Emissions gazeuses en élevage porcin et mode de réduction : revue bibliographique

Gaseous emissions in pig husbandry and measures of reduction : a review. Atmospheric emissions of pig husbandry are studied at the level of the farm building, storage area and land used for spreading. The process leading to formation of NH3,N2O, CH4 and various smelling gases, the parameters controlling their level of emission, and their effects are described. Emission of molecular nitrogen is also addressed. Measures for reducing atmospheric emissions are detailed. They rely on animal feeding, design of farm building and storage area, air treatments, effluent management and disposal. The sub-products of the effluents are also considered. The costs of the techniques used to reduce gas emissions are detailed in BEF per weight of carcass. This document gives evidence that the most effective measures to reduce the emissions are linked to the design of the farm buildings and the storage of the effluents.