Selenium in certain soils may be taken up by plants or through food chain in amounts sufficient to make forage toxic to animals. Selenium can be found in semiarid areas on soils typically derived from Cretaceous geologic material in the World wide. Acute poisoning results from consuming plants containing high selenium concentrations, chronic selenium Poisoning has been described in two forms: alkali disease and blind staggers. Alkali disease results from prolonged ingestion containing, 5-40 ppm selenium in inorganic or organic forms. Alkali disease causes loss or hair, lameness, weight loss and probably reduces reproductive efficiency. Blind staggers causes animals to wander, walk in circles, and to have difficulty in swallowing; in addition, it may cause blindness. Information is presented that questions the attribution of blind staggers to selenium toxicosis. Chronic oral intake of very high levels of selenium (10–20 times more than normal) can produce selenosis in humans, the major effects of which are dermal and neurological.

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NLN murthy is research scholar of dept. of Zoology,published 10 research articles in reputed journals.Dr. S. Kishore is currently working as Assist. Professor In Dept. Zoology, S.V.University, he has published more than 30 research articles in peer reviewed journals and 05 Ph.D's under his supervison. Dr. V.B.Reddy, Study Investigator, CVSc, SVVU,

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