Broiler Litter Quality and Ammonia Welfare Effects

Poor litter quality in broiler houses generates harmful levels of ammonia and causes contact dermatitis, respiratory disease, and significant pain in chickens raised for meat.

Key Facts

Ammonia from broiler litter damages respiratory tissue and eye health above 25 parts per million
Contact dermatitis causing hock burns affects up to 80% of birds in some intensive systems
Foot pad dermatitis from wet litter causes pain that alters gait and reduces movement
European welfare regulations set maximum ammonia levels and hock burn prevalence thresholds
Litter quality depends on ventilation, stocking density, drinker design, and litter material
Lower stocking densities and better ventilation reliably improve litter quality and welfare outcomes
Some producers now report hock burn prevalence as a welfare transparency measure to retailers

Welfare Considerations

Hock burns and foot pad dermatitis are visible, measurable indicators of poor litter conditions and represent genuine painful injuries rather than cosmetic concerns. Birds with severe foot pad lesions show reduced walking, altered foraging behavior, and behavioral indicators of pain. Ammonia damage to respiratory tissue is cumulative and causes chronic discomfort throughout the production cycle. Both problems are preventable with adequate stocking density, ventilation management, and litter maintenance — making their prevalence a measure of management commitment to welfare. Retailer pressure on hock burn scores has proven effective in driving industry improvement.

What You Can Do

Choose chicken products from producers with low hock burn prevalence commitments
Support legislation setting maximum stocking densities and minimum ventilation standards
Encourage supermarkets to publish supplier hock burn score data transparently
Reduce chicken consumption and favor higher-welfare alternatives when purchasing
Support research on litter management innovations that maintain quality at scale