| Texto completo | |
| Autor(es): |
Reis, Matheus De Paula
[1]
;
Sakomura, Nilva Kazue
[1]
;
Teixeira, Izabelle A. M. A.
[1]
;
da Silva, Edney Pereira
[1]
;
Kebreab, Ermias
[2]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Paulista UNESP, Fac Ciencias Agr & Vet, Jaboticabal, SP - Brazil
[2] Univ Calif Davis, Dept Anim Sci, Davis, CA 95616 - USA
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PLoS One; v. 13, n. 12 DEC 12 2018. |
| Citações Web of Science: | 2 |
| Resumo | |
Determining the efficiency of amino acid (AA) utilization in growing animals is crucial to estimate their requirement accurately. In broiler chickens, the composition of AA in feather is different from feather-free body and the proportion of feathers will change along broiler's growth, which may impact the efficiency of utilization on AA consumed. Therefore, in order to establish a method that predicts the efficiency of utilization for feather-free body and feather, two approaches were evaluated: a multiple linear regression and a multivariate analysis. Additionally, a new factorial model was proposed to predict AA requirements in broiler chickens. Data from 13 trials that evaluated the requirements for lysine (Lys), sulphur AA (SAA), threonine (Thr), and valine (Val) in male broilers were used for the analyses. Both methods of analysis were consistent in showing that the efficiency of utilization in feather free body and feather were different. Using multiple linear regression, the values of efficiency of utilization estimated in feather-free body were 0.68, 0.72, 0.81, 0.79 (mg of amino acid deposited / mg of amino acid consumed above maintenance) and in feather were 0.58, 0.77, 0.78, and 1.57 (mg/mg) for Lys, SAA, Thr, and Val, respectively. Applying the multivariate approach, the corresponding predicted values were 0.68, 0.67, 4.23, 0.27 (mg/mg) in feather-free body and 1.16, 0.86, 0.16, and 1.10 (mg/mg) in feather, respectively. According to the results, efficiency of utilization may be related, to some extent, on the concentration determined in each tissue. The uncertainty around the amount of AA consumed for gain directed to feather-free body or feather deposition could be a limitation for multivariate analyses. The results indicated that multiple linear regression predictions may be better estimates of utilization efficiency. However, more studies are needed to elucidate the effect of age on deposition and partitioning of dietary AA in different parts of the broiler. (AU) | |
| Processo FAPESP: | 16/11172-5 - Modelo computacional para simulação do crescimento e otimização dos níveis nutricionais para frangos de corte |
| Beneficiário: | Matheus de Paula Reis |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 15/50444-8 - Improving our understanding of nutritional requirements to reduce environmental impact of livestock |
| Beneficiário: | Izabelle Auxiliadora Molina de Almeida Teixeira |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 13/25761-4 - Modelagem da produção e das exigências nutricionais de aves e peixes |
| Beneficiário: | Nilva Kazue Sakomura |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |