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Journal of Dairy Science Vol. 31 No. 12 1062-1067
© 1948 by American Dairy Science Association ®
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The Effect of Supplemental Vitamin A upon Growth, Blood Plasma Carotene, Vitamin A, Inorganic Calcium, and Phosphorus of Holstein Heifers1, ,2

R. H. Ross3 and C. B. Knodt

Department of Dairy Husbandry, Pennsylvania Agricultural Experiment Station, State College4

ABSTRACT

The nutritional value of vitamin A for dairy cattle has been generally accepted and numerous investigators have studied the minimum vitamin A and carotene requirements of calves and heifers for growth. Boyer et al. reported that 75 {gamma} of carotene per kg. body weight was adequate for yearling Holstein heifers. Jones and Haag (5) found that heifers did not require supplemental vitamin A for growth and reproduction if they were pastured during the summer. Keyes et al. (6) obtained more gain in body weight by supplementing a standard calf starter with vitamin A. With this in mind, a study was undertaken to determine the value of supplementing one of the commonly used heifer rations with vitamin A. The effect of supplemental vitamin A upon blood plasma carotene, vitamin A, inorganic calcium and phosphorus concentrations and growth was studied.

EXPERIMENTAL PROCEDURE

A preliminary experiment was conducted with 22 Holstein heifers from February 1 to May 24, 1946.

FOOTNOTES

1 Authorized for publication on October 2, 1947 as Paper no. 1396 in the Journal Series of The Pennsylvania Agricultural Experiment Station

2 The data contained in this paper are from a thesis submitted by the senior author to the Graduate School of The Pennsylvania State College in partial fulfillment of the requirements for the Degree of Doctor of Philosophy, 1947.

3 Now affiliated with the Department of Dairy Husbandry, University of Idaho, Moscow.

4 These studies were financed in part by a grant from The Borden Company, New York.






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Copyright © 1948 by the American Dairy Science Association ®.