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The Effect of Different Levels of Dietary Oxytetracycline on the Growth of Young Dairy Calves¹

Vermont Agricultural Experiment Station³

Abstract

Feeding a supplement containing oxytetracycline to dairy calves at the rate of 15 mg. or 60 mg. per 100 lb. of body weight did not result in a significant difference in rate of gain between the two levels of feeding. Furthermore, the antibiotic produced only a slight though insignificant increase in gain over the controls under the conditions of this experiment. This lack of growth response was probably due to a reduction or elimination of certain low-grade pathogens in the Station calf herd as a result of the continuous feeding of antibiotics to most calves during the previous two years.

¹ The project was supported in part by funds provided by Chas. Pfizer & Co., Inc., Brooklyn, N. Y. Journal Series Paper No. 51.

² Present address: Department of Animal Industry, North Carolina State College of Agriculture, Raleigh, N. C.

³ Departments of Dairy Husbandry and Animal Pathology, Burlington, Vermont.