Poultry Ammonia Exposure and Eye Welfare

Ammonia from poultry litter causes eye damage in birds at levels common in poorly managed poultry buildings, causing chronic ocular welfare compromise in millions of individuals.

Key Facts

Ammonia concentrations above 20 ppm cause tearing, corneal ulceration, and blindness in poultry over prolonged exposure.
Broiler chickens commonly spend their entire 5-7 week life in buildings with ammonia levels that damage eye and respiratory tissue.
Keratoconjunctivitis from ammonia exposure was found in 49-70% of broilers in some survey studies.
Litter management reducing wet spots and manure accumulation is the primary tool for ammonia reduction at source.
Ventilation system design and management determines ambient ammonia levels independently of litter quality.

Welfare Considerations

Ammonia-induced eye damage in commercially farmed poultry is a welfare problem of enormous scale that affects individual birds continuously throughout their production life. Corneal ulceration and conjunctivitis cause chronic pain and vision impairment in birds that have no means of escaping the source of their suffering. Regulatory maximum ammonia limits exist but enforcement is minimal. Consumer and retailer pressure for audited air quality management is currently the most effective lever for improvement.

What You Can Do

Support poultry certification schemes that include ammonia level monitoring requirements in their standards.
Advocate for regulatory enforcement of maximum ammonia concentration limits in commercial poultry buildings.
Choose certified poultry products from operations that publish air quality management standards.
Reduce poultry consumption and shift to plant-based alternatives to reduce demand from high-ammonia intensive systems.