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Related Experiment Videos

Reduced dietary phosphorus levels for layers

J D Summers1

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

Poultry Science
|December 1, 1995
PubMed
Summary
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Low dietary phosphorus levels significantly reduced egg production in White Leghorn hens after 32 weeks. Reducing available phosphorus (P) by 20% also decreased phosphorus excretion, indicating improved P utilization.

Area of Science:

  • Animal Science
  • Poultry Nutrition
  • Avian Physiology

Background:

  • Dietary phosphorus is crucial for poultry health and egg production.
  • Optimizing phosphorus levels in feed is essential for economic viability and environmental sustainability.
  • White Leghorn hens have specific nutritional requirements for optimal performance.

Purpose of the Study:

  • To investigate the effects of low dietary phosphorus on White Leghorn hen performance.
  • To determine the threshold for available phosphorus in corn-soybean meal diets.
  • To assess phosphorus excretion in hens fed varying phosphorus levels.

Main Methods:

  • Two experiments were conducted with White Leghorn hens aged 18 to 64 weeks.
  • Diets with varying available phosphorus levels (.2%, .3%, and .4%) were fed.

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  • Egg production, shell quality, egg weight, and phosphorus excretion were measured.

    • Main Results:

    • A diet with .2% available phosphorus reduced egg production after 32 weeks but not at earlier stages.
    • Diets with .3% and .4% available phosphorus showed no significant differences in performance variables.
    • Hens fed lower phosphorus diets exhibited a 20% reduction in phosphorus excretion.

    Conclusions:

    • Available phosphorus levels below .3% negatively impact White Leghorn hen egg production beyond 32 weeks.
    • Reducing dietary phosphorus can significantly decrease phosphorus excretion in poultry.
    • Optimal dietary phosphorus levels are critical for sustained egg production and reduced environmental impact.