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Selenium

Department of Animal Science, Cornell University, Ithaca New York 14850

ABSTRACT

Selenium has long been considered an element toxic to farm animals and since 1957, when Schwarz and Foltz (22) demonstrated its effectiveness in preventing liver necrosis in the rat, has been studied as a "required" element as well (7, 10, 13, 15, 20). Several recent symposia and reviews (2, 3, 5, 16, 17, 21, 24) have covered most aspects of selenium in nutrition: therefore, this paper will attempt to elucidate those areas not previously covered in detail and present a general concept of selenium's present status.

Selenium toxicity. Olson (17) has presented an excellent and brief review of selenium as a toxic factor in animal nutrition. He indicates that toxic effects may result from continuous intake of feeds as low as 5 ppm of selenium and that the occurrence of 5 to 10 ppm in hair of animals on seleniferous-suspect feeds is an indication of possible selenium toxicity.