CEMENT KILN DUST IN AN ALL-CONCENTRATE DIET FOR FEEDLOT STEERS

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Abstract
Two groups of 16 steers were fed an all-concentrate diet with or without 3.5% cement kiln dust for 125 days. There were no differences (P > 0.05) in overall animal performance between the two experimental groups. Steers fed the cement dust diet and the control diet gained an average of 1.12 and 1.24 kg/day, respectively. Both groups of cattle ate an average of 9.2 kg of feed daily. There was a significant interaction (P < 0.05) between diet and length of time on feed; the cattle which were fed cement kiln dust ate slightly more than the control group in the first two thirds of the experiment and less in the last third of the experiment. Rate of liveweight gain was also lower (P < 0.05) in the cattle fed cement kiln dust in the last third of the experiment. Lead concentrations in kidney tissues were significantly higher (P < 0.01) in the steers fed the cement kiln dust (0.80 mg/kg, wet weight basis) than in the steers fed the control diet (0.36 mg/kg, wet weight basis). The diets had no significant (P > 0.05) effect on lead concentrations in muscle tissue, blood or liver.

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