Impact of the Reduction of Straw on Ammonia, GHG and Odors Emitted by Fattening Pigs Housed in aDeep-litter System

摘要

Straw systems are appreciated by consumers because it provides a better welfare for pigs and can reduce odour nuisances. Nevertheless, the development of this way of breeding pigs should be limited by the small availability of straw which is primarlyused by beef and cattle productions. Reducing straw quantity per pig is a simple way to solve this problem of straw availability. The aim of this study was to determine the impact on ammonia, GHG and odours emissions from a 33% reduction of straw used for the bedding of fattening pigs. Two successive batches were grouped in three identical rooms which only differed in the quantity of straw used for the litter but also in the frequency of bedding. For the reference room (RR), the quantity of straw was 90kg per pig for the whole fattening period. In the second and the third room (R33 and R33F), the quantity of straw per pig was 60 kg and in R33F, the litter was replenished weekly. The reduction of straw did not induce deterioration in animal performanceand in carcase characteristics. Concerning ammonia and odours, the main effect of the reduction of straw was the increase in emissions and the degradation in the dirtiness of litter, especially forR33. The increase of ammonia and odours appears to be less important for R33F than for R33. Weekly bedding should be a good way to limit the negative effect of the reduction of straw used per pig.