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Tipo do documento: Artigo
Título: Determination of digestible isoleucine:lysine ratio in diets for laying hens aged 42-58 weeks
Autor: Mello, Heloisa Helena de Carvalho
Gomes, Paulo Cezar
Rocha, Tatiana Cristina da
Donzele, Juarez Lopes
Almeida, Rodrigo Lopes de
Troni, Allan Reis
Carvalho, Bruno Reis de
Viana, Gabriel da Silva
Abstract: Two hundred and fifty-two Hy-Line W36 laying hens were allotted in a completely randomized design with 6 treatments, 7 replicates and 6 hens per experimental unit in order to determine the ideal ratio of isoleucine (Ile) in relation to lysine (Lys) to laying hens aged 42-58 weeks. Experimental diets contained digestible Ile at different levels, resulting in different Ile:Lys ratios (0.73:1; 0.78:1; 0.83:1; 0.88:1; 0.93:1 and 0.98:1). A basal diet was formulated to provide Isoleucine in levels below recommendations. This diet was supplemented with L-isoleucine to make up the 6 diets. Each diet was made isonitrogenous by varying the dietary contents of glutamic acid and isocaloric by adjusting the contents of cornstarch. All essential amino acids were provided proportionally to lysine. Egg production, egg weight, egg mass, feed conversion ratio, albumen, yolk and eggshell contents were recorded and compiled at every 28-day period. No differences were observed in the performance over a wide range of dietary isoleucine concentrations from 5.76 to 7.73 g/kg corresponding to 0.73:1 to 0.98:1 Ile:Lys ratios. The lowest Ile:Lys ratio (0.73:1) was sufficient to ensure satisfactory performance of birds, corresponding to the consumption of 534 mg of isoleucine and 731 mg of lysine/day.
Palavras-chave: Digestible amino acids
Egg quality
Ideal protein
White laying hens
País: Brasil
Unidade acadêmica: Escola de Medicina Veterinária e Zootecnia - EVZ (RG)
Citação: MELLO, Heloisa Helena de Carvalho et al. Determination of digestible isoleucine: lysine ratio in diets for laying hens aged 42-58 weeks. Revista Brasileira de Zootecnia, Viçosa, v. 41, n. 5, p. 1313-1317, 2012.
Tipo de acesso: Acesso Aberto
Identificador do documento: 10.1590/S1516-35982012000500032
Identificador do documento: 10.1590/S1516-35982012000500032
Data de publicação: 2012
Aparece nas coleções:EVZ - Artigos publicados em periódicos

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