Ef®cacy of chromium-yeast supplementation for growing beef steers
نویسندگان
چکیده
This experiment was conducted to determine the ef®cacy of feeding chromium yeast to growing beef steers. Animal growth, gain ef®ciency, and blood glucose kinetics were determined in 24 beef steers (initial body weight253 4 kg) fed a corn silage-based diet supplemented with 0 (control), 100, 200, or 400 mg chromium from high-chromium yeast/kg of diet dry matter. Intravenous glucose tolerance tests (IVGTT) and intravenous insulin challenge tests (IVICT) were conducted at 3 and 6 weeks of chromium-yeast supplementation. There were minimal effects on plasma glucose kinetics during IVGTT and IVICT. There were tendencies for glucose clearance rate to increase (p0.16) and half-life to decrease (p0.14) during IVICT. However, chromium-yeast supplementation had no effect (p>0.24) on ADG and gain ef®ciency, suggesting that chromium-yeast supplementation to unstressed growing calves may not be bene®cial. # 2000 Elsevier Science B.V. All rights reserved.
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