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Net energy system for poultry

Grant number: 19/26575-6
Support type:Research Projects - Thematic Grants
Duration: July 01, 2020 - June 30, 2025
Field of knowledge:Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
Principal researcher:Nilva Kazue Sakomura
Grantee:Nilva Kazue Sakomura
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
Pesquisadores principais:
Marcos Macari
Assoc. researchers:Alessandro de Mello Varani ; Alex Sandro Campos Maia ; Etienne Labussière ; Jacob van Milgen ; Jean Noblet ; Kênia Cardoso Bícego ; Marie-Pierre Létourneau-Montminy ; Mingan Choct ; Robert Mervyn Gous ; Robert Swick ; Sandro Cerrate ; Shu-Biao Wu
Associated grant(s):20/14441-2 - Multi-user equipment approved in grant 2019/26575-6: respirometry system with flow kit pump, AP.EMU
Associated scholarship(s):22/11111-7 - Effect of feathering on fasting heat production, BP.IC
22/07690-1 - Evaluation of poultry net energy system under heat stress condition on broiler and molecular tools utilization for the metabolic response, BP.PD
21/04425-2 - Study of the dynamics of energy use broiler breeders over time of layer and effect of different levels of energy intake, BP.MS
+ associated scholarships 21/10555-6 - Determinação do fasting heat production em frangas de postura, BP.IC
21/08142-5 - Health challenge effect on the heat production partitioning and energy utilization in broiler chicks, BP.DD
21/07299-8 - Net energy system for poultry, BP.TT - associated scholarships


This project aims to establish net energy (NE) system for poultry. It will be determined the requirements and NE values for feedstuffs. The indirect calorimetry method will be used to measure the energy metabolism (FHP, HP and RQ), this method has already calibrated in previous studies in our laboratory. Based on factorial approach, NE requirements will be partitioned into the maintenance (NEm) and retained energy (RE). NEm will be measured by Fasting heat production (FHP). Effects of temperature, lighting program, feathering, and health status on FHP will be measured in broiler chicks. RE will be considered from deposition of protein (ERp) and fat (ERf) in the body or eggs and their caloric coefficients. Factorial models to estimated NE requirements will be elaborated based results of previous studies. To evaluated NE of feedstuff, a series of assays will be conducted with broilers and laying hens to determine NE of diets formulated with 16 ingredients used in poultry diets. Multiple linear regressions will be determined to estimate NE values from dietary nutrient content of diets for broilers and laying hens. In addition, two studies will be carried out to assess the effect of enzyme supplementation and pelletizing diets on energy partitioning. To compare the ME and NE systems, performance trials will with broilers and laying hens will be carried out in order to evaluate both prediction of performance and reduction of heat stress in NE system. Reduction of heat stress will be evaluated by heat shock proteins in broilers using PCRq. The models to estimated NE requirements for poultry and the equations to predict NE of feedstuffs will be implemented in a software to formulate diets based on NE system for poultry. (AU)

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