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Modeling energy utilization and growth parameter description for broiler chickens.
N K Sakomura1, F A Longo, E O Oviedo-Rondon
1Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil. sakomura@fcav.unesp.br
Poultry Science
|October 7, 2005
Summary
This study developed a new model to accurately estimate broiler energy requirements, considering environmental temperature and body composition. The model provides more precise daily metabolizable energy (ME) intake predictions than existing methods.
Area of Science:
- Animal Nutrition
- Poultry Science
- Energy Metabolism
Background:
- Accurate estimation of broiler metabolizable energy (ME) requirements is crucial for optimizing growth and feed efficiency.
- Existing models may not fully account for environmental factors and body composition changes.
- Understanding energy utilization for maintenance and deposition is key to broiler nutrition.
Purpose of the Study:
- To develop and validate a model for estimating daily ME requirements in broilers.
- To determine maintenance energy requirements and energy utilization efficiencies for fat and protein deposition.
- To evaluate the model's accuracy against observed ME intake and compare it with other established models.
Main Methods:
- Two experiments were conducted: one to determine maintenance ME and deposition efficiencies, and a second to gather growth data for model validation.
- Maintenance ME requirements were calculated at different temperatures, and a quadratic relationship with temperature was established.
- Energy requirements for fat (Gf) and protein (Gp) deposition were quantified, leading to a comprehensive ME requirement model.
Main Results:
- Maintenance ME requirements varied quadratically with environmental temperature (MEm = 307.87 - 15.63T + 0.3105T(2)).
- Energy requirements for fat and protein deposition were determined as 13.52 and 12.59 kcal ME/g, respectively.
- The developed model, incorporating body weight, temperature, and fractional fat/protein deposition, showed closer agreement with observed ME intake than previous models.
Conclusions:
- The proposed model accurately estimates daily ME requirements for broilers under varying conditions.
- Environmental temperature significantly influences maintenance energy needs.
- The model's ability to integrate multiple factors enhances its utility for precision broiler nutrition.