Litter quality in broiler chicken houses is one of the most important welfare parameters, with wet or caked litter causing painful foot pad dermatitis and hock burns in millions of birds.
Litter quality represents a case where welfare, economics, and regulation intersect in complex ways. FPD causes genuine chronic pain - birds with severe lesions show gait abnormalities, pain behaviour, and reduced movement that affects feeding and drinking access. The condition is largely preventable through management: appropriate stocking density allows better litter aeration, good ventilation reduces moisture, and functional nipple drinkers prevent water spillage. The monitoring system at slaughter plants that links FPD rates back to farms of origin creates an incentive structure for welfare improvement. However, the current regulatory thresholds permit FPD levels that animal welfare scientists consider unacceptably high. Raising monitoring thresholds to trigger farm action would directly reduce suffering in millions of birds.