Techniques to reduce ammonia and greenhouse gases emissions in non-caged laying hen houses

The OG objective is to determine the degree of reduction of ammonia and greenhouse gases emissions that can be realized in some innovative types of housing systems alternative to cages for laying hens: the aviary system combined to the external drying tunnel and the system with longitudinal ventilation under the perchery. The ammonia emission levels associated with the techniques will allow to provide elements to qualify the techniques as BAT. The main expected results are:
• Quantification of ammonia emissions from the housing system for laying hens on the ground with a longitudinal ventilation, to qualify the techniques as BAT.
• Quantification of the reduction of ammonia emissions achieved with the association of the external drying tunnel to the aviary system.
• Quantification of the reduction of ammonia emissions achieved with the association to the aviary system of complementary feed with antioxidant action.
• Quantification of emissions during storage and land spreading of poultry manure with different composition.