Nutritional evaluation of copper-lysine and zinc-lysine complexes for chicks.
Three chick experiments were conducted to evaluate two mineral-Lys complexed products, Cu-Lys and Zn-Lys. Relative bioavailability of Lys, Cu, and Zn were assessed separately using diets specifically deficient in each of these nutrients and by employing criteria that respond in a straight-line fashion to supplementation with the nutrient in question. Common-intercept multiple linear regression (slope-ratio) of weight gain, bile Cu concentration, and total tibia Zn regressed on supplemental intake of Lys, Cu, and Zn, respectively, were used to assess bioavailability values relative to the standards (i.e., L-Lys.HCl, CuSO4.5H2O, and ZnSO4.H2O). Lysine bioavailability of Cu-Lys and Zn-Lys were estimated as 89 and 109%, respectively, which were not different (P > .05) from 100%. Relative bioavailability of Cu in Cu-Lys and Zn in Zn-Lys were estimated as 120 and 106%, respectively. These values were not different (P > .05) from the standards, i.e., CuSO4.5H2O for Cu and ZnSO4.H2O for Zn.
Aoyagi
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Department of Animal Sciences, University of Illinois, Urbana 61801.
Baker
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DH
D000818:Animals; D002645:Chickens / Q000254:growth & development / Q000378:metabolism*; D003300:Copper / Q000493:pharmacokinetics*; D004435:Eating; D005069:Evaluation Studies as Topic; D005260:Female; D008239:Lysine / Q000493:pharmacokinetics*; D008297:Male; D009753:Nutritive Value; D015430:Weight Gain; D015032:Zinc / Q000493:pharmacokinetics*
D003300:Copper; D015032:Zinc; D008239:Lysine