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Problems related to the Physiology of Hens
The Principle of Brooding and Practical
Creation of an Environment for the Growing Period
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140 days old accommodated adult layers ammonia amount of feed April chicks become body weight breeds broiler brooder brooding room carbon dioxide changes chicks hatched cold cold wave culled daytime debeaking effect egg laying egg prices egg production egg weight environment environmental control favorable feed amount feed intake feet flock composition forced molting growing batteries growing cage house growing cage period growing chicks growing period growing room growing viability growth hatched in April hen per day henhouse humidity important increase indoor temperature Japan laying cages laying house laying performance laying period laying rate laying viability Maruto's molting months number of birds optimum ounces outdoor temperature oxygen peak production physiological poultry farm poultry management poultrymen pullets reached rearing restricted feeding system room temperature season sexual maturity shown in Table sliding combination windows summer thermoregulation tion Toyohashi ventilation requirements weeks old wind winter