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Corncobs with Aureomycin as Roughage Compared to Hay for Dairy Heifers

Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

Twelve dairy heifers were fed experimental rations for a 24-week period to compare corncobs with bromegrass hay as the source of roughage. Aureomycin was fed to half of the heifers in each roughage group. Protein, mineral, and vitamin supplements were mixed with the corncobs to make the mixture equivalent to the hay in nutritive values.

The rations containing cobs and extra supplements compared favorably with bromegrass hay rations. The average daily gains were 1.59 lb. for the cob rations and 1.46 lb. for the hay rations. The addition of aureomycin did not increase the live weight gains. Differences in gains were not statistically significant.