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Related Experiment Videos

High available phosphorus corn and phytase in layer diets.

N Ceylan1, S E Scheideler, H L Stilborn

  • 1Department of Animal Sciences, University of Nebraska, Lincoln, Nebraska 68583-0908, USA.

Poultry Science
|May 24, 2003
PubMed
Summary

High available phosphorus (HAP) corn, with its higher nonphytate phosphorus (NPP), supports equal egg production compared to normal corn. HAP corn also reduces phosphorus excretion, benefiting the environment.

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Area of Science:

  • Animal Science
  • Nutritional Biochemistry
  • Poultry Science

Background:

  • Corn is a primary feed ingredient for poultry.
  • Phytic acid in corn limits phosphorus availability.
  • Developing corn with higher available phosphorus (HAP) can improve nutrient utilization.

Purpose of the Study:

  • To compare high available phosphorus (HAP) corn with normal corn in layer diets.
  • To evaluate the effects of nonphytate phosphorus (NPP) levels and phytase supplementation.
  • To assess impacts on egg production, egg quality, and nutrient excretion.

Main Methods:

  • A 2x5 factorial experiment using HAP corn and normal corn at five NPP levels (0.40% to 0.20% + phytase).
  • Diets fed to Hy-Line W-36 hens from 20 to 40 weeks of age.

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  • Evaluated feed intake, egg production, feed conversion, egg quality, bone ash, and nutrient retention.

    • Main Results:

    • Egg production and feed consumption were unaffected by corn type or NPP level.
    • Feed conversion ratio improved at 0.35% NPP.
    • Egg weight and mass decreased with lower NPP levels.
    • HAP corn reduced excreta phosphorus and improved shell quality with phytase.
    • HAP corn reduced Ca, Zn, Cu, and Mn retention, but phytase alleviated this.

    Conclusions:

    • HAP corn supports equivalent egg production to normal corn with reduced phosphorus excretion.
    • HAP corn allows for lower dicalcium phosphate supplementation in layer diets.
    • Phytase supplementation benefits low NPP diets by improving mineral retention and shell quality.