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Year : 1999
Tome : 150
Volume : 6
Pages : 499-510
Title : Composting of pigs waste in deep litter systems
Authors : M. DIDIER
Summary : Deep litter housing is increasingly used for the fattening up of pigs. Breeder thereby reconciliate economical nature economical and environmental constraints and Given that (a) the fertilizing value of animal dejecta depends on the nature and the quantity of the substratum they are incorporated into and (b) composting is the best transformation of the waste with a view to its recycling in agriculture, deep litter is an agronomical asset. The decomposing processes within the litter are regulated by aeration(pigs rooting, mechanical maintenance by the breeder) on one band and by its biological and physicochemical properties on the other hand. Two rules are primordial to avoid dysfunctionning usually induced by an exces of humidity : (i) correct ventilation of the houses to evacuate the steam produced by the aerobic fermentations, (ii) use of «nourrisoupes>> tu eliminate the water wasting by the pigs. The advantages of the deep litter system lies in the well-being of the animals and in the comfort of the breeder, while maintaining the growth rates and food conversion. Moreover, this technique facilitates the effluent management by reducing their volume and by fixing the organic matter. Its disadvantages are heavy metal soil pollution.Considering the latter point, deep litter housing brings no improvement compared to slurry. The constraints of the technique are related to high labour costs and to the sanitary risc for the successive batches of fattening pigs,on the saine deep litter material.
Keywords : Deep-lifter housing, growth performance, welfare, pigs
Correspondence : M. DIDIER
Adress : Unité de Zootechnie, d'Ethnologie et d'Economie Rurale, École Nationale Vétérinaire de Lyon, 1 avenue Bourgelat B.P. 83, F-69280 Marcy l' Etoile

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