| Full text | |
| Author(s): |
Acacio, R. M.
[1]
;
Sakomura, N. K.
[1]
;
Viana, G. S.
[2]
;
Malheiros, E. B.
[3]
;
Fernandes, J. B. K.
[4]
;
Suzuki, R. M.
[1]
Total Authors: 6
|
| Affiliation: | [1] Sao Paulo State Univ, Fac Agr & Vet Sci, Dept Anim Sci, BR-14884900 Jaboticabal, SP - Brazil
[2] Nat Resources Inst Finland, Prod Syst, Luonnonvarakeskus Luke, Jokioinen 31600 - Finland
[3] Sao Paulo State Univ, Fac Agr & Vet Sci, Dept Exact Sci, BR-14884900 Jaboticabal, SP - Brazil
[4] Sao Paulo State Univ, Fac Agr & Vet Sci, Aquaculture Ctr, BR-14884900 Jaboticabal, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | LIVESTOCK SCIENCE; v. 240, OCT 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
Six feeding trials were conducted to determine the optimum intake of standardized ileal digestible (SID) tryptophan of male and female broiler chickens in the starter (0 to 14 d), grower (14 to 28 d), and finisher (28 to 42 d) phases. In each trial, 640 broiler chickens were randomly assigned to 1 of 8 treatments, with 4 replicates of 20 broiler chickens. Diets were formulated by mixing a high and a low protein diet in different proportions, and dietary concentrations of SID Trp ranged 0.56 to 2.94, 0.54 to 2.75, and 0.52 to 2.60 g/kg in the starter, grower, and finisher phases, respectively. Tryptophan intake was regressed against average daily gain (ADG) and feed conversion ratio (FCR) using polynomial regression and broken-line regression model and the model that better fitted data was chosen according to Bayesian information criterion. Broiler chickens responded quadratically to increasing dietary Trp concentration and ADG was maximized at 86, 264, and 441 mg SID Trp/d for male broiler chickens (R-2 = 0.96; P < 0.01) and at 76.5, 237, and 278 mg SID Trp/d for females (R-2 = 0.97; P < 0.01) in the starter, grower and finisher phases, respectively. Feed conversion ratio was optimized at 69.9, 247, and 338 mg SID Trp/d for males (R-2 = 0.91; P < 0.01) and 67.8, 223, and 280 mg SID Trp/d for females (R-2 = 0.93; P < 0.01) in the starter, grower, and finisher phases, respectively. The optimum SID Trp intake for each sex and phase was determined based on ADG. (AU) | |
| FAPESP's process: | 13/25761-4 - Modeling production and nutritional requirements of poultry and fish |
| Grantee: | Nilva Kazue Sakomura |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 16/01716-8 - Requirements and utilization efficiency of tryptophan for broilers |
| Grantee: | Raian Malta Acácio |
| Support Opportunities: | Scholarships in Brazil - Master |