In the endemic area of bovine piroplasmosis in Chonbuk Province, total of 486 heads of Holstein cow selected from 14 farms randomly were examined the infection status of piroplasma and their blood values.
The results obtained were summarized as follows :
1. The etiological agent was only Theileria sergenti and none of the Babesia sp. infection.
2. All of the 486 heads of examined cow were infected with Theileria serenti (100%).
3. In the initial examination of 11 farms in early summer, the means of blood values were as follows; RBC:526±84(10⁴/㎜³), Ht:27.9±2.8%, SP:7 5=0.6g/㎗, WBC: l1586±354/㎜³, and Fibrinogen : 578.5±164.1㎎/㎗.
4. In the second examinations in summer season, the blood values of examined cows had little varieties. But in the winter season, cows housed in the barn, the blood values were greatly increased; RBC: 601±77(10⁴/㎜³), (F-value: 37.186＾(**)), Ht: 30.5±1.3%(F-value: 15.626＾(**)) Hb 12.2±1.3g/㎗(F-value: 5.899＾(**)), SP: 7.4±0.6g/㎗(F-value: 5.05＾(**)).
5. To determine the piroplasma infection in the many herds of cow, the measurement of Ht, Hb, and SP values etc. were more effective and helpful to find the weak cow because the examined process are not only to be easily carry out many samples but also to be done very simple and rapidly.
6. The indications of therapeutic standard values were stablished as follows; the less than 20% in the Ht value, below the 10g/㎗ in the Hb value, and less than 6g/㎗ in SP value.
when the one among the therapeutic standard values, Ht, Hb, and SP was below the therapeutic standard value, the cow was treated with nutriments. When more than two among them were below the therapeutic standard, the cow was treated with Berenil, at once.
In this way, there was no one head which represented clinical signs of piroplasmosis among 486 heads of cow at 14 farms during the year of 1986.
7. In a Korean native cattle infected with Thieleria sergenti seriously, the recovery of blood values was very prolonged by the treatment of Berenil only. But by the transfusion of 300㎖ blood collected from normal cow, the blood values were recovered rapidly
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