Hock burn and foot pad dermatitis in broiler chickens are validated welfare indicators directly linked to litter quality, providing measurable targets for welfare improvement programs.
Hock burn scoring represents one of the clearest examples of welfare science translating into practical, measurable welfare improvement at farm level. The causal pathway is well-established: wet litter causes ammoniacal dermatitis on leg joints, creating painful lesions that impair movement and feeding in already locomotion-compromised fast-growing birds. The measurability of hock burn - visible lesions that can be scored at slaughter using standardized systems - creates accountability that allows welfare auditors to identify poor performers and track improvement. The regulatory trigger in EU systems where hock burn above threshold levels requires management intervention represents welfare policy that works because it is tied to measurable outcomes rather than process compliance alone.