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The development of feedstuff retainable phosphorus values for broilers.

K Leske1, C Coon

  • 1Department of Poultry Science, University of Arkansas, Fayetteville, Arkansas 72701, USA.

Poultry Science
|November 29, 2002
PubMed
Summary
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Poultry diets need accurate phosphorus (P) values, considering both nonphytate P and phytate P utilization. This study determined P retention and requirements in broilers to optimize diets and reduce P excretion.

Area of Science:

  • Animal Nutrition
  • Poultry Science
  • Nutrient Metabolism

Background:

  • Current poultry phosphorus requirements are based on nonphytate phosphorus (NPP), potentially underestimating phytate phosphorus utilization.
  • Accurate phosphorus retention values for feed ingredients and poultry are crucial for formulating diets that meet nutritional needs while minimizing environmental phosphorus excretion.

Purpose of the Study:

  • To determine phosphorus retention from calcium phosphates in broilers.
  • To establish retainable phosphorus requirements for different broiler growth stages.

Main Methods:

  • A bioassay using 10-day-old male broilers fed varying levels of monocalcium phosphate (MCP) in a semi-synthetic diet.
  • Collection and analysis of diet and excreta for total phosphorus, phytate phosphorus, and acid-insoluble ash.

Related Experiment Videos

  • Determination of phosphorus retention using regression analysis and bone strength measurements.

    • Main Results:

    • Basal diet phosphorus retentions were 43.2% (total), 65.5% (NPP), and 32.3% (phytate).
    • Maximum retentions for total P, NPP, and MCP-P reached 67.6%, 80.2%, and 98%, respectively.
    • Retainable phosphorus requirements were determined as 0.39% for 0-3 week chicks and 0.30% for 3-6 week broilers.

    Conclusions:

    • Phosphorus retention from feed ingredients is influenced by the amount included in the diet.
    • Accurate assessment of both NPP and phytate phosphorus is essential for precise poultry diet formulation.
    • Established retainable phosphorus requirements can optimize broiler nutrition and reduce environmental P output.