We add different concentration exogenous selenium(Na 2SeO 3) to the milk cow serum of selenium deficiency in this experiment and analyze the activity of GSH-Px.

• 实验通过在缺硒地区奶牛血清中添加一定量外加硒 (Na2 SeO3 )测其谷胱甘肽过氧化物酶活力。