Data/hora: 24/09/2024 04:22:04

Biblioteca(s): 	Embrapa Suínos e Aves.	
Data corrente: 	05/12/2018	
Data da última atualização: 	14/01/2019	
Autoria: 	LELIS, G. R.; TAVERNARI, F. de C.; CALDERANO, A. A.; DALLA COSTA, F. A.; ALBINO, L. F. T.; ROSTAGNO, H. S.; BRITO, C. O.; ARAÚJO, V. A. G. de; RIBEIRO JÚNIOR, V.	
Afiliação: 	GUILHERME RODRIGUES LELIS, Vale Fertilizantes S/A.; FERNANDO DE CASTRO TAVERNARI, CNPSA; ARELE ARLINDO CALDERANO, UFV; FILIPE ANTONIO DALLA COSTA, UNESP/Jaboticabal; LUIZ FERNANDO TEIXEIRA ALBINO, UFV; HORÁCIO SANTIAGO ROSTAGNO, UFV; CLAUDSON O. BRITO, UFS; VAGNER A. G. de ARAÚJO, IFNMG/Januária; VALDIR RIBEIRO JÚNIOR, UFS.	
Título: 	Digestible threonine-to-lysine ratio in diets for brown egg-laying hens.	
Ano de publicação: 	2018	
Fonte/Imprenta: 	Journal of Applied Poultry Research, pfy 057, 2018.	
DOI: 	10.3382/japr/pfy057.	
Idioma: 	Inglês	
Conteúdo: 	Abstract: he objective of this study was to evaluate the levels of digestible threonine to determine the ideal digestible threonine-to-lysine ratio in the diet of brown egg-laying hens aged 42?54 wk. A total of 270 Dekalb Brown hens were used in a Completely randomized design (5 treatments × 9 replicates × 6 birds = 270 birds). Five different ratios of digestible threonine-to-lysine were evaluated: 66% (0.435% Thr dig), 70%, 74%, 78%, and 82%. The diets were formulated to satisfy the animals? nutritional requirements and amino acid relationships (2,950 Kcal/Kg ME and 14.81% CP), with the exception of threonine and lysine. The ratio of digestible threonineto-lysine was obtained by L-Threonine (98%) supplementation in place of starch. Parameters such as feed intake (g/bird/d), egg production (%), egg weight (g), egg mass (g), feed (kg/dz and g/g), relative weight of egg components (% yolk, albumen, and eggshell), and weight gain (g) were evaluated. As a result, feed intake, egg weight, relative weight of egg components, and weight gain were found not to be influenced by the digestible threonine-to-lysine ratio used. Egg production, egg mass, and feed conversion (kg/dz and g/g) displayed a quadratic effect for the different ratios used. Based on the results, the digestible threonine-to-lysine ratio recommended in the diets of laying hens between 42 and 54 wk of age is 72%, which corresponds to 0.478% of digestible threonine or 460 mg/bird/d of digestible threonine.	
Palavras-Chave: 	Poedeira; Produção de ovos; Treonina.	
Thesagro: 	Dieta; Galinha Para Postura; Lisina; Ovo.	
Thesaurus Nal: 	Diet; Egg masses; Egg production; Laying hens; Lysine; Threonine.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Suínos e Aves (CNPSA)	
Exemplares: 	CNPSA - (21514-1) - UPC - AP - DD -  -  -  - DIS