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The Evaluation of an Unidentified Growth Factor and Terramycin for Young Dairy Calves^{1, 2}

University of Kentucky³

Abstract

Thirty-two 2-day old calves (8 Jerseys and 24 Holsteins) were raised to 86 days of age in a study to evaluate a source of an unidentified growth factor for young dairy calves. The source of the factor was a mixture of products from terramycin and streptomycin fermentations. Groups of calves fed crystalline terramycin and terramycin in combination with the unidentified growth factor were also included in the study.

Neither crystalline terramycin, the unidentified growth factor nor these two in combination had any significant effect on average daily gain, skeletal growth, feed consumption or efficiency of feed utilization. The average daily gain in pounds per calf of the animals in the various groups was as follows: control, 1.20; terramycin, 1.15; unidentified growth factor, 1.18; terramycin and the unidentified growth factor in combination, 1.27.

Terramycin appeared to exert a preventive influence on the incidence of scours. Under the conditions of this experiment the unidentified growth factor studied did not appear to be required by young dairy calves.

¹ Supported in part by a grant from Charles Pfizer and Company, Terra Haute, Indiana. We wish to express appreciation to the Distillers Feed Research Council, Cincinnati, Ohio for supplying the distillers solubles used in this study.

² The investigation reported in this paper is in connection with a project of the Kentucky Agricultural Experiment Station and is published by permission of the Director.

³ Dairy Section, Lexington.