Bioavailability of Zinc in Two Zinc Sulfate By-Products of the Galvanizing Industry

Hardy M. Edwards, Stephanie D. Boling, Jason L. Emmert, David H. Baker

Research output: Contribution to journalArticle

Abstract

Two Zn depletion/repletion assays were conducted with chicks to determine the relative bioavailability (RBV) of Zn from two new by-products of the galvanizing industry. Using a soy concentrate-dextrose diet, slope-ratio methodology was employed to evaluate two different products: Fe-ZnSO4·H2O with 20.2% Fe and 13.0% Zn, and Zn-FeSO4·H2O with 14.2% Fe and 20.2% Zn. Feed-grade ZnSO4·H2O was used as a standard. Weight gain, tibia Zn concentration, and total tibia Zn responded linearly (P < 0.01) to Zn supplementation from all three sources. Slope-ratio calculations based on weight gain established average Zn RBV values of 98% for Fe-ZnSO4·H2O and 102% for Zn-FeSO4·H2O, and these values were not different (P > 0.10) from the ZnSO4 standard (100%). Slope-ratio calculations based on total tibia Zn established average Zn RBV values of 126% for Fe-ZnSO4·H2O and 127% for Zn-FeSO4·H2O, and these values were greater (P < 0.01) than those of the ZnSO4 standard (100%). It is apparent that both mixed sulfate products of Fe and Zn are excellent sources of bioavailable Zn.

Original languageEnglish (US)
Pages (from-to)1546-1549
Number of pages4
JournalPoultry science
Volume77
Issue number10
DOIs
StatePublished - Oct 1998

Keywords

  • Bioavailability
  • Iron
  • Slope-ratio assay
  • Zinc
  • Zinc sulfate

ASJC Scopus subject areas

  • Animal Science and Zoology

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