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The Value of Aureomycin and Vitamin B₁₂ in Milk Replacement Formulas for Dairy Calves^1,2

Pennsylvania Agricultural Experiment Station

ABSTRACT

Addition of different levels and types of aureomycin supplementation to a milk replacement formula significantly increased the rate of gain in weight of dairy calves until they were 12 wk. of age. Aureomycin supplementation in this trial had its greatest growth promoting effect during the first 4 wk. of the replacement feeding. Aureomycin-fed calves generally were stimulated to a greater consumption of calf starter compared to their controls during the aureomycin feeding period. Aureomycin supplementation of a milk replacement feed resulted in an earlier and increased firmness of the feces. Supplementation of the milk replacement feed with vitamin B₁₂ did not increase growth rates.

¹ The cooperation and support of the Lederle Labs., Pearl River, N. Y., is acknowledged and appreciated.

² Taken from data presented in a thesis to the graduate faculty of The Pennsylvania State College by S. Bloom in partial fulfillment of the requirements for the degree of Master of Science. Authorized for publication as paper no. 1733 in the Journal Series of the Pennsylvania Experiment Station.

³ Present address: Department of Animal Husbandry, Iowa State College, Ames.