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Tipo: | Artigo |
Título: | Digestible threonine to lysine ratio in diets for laying hens aged 24-40 weeks |
Autor(es): | 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 |
Editor: | Revista Brasileira de Zootecnia |
Tipo de Acesso: | Open Access |
URI: | http://dx.doi.org/10.1590/S1516-35982013001200007 http://www.locus.ufv.br/handle/123456789/14580 |
Data do documento: | 9-Jul-2013 |
Aparece nas coleções: | Artigos |
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