Bovine theileriosis is a tick-borne disease caused by protozoan parasite of the genus Theileria. Seven deoni calves affected with Theileriosis. The calves shows clinical signs such as pyrexia, anorexia, anemia, pale mucus membrane, enlarged lymph node, general weakness, lameness and difficulty in getting up etc. The diagnosis was done by blood smear examination and lymph node smear examination. Animals were treated with buparvaquone injection along with symptomatic and supportive therapy. The infection can be fully cured with early detection, appropriate medication and control of ticks.