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The Effect of Aureomycin Feeding on Changes in Weight and in Body Measurements of Dairy Calves^{1, 2,}

Iowa Agricultural Experiment Station, Ames

ABSTRACT

The growth-stimulating effect on young dairy calves of orally administered aureomycin has been demonstrated by numerous investigators (1, 9, 10, 12, 14), whereas with older dairy cattle and with other ruminants the data are neither so extensive nor so conclusive. Although adverse effects were observed when aureomycin was fed to steers (2) and to lambs (4, 5, 6), favorable responses have been reported when this antibiotic was administered to ruminating dairy calves (8, 11) and no adverse effects were noted when it was fed to dairy cows (7). Inasmuch as further study of the effects of antibiotics on older dairy animals seemed desirable, the present investigation was undertaken to determine the responses of ruminating dairy calves (a) to continued aureomycin supplementation over a comparatively long period of time, (b) to introduction of aureomycin into the diet and (c) to removal of aureomycin from the diet.

EXPERIMENTAL

Thirty-two dairy calves which had been employed in an earlier study (10) were divided at 116 days of age into four comparable groups with breed and sex: distribution as shown in table 1.

¹ Journal paper no. J-2126 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project no. 814.

² Supported in part through funds provided by Lederle Laboratories Division, American Cyanamid Co., Pearl River, N. Y., and by Western Condensing Co., Appleton, Wis.

³ Present address: Ottawa Dairy Div., The Borden Co. Ltd., Ottawa, Can.