Bioavailability of zinc in two zinc sulfate by-products of the galvanizing industry.
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 x H2O with 20.2% Fe and 13.0% Zn, and Zn-FeSO4 x H2O with 14.2% Fe and 20.2% Zn. Feed-grade ZnSO4 x 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 x H2O and 102% for Zn-FeSO4 x 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 x H2O and 127% for Zn-FeSO4 x 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.
Edwards
H M
HM
Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
Boling
S D
SD
Emmert
J L
JL
Baker
D H
DH
D000818:Animals; D001682:Biological Availability; D002645:Chickens / Q000254:growth & development*; D019587:Dietary Supplements; D004560:Electricity; D005260:Female; D007221:Industry; D007501:Iron; D008297:Male; D012044:Regression Analysis; D015430:Weight Gain / Q000187:drug effects*; D015032:Zinc / Q000493:pharmacokinetics* / Q000494:pharmacology; D019287:Zinc Sulfate / Q000008:administration & dosage / Q000493:pharmacokinetics* / Q000494:pharmacology
D019287:Zinc Sulfate; D007501:Iron; D015032:Zinc