The Thai Journal of Veterinary Medicine


Serum samples were collected from 624 Japanese black cat- tle 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 immunodifiusion 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 were 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. These results indicated an extensive spread of BLV among Japanese black cattle in the region.

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