| Peripheral lymphocyte counts in Holstein-Friesian cattle infected with bovine leukemia virus in Korea |
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Guk-hyun Suh1, Chung-gil Lee2, Chai-yong Lee2, Tai-young Hur1, Jeong-chi Lee3, Seog-jin Kang1, Dong-soo Son1, Byeong-seog Ahn1, Nam-chul Kim1 |
1National Livestock Research Institute, RDA
2College of Veterinary Medicine, Chonnam National University
3Department of Veterinary Nurse and Pets Science, Seojeong College |
| Bovine leukemia virus에 감염된 우리 나라 젖소의 말초혈액 내 림프구 수 |
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서국현1, 이정길2, 이채용2, 허태영1, 이정치3, 강석진1, 손동수1, 안병석1, 김남철1 |
1농촌진흥청 축산연구소
2전남대학교 수의과대학
3서정대학 애완동물과 |
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| Abstract |
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Hematologic investigations were made on the blood samples taken from bovine leukemia virus (BLV)-seropositive Holstein-Friesian cattle in Korea, and their absolute lymphocyte count was compared with that of BLV-seronegative cattle. The incidence of persistent lymphocytosis (PL) was also determined. The normal bovine lymphocyte count was established on the basis of studies of 656 blood samples taken three times from 297 seronegative animals aged from 0~6 months to over 5 years at 5~6-month intervals. The data were examined according to 7 age groups of samples placed into their respective age groups. A peak in average total count was reached at 6~12 months ($5.36{ imes}10^3/{mu}l$) and thereafter the count declined continuously until over 5 years ($3.17{ imes}10^3/{mu}l$). From the results, 99.74 percent limits were calculated, and the upper limit of the range was chosen as the cutoff point for lymphocytosis. A PL was defined as a lymphocyte count that exceeded the above 99.74 percent limits and persisted over an interval of at least three months. The criterion for PL was applied to classifying 515 blood samples obtained four times from 189 seropositive animals without clinical signs at 5~7-month intervals. It was found that 54 (28.5%) of seropositive animals were with PL; cattle with PL were in age groups of 2~3 years to over 5 years. |
| Key Words:
bovine leukemia virus, absolute lymphocyte, incidence, persistent lymphocytosis, Holstein-Friesian cattle, Korea |
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