intervalo para o alojamento e níveis de lisina, em dietas baseadas no conceito de proteína ideal, sobre o desenvolvimento muscular e rendimento de carcaça de frangos de corte delayed placement and dietary lysine levels, on diets based in the ideal protein concept, on muscular development and carcass yield of broiler chickens
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2012
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Abstract
Este trabalho objetivou estudar os efeitos do intervalo para o alojamento (IA) e de níveis de lisina digestível (LD) nas dietas iniciais sobre o desenvolvimento do músculo do peito e rendimento de carcaça de frangos de corte. Para tanto, 1.760 pintos de corte, machos, Cobb500, foram distribuídos aleatoriamente em oito grupos experimentais em arranjo fatorial 2x4 de 4 IAs (12, 24, 36 e 48h) e dois níveis de LD (1,143 e 1,267%), com quatro repetições e 55 aves por unidade experimental. Met+Cys, Thr e Trp foram balanceados no conceito de proteína ideal. Não houve interação significativa entre LD e IA sobre as variáveis avaliadas. Os maiores pesos do peito desossado e filé de peito aos 21 dias de idade e peso corporal aos 43 dias foram obtidos no nível de 1,143% de LD. O peso do peito desossado, peso do filé, diâmetro das fibras musculares aos 21 dias, peso vivo, peso da carcaça e peso das pernas aos 43 dias de idade decresceram linearmente de acordo com o aumento no intervalo para alojamento. Os resultados deste estudo sugerem que o nível de 1,143% de LD favorece aumento no músculo peitoral aos 21dias e o peso vivo dos frangos aos 43 dias, e que o menor intervalo para o alojamento melhora o desenvolvimento dos músculos peitorais durante a fase inicial, e maior rendimento da carcaça inteira e das pernas no abate.
This study aimed to study the effects of delayed placement (IA) and dietary lysine levels (LD) in initial diets on breast muscle development and carcass yield of broiler chickens. For this, 1,760 male Cobb500 chicks were allocated randomly to eight experimental groups according to a 2x4 factorial arrangement for 4 IAs (12, 24, 36 and 48h) and 2 levels of LD (1.143 and 1.267%) with four replicates and 55 chicks per experimental unit. Met+Cys, Thr and Trp were balanced according to the ideal protein concept. There were no significant interactions between LD and IA on variables evaluated. The highest breast weight and breast fillet weight at 21 days old and body weight at 43 days old were obtained with the dietary lysine level of 1.143%. The breast weight, breast fillet weight and muscle fiber diameter at 21 days old, body weight, carcass weight and legs weight at 43 days old decreased linearly according to the increase of the delayed placement. The results of this study suggest that the 1.143% DL level improves the breast muscle development at 21 days old and chicken body weight at 43 days old, and the shortest delayed placement improves the breast muscle development during the initial phase and higher carcass yield and legs at the slaughter.
This study aimed to study the effects of delayed placement (IA) and dietary lysine levels (LD) in initial diets on breast muscle development and carcass yield of broiler chickens. For this, 1,760 male Cobb500 chicks were allocated randomly to eight experimental groups according to a 2x4 factorial arrangement for 4 IAs (12, 24, 36 and 48h) and 2 levels of LD (1.143 and 1.267%) with four replicates and 55 chicks per experimental unit. Met+Cys, Thr and Trp were balanced according to the ideal protein concept. There were no significant interactions between LD and IA on variables evaluated. The highest breast weight and breast fillet weight at 21 days old and body weight at 43 days old were obtained with the dietary lysine level of 1.143%. The breast weight, breast fillet weight and muscle fiber diameter at 21 days old, body weight, carcass weight and legs weight at 43 days old decreased linearly according to the increase of the delayed placement. The results of this study suggest that the 1.143% DL level improves the breast muscle development at 21 days old and chicken body weight at 43 days old, and the shortest delayed placement improves the breast muscle development during the initial phase and higher carcass yield and legs at the slaughter.
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| Authors | ;José Rodrigo Galli Franco;Alice Eiko Murakami;Cristiane Regina do Amaral Duarte;Jovanir Inês Müller Fernandes;Elis Regina de Moraes Garcia;Ivan Moreira |
| Journal | Trials |
| Year | 2012 |
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