Selenium (Se) concentration in whole blood, blood serum and erythro cytes of sheep were monitored for 12 weeks after selenium and Vit. E. supplementation. Significant increase in selenium concentration in whole blood, blood serum and erythrocytes was found after 4 weeks (PL. 0.05) and 8 weeks (PL 0.01), followed by highly sig nificant increase (P<0.01) after 12 weeks in both selenium suppl emented and Vit. E. Selenium supplemented groups, in comparison to control and Vit. E. suplemented groups.
The results suggested that, selenium concentration in both serum and erythrocytes respond to changes in dietary selenium intake, and the respond was parallel to whole blood selenium concentration. Selenium concentration in both serum and R.C.Cs. can be used to monitore selenium status in farm animals, as erythrocytes selenium concentration can be calculated using new formula.