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Twenty-four Holstein bull calves were fed a milk replacer diet to assess the effects of Cr on calf performance and metabolism of glucose. Treatments consisted of no supplemental Cr (control) or 0.4 mg/kg of dry matter of supplemental Cr from CrCl3 or from a Cr-nicotinic acid complex. Supplementation with the Cr-nicotinic acid complex increased the average daily gain and feed efficiency from d 28 to 42, but not over the entire 63-d performance phase. Calves that were fed diets supplemented with CrCl3 or the Cr-nicotinic acid complex had lower plasma glucose concentrations at 45 to 180 min after an i.v. infusion of insulin than did controls. Calves fed diets supplemented with the Cr-nicotinic acid complex also had lower plasma glucose concentrations from 90 to 180 min after insulin challenge than did calves that were fed diets supplemented with CrCl3. After an i.v. infusion of glucose, calves that were fed diets supplemented with CrCl3 had lower serum insulin concentrations at 10 to 25 min after challenge than did controls or calves that were fed diets supplemented with the Cr-nicotinic acid complex. However, the glucose clearance rate after glucose infusion was not affected by Cr supplementation. Chromium supplementation did not markedly affect the performance of calves, but the Cr-nicotinic acid complex and CrCl3 did intensify the response to insulin administered i.v.
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Accepted: November 26, 1996
Received: June 12, 1996
© 1997 American Dairy Science Association. Published by Elsevier Inc.
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