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Related Experiment Videos

Rearing early maturing pullets.

J D Summers1, S Leeson, D Spratt

  • 1Department of Animal and Poultry Science, University of Guelph, Ontario, Canada.

Poultry Science
|November 1, 1987
PubMed
Summary
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Dietary energy intake, not protein, is key for pullet weight gain and carcass composition. Adequate energy is crucial for triggering sexual maturation in young chickens.

Area of Science:

  • Poultry Science
  • Animal Nutrition
  • Avian Physiology

Background:

  • Pullet development is crucial for subsequent reproductive performance.
  • Understanding nutritional and environmental factors influencing pullet growth is essential for the poultry industry.

Purpose of the Study:

  • To investigate the impact of dietary energy and protein levels, along with feeding management, on the body weight and carcass composition of White Leghorn pullets at 16 weeks of age.
  • To identify critical nutrients and growing conditions that influence pullet development and readiness for production.

Main Methods:

  • Experiments were conducted using White Leghorn pullets.
  • Various dietary energy levels and protein concentrations (including methionine supplementation) were tested.
  • Different feeding regimens, including ad libitum feeding every other day and diluted diets, were applied.

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Main Results:

  • Body weight gain and carcass composition were strongly correlated with dietary energy intake, irrespective of energy level.
  • Protein content, even as low as 15% with methionine, did not significantly affect 16-wk body weight compared to 21% protein diets.
  • Restricted feeding (every other day) resulted in significantly lower body weights compared to full feeding.

Conclusions:

  • Dietary energy, rather than protein, is the critical nutrient influencing pullet weight gain and carcass composition.
  • Pullets require specific body weight and carcass composition thresholds to initiate sexual maturation.
  • Feeding management significantly impacts pullet growth and development.