Use este identificador para citar ou linkar para este item: http://repositorio.bc.ufg.br/handle/ri/18883
Tipo do documento: Artigo
Título: Digestible threonine to lysine ratio in diets for laying hens aged 24-40 weeks
Autor: Rocha, Tatiana Cristina da
Gomes, Paulo Cezar
Donzele, Juarez Lopes
Rostagno, Horacio Santiago
Mello, Heloisa Helena de Carvalho
Ribeiro, Cleverson Luís Nascimento
Troni, Allan Reis
Abstract: Two-hundred sixteen white laying hens were used to assess the ideal ratio of digestible threonine:lysine in diets for laying hens at 24 to 40 weeks of age. Birds were assigned to a randomized block design, with six treatments, six replicates per treatment and six birds per experimental unit. The cage was used as the blocking criterion. Experimental diets contained different digestible threonine:digestible lysine ratios (65, 70, 75, 80, 85 and 90%) with 142 g/kg of crude protein. Experimental diets were formulated to be isonitrogenous and isocaloric with different contents of L-glutamic acid. Feed intake (g/hen/d), egg production (%), egg weight (g), egg mass (g/hen/d), feed conversion ratio (kg/dozen and kg/kg egg), eggshell weight (g), albumen weight (g), yolk weight (g) and body weight gain (g) were assessed. The maximum egg production was observed at 78% digestible threonine:digestible lysine ratio, while the best values of feed conversion ratio (kg/dozen egg) and feed conversion ratio (kg/kg of egg) were observed at 77.6% and 75%, respectively. Feed intake, egg mass and egg contents (yolk, albumen and eggshell) were not affected by treatments. The estimated digestible threonine:digestible lysine ratio of Hy-Line W36 laying hens at 24 to 40 weeks of age is 78%, corresponding to 5.70 g/kg of dietary digestible threonine.
Palavras-chave: Amino acids
Egg production
Ideal protein
White laying hens
País: Brasil
Unidade acadêmica: Escola de Medicina Veterinária e Zootecnia - EVZ (RG)
Citação: ROCHA, Tatiana Cristina da et al. Digestible threonine to lysine ratio in diets for laying hens aged 24-40 weeks. Revista Brasileira de Zootecnia, Viçosa, v. 42, n. 12, p. 879-884, 2013.
Tipo de acesso: Acesso Aberto
Identificador do documento: 10.1590/S1516-35982013001200007
Identificador do documento: 10.1590/S1516-35982013001200007
URI: http://repositorio.bc.ufg.br/handle/ri/18883
Data de publicação: 2013
Aparece nas coleções:EVZ - Artigos publicados em periódicos

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