Serum Selenium and Related Parameters of Naturally and Experimentally Fed Horses

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Abstract
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.

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