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Related Experiment Videos

Zinc bioavailability in soybean meal.

H M Edwards1, D H Baker

  • 1Department of Animal Sciences, University of Illinois, Urbana 61801, USA.

Journal of Animal Science
|April 28, 2000
PubMed
Summary
This summary is machine-generated.

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Phytate in soy protein concentrate diets significantly reduced zinc bioavailability in chicks. This study determined the relative zinc bioavailability in soybean meal using chick growth assays, finding higher values in practical diets.

Area of Science:

  • Animal Nutrition
  • Nutritional Biochemistry
  • Feed Science

Background:

  • Phytate, present in plant-based proteins like soy protein concentrate (SPC), can inhibit mineral absorption.
  • Understanding the impact of dietary phytate on zinc (Zn) bioavailability is crucial for formulating effective animal diets.
  • Soybean meal (SBM) is a common protein source, and its zinc bioavailability needs accurate assessment.

Purpose of the Study:

  • To determine the relative bioavailability (RBV) of zinc in dehulled soybean meal (SBM).
  • To compare zinc utilization from SBM in diets with and without phytate.
  • To assess the influence of phytate-containing versus phytate-free diets on zinc bioavailability assays in chicks.

Main Methods:

  • Zinc depletion-repletion growth bioassays were conducted in young chicks.

Related Experiment Videos

  • Two basal diets were used: a phytate-containing soy protein concentrate (SPC) diet and a phytate-free egg white diet.
  • Graded levels of supplemental zinc (ZnSO4 x 7H2O) and soybean meal were added to assess zinc response and calculate RBV.

    • Main Results:

    • Chick weight gain responded linearly to supplemental zinc in both diets.
    • The slope of the weight gain response curve to zinc intake was significantly greater in the phytate-free egg white diet compared to the SPC diet.
    • The relative bioavailability (RBV) of zinc in soybean meal was calculated as 78% using the SPC diet and 40% using the egg white diet.

    Conclusions:

    • Dietary phytate, as present in the SPC diet, markedly reduced the efficiency of utilizing supplemental inorganic zinc.
    • The presence of phytate inflated the calculated RBV of zinc in soybean meal when using the standard curve method.
    • The higher RBV of 78% for zinc in soybean meal obtained with the phytate-containing diet is more relevant for practical corn-SBM animal feeding.