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Use of isoleucine , valine and tryptophan for maintenance and egg production in order to optimize the dietary levels for commercial laying hens

Grant number: 16/14754-5
Support type:Scholarships in Brazil - Master
Effective date (Start): January 01, 2017
Effective date (End): February 28, 2018
Field of knowledge:Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal researcher:Euclides Braga Malheiros
Grantee:Vinícius Duarte de Oliveira
Home 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


Nutrition is seen as a major factor in the impact of poultry production, since it management when done properly, can result in lower operating costs, and also, the possibility to increase the productivity of birds. Among the nutrients, amino acid is one of the most important, since it can cause a big impact over the production system. However, studies to establish the optimal levels of tryptophan, valine, and isoleucine are scarce for laying hens and correct estimate of amino acid intake maximize production which can lead to a reduction in costs, with consequent increase in profitability. In this context, it is proposed to study the response factors for egg mass and body weight of laying hens subjected to the intake of the amino acids isoleucine, valine, and tryptophan, targeting the economic optimum level considering different scenarios of production and market conditions. There will be a trial for each amino acid studied in metabolism shed provided with negative pressure system to control the temperature in the thermoneutral zone. In each test will be used a completely randomized design with 8 treatments and 8 repetitions (1 bird per cage), totaling 64 laying hens at 25 weeks of age. The treatments will consist of 7 increasing levels of tested amino acid (tryptophan, isoleucine, or valine) and a level rebuttal to confirm that the responses are due to the first limiting amino acid at the protein profile. Each test will last for 10 weeks, at the first 6 weeks will be adaptation and the last 4 weeks of data collection. The data will be analyzed by two approaches, deterministic and stochastic. The performance variables will be submitted to regression analysis using two mathematical models: linear and quadratic polynomial plateau SAS 9.2 (2010) software - significance level of 5%). The data from amino acid Intake, egg mass production and body weight, will be adjusted by the model of Reading, for parameters estimation and economic analysis. (AU)

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
OLIVEIRA, Vinícius Duarte de. Optimization of dietary levels of isoleucine, valine and tryptophan for the maintence and production of eggs for commercial laying hens.. 2018. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal Jaboticabal.

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