Abstract :
The study was conducted on 40 calves during summer season as aclinical cases in Al- Azragia district which is a village of Fallojah city, Al- Anbar province. 37 calves are Friesian breed and 3 are native breed. Diagnosis depends on lymph smear stained with Giemsa taken from mother cows and the calves and the presence of koch blue bodies in the lymphotes. 30 Friesian calves are injected with Butalex (Buparvaquone) at the rate of 2.5 mg/ B.W, IM at the neck region during the incubation period (7- 10 days) at 5- 6 days old of Theileria annulata infection 10 calves served as a control group. 7 of them are died, which are Friesian, after 14- 25 days from symptoms appeared. 3 calves, which are native breeds, are suffer from moderate to severe clinical symptoms but they remain alive. This is revealed the efficiency of Butalex at the rate of 2.5 mg/k.g. B.W.
