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Related Experiment Videos

Supplemental microbial phytase improves zinc utilization in broilers

Z Yi1, E T Kornegay, D M Denbow

  • 1Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg 24061-0306, USA.

Poultry Science
|April 1, 1996
PubMed
Summary

Microbial phytase supplementation improved zinc (Zn) retention and utilization in broilers, enhancing body weight gain and Zn deposition in bones and liver. This study developed an equation to quantify the Zn equivalency of phytase, showing approximately 0.9 mg of Zn released per 100 U of phytase.

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Area of Science:

  • Animal Nutrition
  • Biochemistry
  • Poultry Science

Background:

  • Zinc (Zn) is an essential trace element for broiler growth and health.
  • Phytase enzymes can enhance nutrient digestibility and reduce anti-nutritional factors in feed.
  • Understanding the interaction between phytase and Zn is crucial for optimizing broiler diets.

Purpose of the Study:

  • To investigate the effects of microbial phytase on Zn retention and utilization in broilers.
  • To determine the Zn equivalency of microbial phytase in broiler diets.
  • To establish a quantitative relationship between phytase dosage and Zn release.

Main Methods:

  • A 21-day trial with 384 male broilers fed a corn-soybean basal diet.
  • Dietary treatments included varying levels of Zn supplementation and microbial phytase.

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  • Excreta and tissue samples (toe, tibia, liver) were collected for analysis.

    • Main Results:

    • Phytase and Zn supplementation linearly increased body weight gain and feed intake.
    • Zn and phytase improved Zn retention and deposition in bones and liver.
    • A regression equation (Y = 0.20 + 0.0082X) was developed to estimate Zn equivalency of phytase.

    Conclusions:

    • Microbial phytase effectively enhances Zn retention and utilization in broilers.
    • Phytase supplementation can reduce the dietary requirement for supplemental Zn.
    • The study provides a valuable tool for formulating cost-effective broiler diets.