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Related Experiment Videos

Improving phosphorus availability in soybean meal for broilers by supplemental phytase

D M Denbow1, V Ravindran, E T Kornegay

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

Poultry Science
|November 1, 1995
PubMed
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Supplemental phytase significantly improved broiler growth and feed intake by increasing the availability of phytate phosphorus from soybean meal, especially at lower phosphorus levels. Phytase addition also reduced high mortality rates observed in low-phosphorus diets.

Area of Science:

  • Animal Nutrition
  • Poultry Science
  • Biochemistry

Background:

  • Soybean meal is a primary protein source in broiler diets, but its phosphorus (P) is largely unavailable due to phytate binding.
  • Supplemental phytase is used to enhance phytate P digestibility, but its effectiveness varies with dietary P levels and phytase dosage.

Purpose of the Study:

  • To evaluate the efficacy of supplemental microbial phytase in improving phytate P availability in broiler diets with varying nonphytate P (nP) levels.
  • To determine the relationship between phytase dosage, dietary P concentration, and broiler performance metrics.

Main Methods:

  • A 21-day experiment with 840 male broilers fed semi-purified diets containing soybean meal as the sole protein source.
  • Seven levels of phytase (0-1,200 U/kg) were added to diets with three nonphytate P concentrations (.20, .27, .34%).

Related Experiment Videos

  • Body weight gain, feed intake, gain:feed ratio, mortality, and bone characteristics (ash, shear force) were measured.

    • Main Results:

    • Phytase significantly improved body weight gain and feed intake across all nP levels, with the greatest response at lower P concentrations.
    • Mortality decreased from high levels (35-45%) to normal with 200-400 U/kg phytase in low P diets.
    • Toe and tibia ash, along with tibia mechanical properties, increased with phytase supplementation, indicating improved P utilization.

    Conclusions:

    • Microbial phytase effectively enhances the availability of phytate-bound phosphorus in soybean meal for broilers.
    • The total response to phytase is dependent on both the phytase level and the dietary nonphytate P concentration.
    • Body weight gain and toe ash percentage are sensitive indicators for assessing P equivalency of phytase, with 821 U of phytase equivalent to 1 g of inorganic P.