Data/hora: 03/06/2024 05:01:12

Provedor de dados: 	96	
País: 	Brazil	
Título: 	Digestible tryptophan:lysine ratio for laying hens	
Autores: 	Lima,Matheus Ramalho de; Costa,Fernando Guilherme Perazzo; Guerra,Ricardo Romão; Silva,José Humberto Vilar da; Rabello,Carlos Bôa-Viagem; Miglino,Maria Angelica; Nogueira,Eduardo Terra; Pinheiro,Sarah Gomes.	
Data: 	2012-10-01	
Ano: 	2012	
Palavras-chave: 	Egg production; Histological effects; Poultry industry.	
Resumo: 	The objective of this study was to evaluate the requirement of digestible tryptophan for white laying hens in the production stage fed diets of different digestible tryptophan:digestible lysine ratios, as well as animal performance and histological alterations in their reproductive and digestive systems. A total of 280 white laying hens at 29 weeks of age were distributed in a completely randomized design with five treatments and seven replications with eight birds in each. The treatments consisted of a base feed, formulated with corn, soybean meal and corn gluten meal, and supplemented with the synthetic amino acids L-lysine, DL-methionine, L-threonine, L-isoleucine, L-arginine, and L-valine, so as to meet the nutritional requirements for laying hens, except for digestible tryptophan. The basal diet was supplemented with 0.00; 0.017; 0.035; 0.052; and 0.069 g/kg of L-tryptophan in substitution for corn starch with the objective of reaching the levels of 0.151; 0.167; 0.183; 0.199; and 0.215 g/kg of digestible tryptophan in the feed. For the ratio between digestible amino acids and lysine, the recommendation of Brazilian Tables for Poultry and Swine was followed, except for the digestible tryptophan:digestible lysine ratios, which were 19, 21, 23, 25 and 27 for each treatment. The variation in the digestible tryptophan:digestible lysine ratio promoted changes in performance and in the histological characteristics, improving the results. The digestible tryptophan:digestible lysine ratio of 24.5% in the feed of white laying hens in production stage promotes better animal performance and histological results.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001000010	
Editor: 	Sociedade Brasileira de Zootecnia	
Relação: 	10.1590/S1516-35982012001000010	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Zootecnia  v.41 n.10 2012	
Fonte: 	info:eu-repo/semantics/openAccess