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Effects of Adding Small Quantities of Aureomycin (Aurofac) to the Starter of Calves

Animal Industries Department, University of Connecticut, Storrs

ABSTRACT

Twenty-four Guernsey and Holstein calves raised under a limited whole milk system were assigned to one of three starters supplemented with 0, 2.5, and 5.0 lb. of Aurofac 2A per ton. Starter intake was limited to 3 and 4 lb. daily for Guernseys and Holsteins, respectively. Chopped timothy-clover hay was fed ad lib. There were no significant differences among levels in regard to the following growth criteria at either 49 or 91 days of age: gain in weight, increase in height at withers, heart girth, or barrel circumference. Starter consumption was not different among levels at 49 or 91 days. The 0-level calves consumed significantly more hay and somewhat more TDN through 91 days than did the aureomycin calves. Efficiency of gain was significantly higher from 7 through 49 days of age for the calves receiving starter containing 5 lb. Aurofac 2A per ton, but this greater efficiency did not persist when the data through 91 days of age were considered. The presence of aureomycin in the starter did not significantly influence the incidence of scours.

¹ Present address: Animal Industry Department, North Carolina State College, Raleigh.