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Models for estimating the digestible threonine requirement for laying hens

Grant number: 11/04859-0
Support type:Scholarships in Brazil - Master
Effective date (Start): March 01, 2012
Effective date (End): December 31, 2012
Field of knowledge:Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
Principal researcher:Nilva Kazue Sakomura
Grantee:Joyce Sato
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
Associated research grant:08/50557-3 - Models to estimate amino acids requirements for broilers, laying type pullets and laying hens, AP.TEM


The objective of this project will study the requirements of threonine based on the method and dose-response factor, to develop models to predict the requirements of this amino acid in the production phase. There will be a test dose-response. Utilizing 288 pullets strain Dekalb White with 30 weeks of age. The birds will be distributed in a completely randomized design with eight treatments (levels of threonine) and six replications, each experimental unit consisted of eight birds. The treatments consisted of seven increasing levels of threonine (0.115, 0.230, 0.346, 0.461, 0.576, 0.673 and 0.748%) plus a level control, to confirm that the experimental responses are due to the limitations of the test amino acid, obtained by supplementation of 1.15% more at the level 0.115%. For the formulation of diets will be adopted dilution technique. Will be formulated a diet high in PB containing 0.748% of threonine. This diet is diluted sequentially with other isoenergetic, protein-free, enabling the achievement of increasing levels of threonine. The rations will be provided at will. The experiment will run for 16 weeks. Will be determined egg production (%), feed intake (g), threonine intake (g / bird / day), weighing the birds, feed conversion (g / g), average egg weight (g), and mass eggs every 28 days. The data of threonine intake, egg mass and body weight will be adjusted by the method of Reading EFG using the software to determine the parameters of the model. Based on the factorial method will produce a model to estimate the requirements for threonine. (AU)

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SATO, Joyce. Modelos para estimar exigências de treonina digestível para poedeiras comerciais. 2012. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal Jaboticabal.

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