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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/129224
Título: 
The optimal lysine and threonine intake for Cobb broiler breeder hens using Reading model
Autor(es): 
Instituição: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade Federal da Paraíba (UFPB)
ISSN: 
1871-1413
Resumo: 
This study aimed to determine the optimal intake of lysine and threonine for broiler breeder hens. Two experiments were conducted to evaluate the responses of birds to digestible lysine (Lys) and threonine (Thr). Eight treatments were assessed in both experiments, with six replicates of eight birds in the Lys experiment and ten birds in the Thr experiment. The dietary levels of Lys and Thr were obtained by a dilution technique. The experimental period was ten weeks for each amino acid studied, which included six weeks of adaptation and four weeks of data collection. The amino acid intake, egg mass and body weight were adjusted using a Reading model. Based on the model coefficients, the cost of the synthetic amino acids sources and the price of fertile eggs determined the intake of each amino acid to maximize. The minimum intake of Lys and Thr reduced egg production by 40 and 30%, respectively, the weight of the eggs decreased by 12 and 9% with the same intake of Lys and Thr, respectively. The models generated by predicting Lys and Thr intake were as follows: Lys=11 x E+31 x W and Thr=9.5 x E+32 x W, where E=egg mass, g/bird per day, and W=body weight, kg/bird. Based on the models, 3 kg birds with an egg mass production of 50 g/day require 643 mg/bird per day of Lys and 569 mg/bird per day of Thr. The optimum economic intake was calculated at 954 and 834 mg/bird per day for Lys and Thr, respectively, reflecting a dietary concentration of 0.636% Lys and 0.556% Thr for a feed intake of 150 g/bird per day. (C) 2015 Elsevier B.V. All rights reserved.
Data de publicação: 
1-Abr-2015
Citação: 
Livestock Science, v. 174, p. 59-65, 2015.
Duração: 
59-65
Publicador: 
Elsevier B.V.
Palavras-chaves: 
  • Amino acid
  • Body weight
  • Egg mass
  • Population
  • Reading model
Fonte: 
http://www.sciencedirect.com/science/article/pii/S1871141315000487
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/129224
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