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A High Roughage System for Raising Calves Based on the Early Development of Rumen Function. V. Some Effects of Feeding Aureomycin with Different Ratios of Hay to Grain ¹

Department of Dairy Science, Ohio Agricultural Experiment Station, Wooster

ABSTRACT

Numerous reports showing that aureomycin acts as a growth stimulant when included in the ration of young dairy calves have appeared in the literature (1, 3, 4, 5, 7, 16, 19, 22, 25, 30, 31, 32). Although many theories have been advanced, the mode of action of the growth-stimulating effect of aureomycin and other antibiotics is not well understood (8).

In this experiment the purpose was to determine the effect of feeding aureomycin to calves being raised on the high roughage system (15) with different ratios of hay to grain. The criteria selected to measure the effects of aureomycin and the proportion of hay to grain were growth, feed consumption and digestion, efficiency of feed utilization, nitrogen metabolism, the volatile fatty acid content of rumen juice, the thiamine and riboflavin content of both rumen juice and urine, blood sugar, and changes in rating of certain indicator rumen micro-organisms.

Growth responses to aureomycin feeding obtained by various investigators have varied somewhat in magnitude depending on the conditions of the experiments.

¹ Journal article No. 51–53. Approved by the associate director.