Litter quality in broiler and turkey production directly determines foot health, skin condition, and overall welfare outcomes. Footpad dermatitis (FPD) is a key welfare indicator used in European monitoring schemes and correlates strongly with litter moisture content.
FPD—lesions on the plantar surface of the foot caused by wet litter contact—is scored at slaughter and used as a farm-level welfare indicator in Nordic countries and increasingly across Europe. Prevalence and severity directly reflect on-farm litter management quality. Severe FPD is painful, limits mobility, reduces feeding behaviour, and indicates chronic welfare compromise throughout the production cycle.
Broiler and turkey houses produce significant moisture through respiration, excreta, and drinker spillage. Litter moisture above 25-30% drives FPD development. Moisture sources include: drinker leakage (nipple drinkers reduce spillage compared to bell drinkers); poor ventilation inadequately removing humidity; high stocking density increasing excreta load; and intestinal disease increasing wet faeces. Identifying and controlling moisture sources is the primary welfare intervention.
Softwood shavings are the gold standard litter material, providing good absorbency, cushioning, and friability. Rice hulls, chopped straw, and sand are alternatives with variable welfare performance. Reused litter from previous flocks can reduce costs but carries pathogen and ammonia loading that compromises welfare if inadequately treated. Fresh litter placement and removal of caked material between flocks sets welfare conditions for each new batch.
Adequate ventilation removes humidity, excess heat, and ammonia while maintaining temperature within the thermal comfort zone. Minimum ventilation rates based on bird age and environmental conditions prevent humidity accumulation. Tunnel ventilation in summer and controlled side-wall ventilation in transitional seasons balance temperature management with moisture removal. Poorly managed ventilation is a primary driver of welfare problems across broiler production globally.
Ammonia produced by bacterial decomposition of uric acid in litter causes respiratory irritation, keratoconjunctivitis, and impaired immune function in poultry. Ammonia levels above 10 ppm chronically compromise welfare; acute exposure above 25 ppm causes severe respiratory distress. Adequate ventilation, appropriate stocking density, and litter management maintain ammonia within welfare-acceptable limits.
Daily litter assessment enables early intervention when moisture increases. Crust breaking, partial litter removal, and increased ventilation are responsive management tools. Litter conditioning products (acidifiers, absorbents) provide additional tools. Recording litter condition at depopulation and correlating with slaughter welfare data creates farm-level feedback loops driving continuous improvement.