Data/hora: 10/06/2024 03:43:03

Provedor de dados: 	96	
País: 	Brazil	
Título: 	Digestible threonine to lysine ratio in diets for laying hens aged 24-40 weeks	
Autores: 	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.	
Data: 	2013-12-01	
Ano: 	2013	
Palavras-chave: 	Amino acids; Egg production; Ideal protein; White laying hens.	
Resumo: 	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.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013001200007	
Editor: 	Sociedade Brasileira de Zootecnia	
Relação: 	10.1590/S1516-35982013001200007	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Zootecnia  v.42 n.12 2013	
Fonte: 	info:eu-repo/semantics/openAccess