Requirements and utilization efficiency of tryptophan for broilers

• Grant number: 16/01716-8
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): October 01, 2016
• Effective date (End): January 31, 2018
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Principal Investigator: Nilva Kazue Sakomura
• Grantee: Raian Malta Acácio
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
• Associated research grant: 13/25761-4 - Modeling production and nutritional requirements of poultry and fish, AP.TEM

Abstract

The addition of tryptophan (TRP) in diets for broilers can meet the requirement, reducing the crude protein content of the feed, in addition to maintaining the homeostasis and the consumption control, these factors are relevant to increase the productivity. Therefore, this study aims to estimate the requirements and tryptophan utilization efficiency for broilers. Will be three dose responses in test phases (starting at 14 -1 growing - 15 to 28 and finishing - 29 to 42 days of age). In each test, the experimental design will be completely randomized, consisting of 16 treatments in a factorial 2 x 8 (eight amino acid levels and sexes) with four replicates of 20 birds each. The experimental diets will be formulated through the "Dilution Technique". The variables are: performance (weight gain, feed intake, feed conversion), yelled of cuts (carcass, breast, thigh and drumstick), body protein deposition (DPB) in feather (DPF) and efficiencies of using tryptophan (k). The data will be subjected to regression analysis to fit the LRP models, quadratic polynomial, quadratic and exponential + LRP will also be elaborated factorial model: TRP = [(AATRP.PBm0,73.u) + (0,01.WPF. AAF)] + [(AAB.DPB/k) + (AAF.DPF/k), where AATRP is the requirement for maintenance of TRP protein defeathering body (mg/PBm0,73 u/day.); PBm is the weight of body protein at maturity (kg); u is the degree of maturity of body protein (u = PBt / PBm); WPF is the protein weight of the feathers (g); AAF and AAB is the tryptophan content in protein pen and fleeced body (g/mg) respectively. Statistical analyzes will be conducted with SAS 9.2. The expected results will establish optimal levels of tryptophan and its utilization efficiency for body protein deposition and develop models to estimate tryptophan requirements in broilers of lineage Cobb. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ACACIO, R. M.; SAKOMURA, N. K.; VIANA, G. S.; MALHEIROS, E. B.; FERNANDES, J. B. K.; SUZUKI, R. M.. Optimum standardized ileal digestible tryptophan intake for broiler chickens. LIVESTOCK SCIENCE, v. 240, OCT 2020. (13/25761-4, 16/01716-8)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

ACÁCIO, Raian Malta. Requirements and utilization efficiency of tryptophan for broilers. 2018. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal Jaboticabal.