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Effect of Type of Protein on the Response of Young Dairy Calves to Aureomycin with Data on the Intestinal Microflora¹

Louisiana Agr. Experiment Station, Baton Rouge

ABSTRACT

An aureomycin-supplemented vegetable calf starter containing solvent-extracted soybean oil meal as the main source of protein showed a better growth response and more improved feed efficiency than when it contained either hydraulic or degossypolized cottonseed meal. Aureomycin-fed calves showed a growth increase of 10 to 20 per cent over control calves at 16 weeks of age.

A bacteriological study of the fecal contents has indicated that the mode of action of aureomycin in stimulating calf growth apparently is not due to selective bacterial inhibition of the common bacterial groups of the intestines, namely, coliforms, enterococci, and Clostridium perfringens types. Other microorganisms or other mechanisms may be involved.

¹ This work was supported in part by a grant from the Lederle Lab., American Cyanamid Co., Pearl River, N. Y.

² Present address: Associate Bacteriologist, Mississippi Agricultural Experiment Station, State College, Miss.