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Journal of Dairy Science Vol. 40 No. 2 119-122
© 1957 by American Dairy Science Association ®
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Effect of Streptomycin on Growth of Young Calves1

L. L. Rusoff, F. T. Landagora and Barney Harris, Jr.

Dairy Department, Louisiana Agricultural Experiment Station, Baton Rouge

ABSTRACT

Feeding dairy calves, 30 or 50 mg. of streptomycin sulfate (Merck) daily to 12 weeks of age was investigated. The 30-mg. level stimulated growth only during the first 4 weeks of the animal's life, whereas the 50 mg. level had increased growth by 13% at 12 weeks of age. These values approached significance at the 5% level of probability. The 50-mg. level caused loose feces and rough haircoat.

Leucocyte counts of the animals fed the 50-mg. level of streptomycin were statistically lower than those of the controls (P < 0.05) after 4 weeks of age, whereas the counts of those fed the 30-mg. level, although lower than the controls, were not statistically significant.

FOOTNOTES

1 This study was supported in part by a grant from Merck and Co. Inc., Rahway, N. J.






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Copyright © 1957 by the American Dairy Science Association ®.