methemoglobin, hematocrit and percent hemolysis of erytrocytes were measured in the hlood samples taken from the control and experimental groups (after one hour of sodium nitrite injection).In the experimental group, the leve! of methemoglobin and percent hemolysis of erytrocytes were significantly higher than those in control group. However, values of erytrocyte, hemoglobin and hematoerit were decrease by sodium nitrite injection and these differences were also found statisticaly sign~fi-cant.