regulatory intervention to resolve.