Ammonia from accumulated manure in poultry houses causes chronic respiratory disease, eye damage, and pain in billions of chickens, representing an invisible but pervasive welfare failure in industrial production.
Ammonia is an invisible welfare burden affecting essentially every chicken in industrial production at some level. Unlike visible injuries, ammonia damage accumulates silently - impairing vision, damaging airways, causing discomfort with every breath. The economic incentive to reduce ventilation in cold weather to save heating costs directly conflicts with welfare. Certification programs that require monitoring and maximum ammonia levels provide a meaningful welfare floor. Consumer purchasing decisions that support such certifications create the market incentive to invest in adequate ventilation.