Norman B, Nader G, Oliver M, Delmas R, Drake D, George H
School of Veterinary Medicine, University of California, Davis 95616.
J Am Vet Med Assoc. 1992 Sep 15;201(6):869-72.
The potential impact on aquatic ecosystems of supplementing the diets of beef cattle with selenium (Se) was studied on 4 northern California ranches. All study sites included an area of concentrated use by cattle that had diets supplemented with Se. In each case, a stream flowed through the site and provided a control sampling area upstream and a treated sampling area downstream. Specimens of water, sediment, algae, aquatic plants, aquatic invertebrates, and fish were analyzed fluorometrically for total Se content. Significant differences in Se concentration were not found between specimens from upstream control areas and those from downstream areas subjected to use by Se-treated cattle. Evidence was not found that Se supplementation in cattle at maximal permitted concentrations caused Se accumulation in associated aquatic ecosystems.
在加利福尼亚州北部的4个牧场研究了用硒（Se）补充肉牛日粮对水生生态系统的潜在影响。所有研究地点都包括一个肉牛集中使用且日粮添加了硒的区域。在每种情况下，都有一条溪流流经该地点，并在上游提供一个对照采样区域，在下游提供一个处理过的采样区域。对水、沉积物、藻类、水生植物、水生无脊椎动物和鱼类样本进行荧光分析，以测定总硒含量。未发现上游对照区域的样本与下游经硒处理的牛使用区域的样本之间硒浓度存在显著差异。没有证据表明以最大允许浓度给牛补充硒会导致相关水生生态系统中硒的积累。
