title: Nutritional evaluation of copper-lysine and zinc-lysine complexes for chicks.
abstract: 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.
authors.affiliation: Department of Animal Sciences, University of Illinois, Urbana 61801.
authors.forename: S
authors.initials: S
authors.lastname: Aoyagi
authors.forename: D H
authors.initials: DH
authors.lastname: Baker
mesh_terms: 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*
chemical_list: D003300:Copper; D015032:Zinc; D008239:Lysine