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Digestible threonine requirement for Japanese Quails

Grant number: 18/18376-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): October 01, 2018
Effective date (End): May 31, 2019
Field of knowledge:Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
Principal Investigator:Nilva Kazue Sakomura
Grantee:Isabella Cardeal Campos
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


The objective of this trial will be to estimate the requirement of threonine for Japanese quails. A total of 392 birds, 14 weeks old, distributed in a completely randomized design with 8 treatments (threonine levels), seven replicates and seven birds per experimental unit were used. Experimental diets will be formulated according to the dilution technique, where a diet with a high crude protein content and a protein-free diet will be formulated, then dilutions of the diets will be made to obtain increasing levels of digestible threonine (0.156; 0.312, 0.390, 0.546, 0.624, 0.702 and 0.780%). The control treatment will be added to confirm if the experimental responses will be due to the threonine limitation. This level will be obtained by adding 98% L-Threonine to the most deficient level (0.156 + 30g of 98% L-Threonine). The supply of feed will be at will and the leftovers will be quantified weekly. In the test, the production of eggs (%), weight of eggs (g), egg mass (g), ingestion of threonine (mg/bird/day) and body weight of birds will be evaluated. The Reading model will be used to estimate the requirement for threonine.