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Modeling metabolizable energy utilization in broiler breeder pullets.

N K Sakomura1, R Silva, H P Couto

  • 1Faculdade de Ciências Agrárias e Veterinárias, Campus de Jaboticabal, Universidade Estadual Paulista, São Paulo, Brazil. sakomura@fcav.unesp.br

Poultry Science
|April 23, 2003
PubMed
Summary

New models predict the metabolizable energy (ME) needs for broiler breeder pullets. These models account for temperature and weight gain, offering a more accurate way to feed young birds.

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Area of Science:

  • Animal Science
  • Poultry Nutrition
  • Energy Metabolism

Background:

  • Accurate estimation of nutrient requirements is crucial for optimal growth and health in broiler breeder pullets.
  • The factorial method is a common approach for determining energy requirements, but requires precise inputs for maintenance and growth.
  • Environmental temperature significantly influences the energy demands of poultry.

Purpose of the Study:

  • To develop and validate models for predicting the metabolizable energy (ME) requirements of broiler breeder pullets.
  • To assess the impact of environmental temperature on maintenance ME requirements.
  • To evaluate the accuracy of the developed models against breeder recommendations.

Main Methods:

  • Utilized the factorial method to determine ME requirements.

Related Experiment Videos

  • Employed the comparative slaughter technique in controlled environmental rooms (15, 22, 30°C) to assess maintenance ME requirements.
  • Calculated energy requirements for weight gain based on body energy content and utilization efficiency.
  • Developed two ME requirement models for different age groups (3-8, 9-14, 15-20 weeks).
  • Validated the models through a feeding trial comparing predicted energy intake with breeder recommendations.

    • Main Results:

    • Developed age-specific ME requirement models incorporating body weight, temperature, and daily weight gain.
    • Models indicated that temperature significantly affects maintenance ME requirements.
    • Feeding trials showed that the developed models predicted energy intakes that supported body weights close to, or slightly below, breeder recommendations.
    • One model (Model 2) demonstrated the best prediction accuracy for ME requirements and resulted in body weights closest to the standard recommendation.

    Conclusions:

    • The developed factorial models provide a more accurate estimation of ME requirements for broiler breeder pullets compared to general breeder recommendations.
    • Environmental temperature is a key factor to consider in ME requirement calculations for pullets.
    • Model 2 offers a reliable tool for optimizing feeding strategies and managing body weight in broiler breeder pullets.