Broiler Chicken Litter Quality: Ammonia and Footpad Health

Litter quality in broiler houses directly determines footpad health, respiratory welfare, and immune function — with poor litter management causing preventable suffering across billions of broiler chickens annually.

Key Facts

Ammonia from litter reaches concentrations of 25-50 ppm in many commercial broiler houses — above the 20 ppm welfare threshold
Footpad dermatitis (FPD) caused by wet litter contact affects 30-80% of commercial broilers with graded severity
Severe FPD lesions (grade 3-4) cause lameness and are associated with reduced walking ability and access to feed and water
EU broiler directive (2007/43/EC) requires FPD monitoring at slaughter — farms with high prevalence must reduce stocking density
Litter management interventions include adequate ventilation, controlling drinker leakage, and partial litter refreshing during the cycle
Wood shavings litter has better moisture-absorbing properties than recycled materials when fresh, but quality varies by source

Welfare Considerations

Broiler litter welfare reflects a cascade from management inputs (ventilation, stocking density, water provision) through intermediate outcomes (litter moisture, ammonia concentration) to animal welfare impacts (FPD, respiratory health, immune function). Wet, ammoniated litter does not merely cause footpad lesions — the ammonia concentration affects the entire respiratory tract, causing tracheal and pulmonary irritation that impairs immune responses and increases susceptibility to respiratory pathogens. The welfare cost of breathing ammonia at 50 ppm concentrations for 5-6 weeks of the broiler's entire life is substantial. Footpad dermatitis grading at slaughter provides a systematic, population-level welfare indicator that cannot be manipulated — lesion scores from slaughter plants are honest reflections of in-house welfare conditions. Regulatory use of slaughter FPD data to impose stocking density reductions on high-prevalence farms has demonstrably driven litter quality improvement in jurisdictions where enforcement is consistent.

What You Can Do

Choose chicken from producers with low documented footpad dermatitis rates at slaughter
Support mandatory FPD monitoring and published results as a welfare accountability mechanism
Advocate for maximum ammonia concentration limits in broiler house welfare regulations
Support the Better Chicken Commitment which includes litter quality and FPD outcome requirements
Reduce chicken consumption from conventional systems with no welfare assurance or outcome data