RESUMOEstudou-se a exigência de proteína bruta e energia metabolizável para codornas européias em crescimento, em cinco períodos experimentais, de sete dias cada. Foram utilizadas 384 codornas de ambos os sexos, com sete dias de idade em delineamento experimental utilizado inteiramente ao acaso, em esquema fatorial de 2×4, dois níveis de energia (2900 e 3100kcal de EM/kg de ração) e quatro níveis de proteína (22, 24, 26 e 28% de PB), com seis repetições de oito animais cada. Foram estudadas as variáveis ganho de peso (g), peso acumulado (g), consumo de ração (g) e conversão alimentar (g de ração/g de peso). Observou-se efeito linear dos níveis de proteína no primeiro período e quadrático nos demais períodos sobre o ganho de peso das aves. Os níveis de proteína foram estimados em 28,0% (2900kcal de EM/kg), 25,7% (3100kcal de EM/kg), 27,9%, 24,8% (3100kcal de EM/kg) e 23,1% (2900kcal de EM/kg) para o segundo, terceiro, quarto e quinto período, respectivamente.Palavras-chave: codorna de corte, energia metabolizável, proteína bruta ABSTRACT Crude protein (CP) and metabolizable energy (ME) levels during five experimental periods of seven days each of the growing phase for European quail were determined. A total of 384 quails of both sexes were used in a completely randomized design in a 2×4
RESUMOEstudou-se a exigência de metionina + cistina total para codornas de corte em crescimento durante os períodos inicial (sete a 21 dias) e final (22 a 42 dias de idade). O delineamento experimental foi inteiramente casualizado, com cinco repetições de 13 codornas por unidade experimental. Os tratamentos consistiram de seis níveis de metionina + cistina total (0,73; 0,79; 0,85; 0,91; 0,97 e 1,03%). Foram estudadas as variáveis: ganho de peso (g), peso final no período (g), consumo de dieta (g) e conversão alimentar (g de dieta/g de peso). As respostas de desempenho foram obtidas por meio de modelos de regressão linear e quadrática. Codornas de corte alimentadas com dietas contendo 0,95% de metionina + cistina total no período inicial (sete a 21 dias) e 0,73% de metionina + cistina total no período final (22 a 42 dias) de criação obtêm máximo ganho de peso.Palavras-chave: codorna, exigência nutricional, aminoácido, ganho de peso, consumo alimentar, conversão alimentar ABSTRACT Total methyonine + cystine requirements during the initial (7-21 days of age) and final period ( 22-
Thermal homeostasis, nutrition, environmental temperature, cloacal temperature. ABSTRACTThe objective of the present study was to evaluate the effects of different dietary crude protein (CP) and metabolizable energy (ME) levels on the performance, internal and external egg quality, and cloacal temperature of commercial layers reared in hot climate. In this trial, 100 commercial Hy-Line W-36 layers between 20 and 32 weeks of age were distributed according to a completely randomized experimental design with a 2 x 2 factorial arrangement, consisting of two CP levels (15 e 18%) and two ME contents (2700 and 3100 kcal/kg) with five replicates per treatment and 10 birds per replicate. Performance (feed intake, egg production, egg mass, and feed conversion ratio), internal (Haugh units and albumen and yolk percentage) and external (eggshell % and thickness) egg quality parameters were evaluated. Cloacal temperature was measured in two birds per replicate at 8:00 h and 13:00 h. The diet containing 2700 kcal ME/kg promoted the best performance, whereas the worse performance observed in birds fed the diet with 3100 ME/ kg was partially recovered when the diet contained 18% CP. Haugh units worsened as dietary CP level increased. The other external and internal egg quality parameters were not affected by dietary CP or ME levels. The cloacal temperature of birds fed 15% CP was lower in the morning and higher in the afternoon relative to those fed 18% CP, which temperature did not change during the day. It was concluded that dietary CP and ME levels influenced the performance and the body temperature of commercial layers.
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