Data/hora: 21/06/2024 12:23:17

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