Abstract
Serum antibodies against bovine leukemia virus (BLV) were examined on 3, 026 cattle from 38 herds of 20 administrative districts of Iwate Prefecture. They were detected positively in 1, 322 cattle (43.7%), which consisted of 411 (38.2%) of 1, 076 dairy cattle and 911 (46.7%) of 1, 950 beef cattle, and which came from 27 herds (71.1%). The positive rate was 9.5 to 100% in each herd. It increased with the advance in age. It was more than 40% in every age group of 3 years or more, except that of 8 years.All 117 cattle affected with enzootic bovine leukosis (EBL) had serum antibodies against BLV. BLV particles were demonstrated from 60 (93.8%) of 64 cattle examined by electron microscopy. The cattle with EBL were from districts close to those highly contaminated with BLV.
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