Poultry Litter Quality: Ammonia, Footpad Dermatitis, and the Welfare Link

Litter quality in poultry sheds is a critical welfare determinant. Wet, ammonia-saturated litter causes painful skin lesions and respiratory damage affecting the majority of intensively farmed birds.

Key Facts

Footpad dermatitis (FPD) — ulcerative lesions on the foot pads caused by contact with wet, ammonia-rich litter — affects 50–80% of broiler chickens in intensive systems at slaughter.
FPD is used as a welfare indicator at slaughter in several EU countries; severe lesions indicate birds spent extended periods on inadequate litter.
Ammonia concentrations above 25 ppm in poultry sheds cause eye and respiratory irritation; many commercial sheds exceed 50 ppm during wet conditions.
Chronic low-level ammonia exposure causes airway inflammation, reduced immune function, and increased susceptibility to respiratory pathogens.
Litter quality is managed through stocking density, ventilation, drinker design, and litter amendments (zeolite, acidifying agents) — all within producer control.
UK regulations require litter monitoring and intervention when FPD exceeds threshold levels; the link between litter quality monitoring and welfare improvement is documented.

Welfare Considerations

Litter quality is one of the most tractable farm animal welfare problems: the cause (wet, ammonia-rich litter), the welfare consequences (footpad lesions, respiratory disease, eye irritation), and the solutions (ventilation, drinker management, stocking density) are all well understood. FPD causes pain — affected birds show gait changes and reduced locomotion consistent with discomfort. Ammonia exposure at commercial concentrations causes chronic mucosal irritation. The prevalence of these conditions — affecting the majority of intensively farmed broilers — makes litter quality one of the highest-impact targets for welfare improvement across the industry. Slaughter-based monitoring programmes that link litter quality scores back to individual farms create accountability and measurable improvement incentives.

What You Can Do

Support certification schemes that include litter quality monitoring and FPD scoring as audit conditions.
Advocate for mandatory slaughter-based FPD monitoring with farm-level feedback in all major poultry-producing countries.
Engage food companies about supplier litter quality standards and whether they audit FPD prevalence.
Choose poultry from certified welfare schemes that include environmental quality requirements beyond minimum legal standards.
Support research into litter amendment technologies that reduce ammonia and improve litter quality without additional antibiotic use.