Selenite and selenium yeast as feed supplements for dairy cows
Selenite and selenium yeast as feed supplements for dairy cows
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DOI：
10.1111/j.1439-0442.1997.tb01121.x
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发表时间：
1997-08-01
期刊：
影响因子：
--
通讯作者：
Pehrson, B
中科院分区：
文献类型：
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作者：
Ortman, K;Pehrson, B
通过给25头奶牛以亚硒酸钠或含硒酵母产品的形式补充硒9个月，研究了无机和有机形式硒对奶牛的有效性。第一组（8头奶牛）每天接受3.0 mg硒作为亚硒酸钠，第二组（9头奶牛）接受3.0 mg硒作为硒酵母产品，第三组（8头奶牛）接受0.75 mg硒作为硒酵母产品。氡的总硒含量为0.26-0.32 mg/kg饲料干物质，第I组和第II组，第III组为0.16-0.18 mg/kg饲料干物质。每天补充0.75毫克酵母产品中的硒，可使全血和牛奶中的硒浓度保持在与3.0毫克亚硒酸钠相同的水平，而酵母产品中的3.0毫克硒可使全血中的硒浓度增加约40%，牛奶中的硒浓度增加约100%。给予亚硒酸盐的组的红细胞中谷胱甘肽过氧化物酶的活性与给予酵母产品的组中的任一组中的谷胱甘肽过氧化物酶的活性没有显著差异。每组两头奶牛的组织中硒浓度为边缘至足够，并且补充酵母产品的三头奶牛的组织中硒浓度有升高的趋势。
The availability of inorganic and organic forms of selenium to dairy cows was studied by giving 25 cows supplementary selenium for 9 months either as sodium selenite or as a selenium-containing yeast product. Group I (eight cows) received 3.0 mg selenium as sodium selenite daily, group II (nine cows) received 3.0 mg selenium as the selenium yeast product, and group III (eight cows) received 0.75 mg selenium as the selenium yeast product. The total selenium contents of the radon were 0.26-0.32 mg/kg feed dry matter for groups I and II, and 0.16-0.18 mg/kg for group III. The supplement of 0.75 mg selenium daily from the yeast product maintained the selenium concentrations ofwhole blood and milk at the same levels as 3.0 mg selenium as sodium selenite, and 3.0 mg selenium from the yeast product increased the selenium concentration of whole blood by approximate to 40% and that of milk by approximate to 100%. The activity of glutathione peroxidase in erythrocytes of the group given selenite was not significantly different from that in either of the groups given the yeast product. The concentrations of selenium in the tissues of two cows from each group were marginal to adequate, and there was a trend for the concentrations to be higher in the tissues of thr cows supplemented with the yeast product.