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Journal of Nutrition Vol. 93 No. 1 September 1967, pp. 60-64
Copyright © 1967 by American Society for Nutrition
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Serum Selenium and Related Parameters of Naturally and Experimentally Fed Horses1

Howard D. Stowe

Department of Veterinary Science, College of Agriculture and Home Economics, University of Kentucky, Lexington, Kentucky

A survey was made of serum selenium levels and some related parameters of naturally and experimentally fed horses as part of a study to determine the significance of selenium in light-horse nutrition. Serum selenium levels of suckling foals and naturally fed weanlings, yearlings, trainees, adult mares and stallions were 7.00, 14.7, 13.1, 12.4, 12.7 and 12.1 µg Se/100 ml serum, respectively. Orphaned foals fed a commercial milk replacer had 16.25 µg Se/100 ml. Foals fed a selenium, vitamin A- and vitamin E-deficient semipurified ration containing 33% Torula yeast had serum selenium values (µg/100 ml) of 3.68 in unbedded concrete floor stalls, 7.40 in straw-bedded stalls, and 17.33 in tobacco stem-bedded stalls. Foals fed the semipurified ration supplemented with 0.5, 1 and 2 ppm selenium (as sodium selenite) had serum selenium values of 14.68, 15.30 and 16.67 µg/100 ml, respectively. By selenium repletion-depletion techniques using parenterally administered selenium, an equine selenium requirement was estimated at 2.4 µg/kg body weight/day. The SGOT reducing effects of a single intramuscular injection of selenium occurred over a 45-day period.

1 Supported in part by a grant from The Grayson Foundation, Inc., and approved for publication by the Director of the Agricultural Experiment Station, University of Kentucky, as journal paper no. 67-4-16.

Manuscript received 13 February 1967.


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S. M. Richardson, P. D. Siciliano, T. E. Engle, C. K. Larson, and T. L. Ward
Effect of selenium supplementation and source on the selenium status of horses
J Anim Sci, July 1, 2006; 84(7): 1742 - 1748.
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