Farmed Chicken Litter Quality: Ammonia and Welfare

Poultry litter quality directly affects broiler welfare through ammonia exposure, footpad dermatitis risk, and respiratory health. Managing litter moisture is a high-impact welfare intervention.

Key Facts

Ammonia from litter decomposition causes respiratory irritation, eye damage, and reduced growth rate at concentrations above 20ppm
Footpad dermatitis (FPD) affects up to 50-80% of broilers in some UK flocks, caused by contact with wet, caustic litter
UK welfare standards require FPD monitoring through slaughterhouse footpad scoring programmes
Ventilation management that controls moisture without creating cold draughts is the primary litter quality management tool
Litter amendments including lime, diatomaceous earth, and acidifying products can improve litter condition
First-week moisture control is critical: wet litter in the first week causes permanent FPD lesions that persist through the production cycle

Welfare Considerations

Litter quality represents one of the most directly controllable welfare factors in broiler production. Wet, high-ammonia litter causes multiple simultaneous welfare harms: FPD lesions are painful and reduce mobility; ammonia irritates respiratory and ocular mucosa causing chronic discomfort; bacteria in wet litter increase respiratory disease risk. The interconnection means that improving litter quality delivers welfare benefits across multiple health indicators simultaneously. The critical control period is the first week of life: brooder areas with wet litter in the first week cause FPD that persists regardless of subsequent litter quality improvement. Drinker management (preventing leaks) and ventilation that removes moisture without temperature compromise are the primary interventions. Commercial incentives for litter quality improvement exist through slaughterhouse FPD scoring schemes that can impose penalties on farms with high rates of severe FPD.

What You Can Do

Support welfare-certified chicken from farms with documented FPD monitoring and management
Advocate for mandatory slaughterhouse FPD scoring and public reporting for all UK broiler flocks
Choose chicken from farms meeting EBA standards that include litter quality requirements
Support research into improved litter amendment products and application protocols
Ask poultry producers and retailers about their FPD rates and litter management practices
Reduce broiler chicken consumption or substitute with products from better-managed welfare systems