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Effects of Supplementing a Calf Ration with Trace Minerals, Aureomycin,¹ and Other Dietary Constituents as Measured by Growth and Feed Consumption^,2

Departments of Dairy Husbandry, Veterinary Medicine, and Statistical Laboratory, Kansas Agricultural Experiment Station, Manhattan

ABSTRACT

Because of the interest in aureomycin for feeding dairy calves (13), it seemed advisable to determine what effect this antibiotic would have on hematopoiesis and microscopic anatomy of calves. In a preliminary experiment the blood characteristics of two calves (3 months old) were studied prior to aureomycin feeding. It was found that the values obtained for several of the blood characteristics were below those commonly reported for calves. Feeding trace minerals to these calves produced hematological changes which appeared beneficial. Although there have been a few reports (14) on the effect of the addition of trace mineral elements to calf rations known to be deficient in these minerals, there is a paucity of information on the effect of fortifying common calf rations with trace minerals. This experiment was initiated to study the effects of supplementary trace minerals only and a combination of trace minerals together with major minerals, vitamins, and aureomycin upon certain physiological responses of the calf.

¹ The trademark of Lederle Laboratories Div., American Cyanamid Co., Pearl River, N. Y., for the antibiotic chlortetracycline.

² Contribution No. 237, Dept. of Dairy Husbandry, No. 144, Dept. of Veterinary Medicine, and No. 24, Statistical Laboratory, Kansas Agricultural Experiment Station. A portion of a dissertation presented by the senior author as partial fulfillment of the requirements for the degree Doctor of Philosophy in Animal Nutrition at Kansas State College.

³ Present address: Houston, Texas.