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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...