Bien-être du poulet de chair : détermination des conditions d'ambiance et des caractéristiques physico-chimiques de la litière responsables de l'apparition de dermatites de contact en Poulet de chair

Abstract : Two studies were carried out. 3888 broilers chickens were reared until 35 or 42 days old. 600 animals were observed regularly for dermatitis during rearing period. At slaughter, lesions of 1200 broilers were scored. Two environments (temperature and ventilation) and two diets were tested to obtain different characteristics of litter. The correlations between these measured characteristics and the severity of dermatitis were realised. Foot pad dermatitis appeared very early in the life of chickens. On the 9th day old chicks, elongated brown scales, and sometimes ulcers, were already visible at the footpads. Hock burn and breast lesions appeared later, from 23 and 35 days, respectively. Litter was sampled at the same time as the observation of lesions. Our study underlined the huge effect of litter pH, moisture, nitrogen and temperature on the development of dermatitis. Thus, dermatitis scores were the highest when litter was acid, humid, rich in nitrogen and cold. However, in the present study, foot pad dermatitis observed at 9 days were not correlated with litter parameters studied. Some other substances could have been enclosed in the litter from the start. These substances could be responsible for the development of lesions. Moreover fast growing chickens could develop more contact dermatitis.
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Master thesis
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Pauline Olivere. Bien-être du poulet de chair : détermination des conditions d'ambiance et des caractéristiques physico-chimiques de la litière responsables de l'apparition de dermatites de contact en Poulet de chair. Sciences de l'environnement. 2010. ⟨hal-01883145⟩

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