Abstract
Summary A survey was conducted in 7 counties in Virginia and 4 counties in Maryland to determine relationships among blood selenium concentrations and management and dietary factors which significantly affect blood selenium concentrations. Three-hundred-and-forty-six horses were randomly sampled and a questionnaire of management/husbandry practices was obtained from each farm included in the study. Blood selenium concentrations (± sd) for the population surveyed ranged from 0.027 µg/ml to 0.266 µg/ml with a mean of 0.125 ± 0.043 µg/ml. Factors significantly affecting blood selenium concentration included feeding supplements, origin of hay and amount of time spent on pasture. There was also evidence that level of exercise and gender of the horse may contribute to differences in blood selenium concentrations.
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