Distribution of antibodies to Bovine leukemia in Japanese black cattle raised in the Southern region of Japan
1988
Takeo Sakai | Hideto Arai (Nihon Univ., Fujisawa (Japan). Faculty of Agriculture and Veterinary Medicine. Dept. of Preventive Veterinary Medicine) | Wattana Wattanavijarn
Serum samples were collected from 624 Japanese black cattle in the Southern region of Japan during a period time of from 1982 to 1984, and antigen titers were determined with bovine leukemia virus (BLV) antigen by the agar-gel immunodiffusion test. An over-all average positive rate against BLV was 23.9 % during this period, however, a tendency to increase year by year. Generally, older individuals showed higher positive rates than younger ones. Antibody-positive rates varied according to the size of farm: a larger herd tended to have higher positive rates. Of 42 paired sera of dam and calf living together, the presence of BLV antibodies was detected in both dam and calf in 5 pairs (11.9 %), in dam only in 6 pairs (14.5 %, and in calf only in 3 pairs (7.1 %), respectively. An extensive spread of BLV among Japanese black cattle in the region was noted
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