Leucine and valine supplementation of low-protein diets for broiler chickens from 21 to 42 days of age

• DOI: 10.3382/ps/pew319
• Publication Date: 2016-09-24T00:46:04Z
• Authors: I.C. Ospina-Rojas; A.E. Murakami; C.R.A. Duarte; G.R. Nascimento; E.R.M. Garcia; M.I. Sakamoto; R.V. Nunes
• Keywords: Abdominal fat; Completely randomized design

The objective of this study was to determine the requirements and interactions between standardized ileal digestible (SID) Leu Val levels in low-protein diets, their effects on performance, serum characteristics, carcass yield diameter muscle fibers broiler chickens from d 21 42 posthatch. A total 1,500 21-day-old Cobb 500 male were distributed a completely randomized design 5 × factorial arrangement for 25 treatments with 3 replicates 20 birds each. Treatments consisted SID (1.0, 1.2, 1.4, 1.6, or 1.8%) (0.52, 0.67, 0.82, 0.97, 1.12%). At age, there interaction (P < 0.05) feed intake weight gain. There quadratic effect conversion, minimal point estimated at 1.19 0.86%, respectively. Dietary supplementation reduced linearly concentrations triglycerides β-hydroxybutyrate. increased ≤ fiber diameters pectoralis major breast 1.24 1.13%, respectively, while thigh improved level 0.71% Val. Abdominal fat decreased increasing dietary needed optimize gain conversion low-CP diets posthatch 1.15 can reduce abdominal deposition fed during grower phase. influence performance but not broilers diets. Therefore, it is necessary consider content estimate ideal optimum performance.