Use este identificador para citar ou linkar para este item: http://repositorio.bc.ufg.br/handle/ri/18908
Tipo do documento: Artigo
Título: Digestible tryptophan: digestible lysine ratio in diets for laying hens from 24 to 40 weeks of age
Autor: Calderano, Arele Arlindo
Gomes, Paulo Cezar
Donzele, Juarez Lopes
Barreto, Sergio Luiz de Toledo
Vellasco, Cássia Rampini
Mello, Heloisa Helena de Carvalho
Lelis, Guilherme Rodrigues
Rocha, Tatiana Cristina da
Abstract: The objective of this study was to determine the ideal digestible tryptophan:digestible lysine ratio in diets for laying hens from 24 to 40 weeks of age. Two hundred and forty Hy-Line W-36 laying hens at 24 weeks of age were distributed in a completely randomized design, with five treatments, eight replicates and six birds per experimental unit. The digestible tryptophan levels in the experimental diets were 1.57; 1.68; 1.79; 1.90 and 2.01 g/kg, providing ratios of digestible tryptophan:digestible lysine of 0.215; 0.230; 0.245; 0.260 and 0.275. The increase in the levels of digestible tryptophan in the diet linearly improved the feed intake, digestible tryptophan intake, digestible lysine intake, egg production, egg mass, feed conversion per egg mass and utilization efficiency of digestible lysine for eggs mass. There were quadratic effects from the digestible tryptophan levels on egg weight. For the efficiency of utilization of digestible lysine for egg mass, there was better adjustment of the data to the LRP model. The level of digestible tryptophan in the diet from which the plateau occurred was 0.184%. This level corresponded to the intake of 142 mg/bird/day of digestible tryptophan and digestible tryptophan:digestible lysine ratio of 0.252. The ideal digestible tryptophan:digestible lysine ratio recommended in diets for laying hens from 24 to 40 weeks of age is 0.252 (25.2%).
Palavras-chave: Amino acid
Birds
Ideal protein
País: Brasil
Unidade acadêmica: Escola de Medicina Veterinária e Zootecnia - EVZ (RG)
Citação: CALDERANO, Arele Arlindo et al. Digestible tryptophan: digestible lysine ratio in diets for laying hens from 24 to 40 weeks of age. Revista Brasileira de Zootecnia, Viçosa, v. 41, n. 10, p. 2176-2182, 2012.
Tipo de acesso: Acesso Aberto
Identificador do documento: 10.1590/S1516-35982012001000006
Identificador do documento: 10.1590/S1516-35982012001000006
URI: http://repositorio.bc.ufg.br/handle/ri/18908
Data de publicação: 2012
Aparece nas coleções:EVZ - Artigos publicados em periódicos

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