Selenium is one of important elements to life, above 60 kinds of diseases and cancers are related to the lack of selenium. Selenium is distributed widely but extremely unevenly on the earth, 2/3 of area in the world lacks selenium and so does China, of which 1/3 is considered to be in terrible lack of selenium. This situation seriously threatens the health of human beings and the development of animal husbandry. The nutritive level of selenium in human and pultry is determinated by the selenium content in t...
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