Ammonia exposure in poultry housing causes respiratory disease, eye damage, and chronic welfare compromise in laying hens and broilers, making ventilation management and litter quality control essential welfare practices.
Ammonia exposure represents a chronic and pervasive welfare problem in commercial poultry housing that is frequently invisible to casual observation but causes measurable physiological and behavioral harm to affected birds. Poultry have sensitive respiratory systems and are continuously exposed to ammonia from the moment they begin contributing to the manure loading of their environment. At concentrations that exceed regulatory limits but may still occur in practice, ammonia causes progressive damage to the respiratory epithelium and corneal tissue, creating conditions for bacterial infection and reducing visual acuity. Behavioral changes including reduced feeding and activity reflect the discomfort of chronic low-level toxicological stress. Welfare-positive housing design prioritizes ventilation systems capable of maintaining ammonia concentrations below 10 ppm even under high-density winter conditions, combined with litter management practices that reduce ammonia generation at the source.