《Table 1 Content of Selenium in feed, water and soil of different pastures (mg·kg-1)》

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《Distribution of Selenium and Mercury in Heilongjiang Province and Its Effect on Body of Beef Cattle》

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"；–"；indicates that no samples are collected.The same as below.

The contents of different pasture Selenium in feed，water and soil are presented in Table 1.The content of Se in corn stalk was between 0.02 and 0.72 mg·kg-1；Selenium content in DDGS was between 0.03 and0.34 mg·kg-1；pasture one was slightly lower than the corresponding value 0.4 mg·kg-1 of NRC beef cattle feed ingredients.While pasture four was higher than the corresponding value.As for wheat bran，all the pastures were lower than NRC beef cattle feed ingredients value 0.83 mg·kg-1.The contents of Se in soybean meal at all pastures were higher than NRC beef cattle feed ingredients value 0.22 mg·kg-1.At all the pastures of Se content in drinking water were between 0.04 and 2.1μg·L-1.Compering with the feed composition of NRC beef cattle，the content of Se in samples such as distillers&apos；grains was different.Concentrated supplement material was the cattle pastures basing on requirements to purchase a feed of semi-finished products，so its Se content was relatively high.Mixed with roughage，it could achieve the recommended amount of beef cattle feeding standard0.1-2 mg·kg-1，the content of Se was between 0.11and 0.41 mg·kg-1 in TMR was also a direct proof of this point.