Three types of material were used in this study. The first group contained the blood smears obtained from 69 cattle which were suspected to be infected with blood parasites. Second group consisted of rthe blood smears obtained from 261 cattle showing no elinical symptom of any disease. The last group contained lymph node, liver and spleen smears of 4 cattle in which some symptom related with blood parasites were seen after slaughtering in the slaug'hterhouse.

All smears were microscopically examined after fixing with methyl alcohol and staining with giemza.

In the first group, the elinical infections caused by Theilaria annulata, T. annulata + T. mutans, Babesia bigemina, T. mutans + B. bigemina and T. annulata + T. mutans +B. bigemina were 28.98 %, 20.28%, 1.45 %. 1.45% and 1.45% respectively. The latent infections caused by. T. annulata, T. mutans and T. annulata + T. mutans were 5.97 %, 11.59 % and 4.34% respectively in the same group.

In the second group, the latent infections caused by T. mutans, T. annulata + T. mutans and T. annulata were 36.78 %, 19.54% and 2,30 % respectively.

T. annulata was seen in 2 out of 4 cattle and B. bovis in the other two cattle in the last group.

Clinical infections were found in every age of cattle after 15 days of age, especially in May, June and July. Latent infections were seenin every age of cattle, following one year of age in all season.