Objective To develop selenium-deficient BALB/c mice by feeding with self-made selenium-deficient diet.Methods\ A selenium-deficient mouse food was prepared with local yeast.Young BALB/c mice were fed with the selenium-deficent diet for over 4 months.Selenium concentrations in the blood,liver,and myocardial tissue of the mice fed with selenium-deficient diet were examined.The myocardial enzymes in the treated mice were examined.The ultrastructures of the treated mice myocardial tissues were also observed.Res...