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- W2340152580 abstract "Heat stress is a main problem of modern broiler production under tropical conditions. Passive heat dissipation of normally feathered broilers is restricted to small areas of the body surface which are not covered by feathers, such as wattles, combs and legs, and the production of metabolic heat in contemporary fast-growing broilers often exceeds the potential of passive heat loss under hot conditions. It has been reported that litter temperature increases with increasing stocking density, due to the accumulation of droppings that increase the bacterial fermentation in the litter (REITER and BESSEI, 2001; YADGARI et al., 2006). Moreover, at high stocking density the entire floor surface is covered by birds, and the heat from the litter cannot be removed effectively by the usual ventilation systems. Thus, broilers may suffer from heat stress even under moderate climatic conditions. Reduced growth rate in response to increasing stocking density on deep litter is well documented (SCHOLTYSSEK and GSCHWINDT-ENSINGER, 1983; SHANAWANY, 1988; SCHERER, 1989; GRASHORN and KUTRITZ, 1991; WIEDMER and HADORN, 1998; YADGARI et al., 2006). When birds are kept on wire or ventilated floor, the depression of growth rate occurs at higher stocking densities as compared to conventional deep litter systems (SCHOLTYSSEK and GSCHWINDT-ENSINGER, 1983; ARKENAU et al., 1997). This underlines the crucial role of stocking density, ambient temperature and heat dissipation in modern commercial broiler production systems. Naked neck broilers perform better under high ambient temperatures as compared to normally feathered birds (HORST, 1982; MERAT, 1986, 1990; CAHANER et al., 1993; DEEB and CAHANER, 2001; CAHANER et al., 2008). This is due to areas without feathers on the neck as well as reduced feather density at the entire body area. The beneficial effect of artificially de-feathered neck areas was also demonstrated in broiler breeders (GERKEN et al., 2006). Featherless broilers, which do not have feathers at any part of the body, may be even better adapted to hot ambient temperature than naked neck chickens. CAHANER et al. (2003) and YARON et al. (2004) reported that featherless broilers, homozygous for the Scaleless mutation (sc/sc)," @default.
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- W2340152580 date "2010-01-01" @default.
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- W2340152580 title "The influence of stocking density on the behaviour of featherless and normally-feathered broilers under hot ambient temperature Der Einfluss der Besatzdichte auf das Verhalten von genetisch federlosen und normal befiederten Masthühnern unter hohen Temperaturen" @default.
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