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Effects of low phytate barley (Hordeum vulgare L.) on zinc utilization in young broiler chicks.

L B Linares1, J N Broomhead, E A Guaiume

  • 1Department of Animal Sciences, University of Missouri, Columbia, Missouri 65211, USA.

Poultry Science
|January 20, 2007
PubMed
Summary
This summary is machine-generated.

Low phytate barley (LPB) significantly improved zinc and phosphorus utilization in broiler chicks compared to wild-type barley (WTB). This enhanced mineral absorption was not attributed to endogenous phytase activity in the LPB.

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Area of Science:

  • Animal Nutrition
  • Poultry Science
  • Agricultural Science

Background:

  • Phytate in barley can limit zinc (Zn) and phosphorus (P) bioavailability in broiler diets.
  • Low phytate barley (LPB) is a potential alternative to reduce phytate-induced mineral deficiencies.
  • Understanding the role of endogenous phytase in LPB is crucial for its effective utilization.

Purpose of the Study:

  • To evaluate the effects of LPB on Zn utilization in young broiler chicks.
  • To determine the contribution of endogenous phytase in LPB to improved mineral utilization.
  • To assess the impact of supplemental Zn levels on mineral absorption with different barley types.

Main Methods:

  • Two 21-day experiments using broiler chicks fed diets with either wild-type barley (WTB) or LPB.
  • Factorial arrangements included barley type, supplemental Zn levels (0, 10, 20 mg/kg), and autoclave treatment in experiment 2.
  • Measurements included feed intake, body weight gain, toe and tibia Zn concentration, and P and Zn retention.

Main Results:

  • LPB significantly increased feed intake, body weight gain, and Zn concentration in toes and tibias compared to WTB.
  • LPB substitution increased tibia and toe Zn by 46% and 25%, comparable to 20 mg/kg supplemental Zn.
  • Higher P and Zn retention were observed in chicks fed LPB, with no effect of autoclaving on mineral utilization.

Conclusions:

  • LPB enhances Zn and P utilization in broiler chicks, independent of endogenous phytase activity.
  • LPB can be effectively used to improve mineral bioavailability in poultry diets.
  • Further research may explore optimal inclusion levels of LPB for broiler nutrition.