This study, was made to establish the changes in the levels of sodium, potassium, calcium, magnesium, zinc and copper in the serum of the sheep experimentally poisoned with selenium. 15 sheep were used in the investigation. Selenium was given intramuscularly in doses of 0.1, 0.2, 0.4 and 0.6 mg/kg. The blood samples were collected at 0.5, 1, 3, 6, 9, 12, 24, 48, 72 and 120^th hours. These samples were analysed for the levels of sodium, potassium, calcium, magnesium zinc and copper. The potassium and sodium levels in the samples were analysed with flame photometry. The calcium, magnesium, zinc and copper levels in the samples were measured with atomic absorption spectrometry.

In conclusion, the levels of sodium, calcium, magnesium, zinc and copper in serum of the sheep were determined to decrease in the experimentally induced selenium poisoning. On the other hand the level of potassium was found to increase.