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Masuda Tsuneyuki |
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Validating Prevention of the Spread of Enzootic Bovine Leukosis on a Farm in Tottori Prefecture
Tsuneyuki Masuda, Natsuki Akashi, Moegi Kuroda, Ayako Okada, Yuzo Oshimo, Yasumitsu Masuda, Satoshi Sekiguchi
In 2017, one dairy farm initiated measures for preventing the spread of enzootic bovine leukosis (EBL). Subsequently, bovine leukosis virus (BLV) antibody prevalence on this farm decreased from 11.8% to 2.4% over 3 years. The prevalence of the DRB3*0902 allele, one of the resistance-associated alleles, was 15.4% on the farm, significantly higher than that of the dairy cattle surveyed in this study. In addition, the segregation of seropositive cattle from the seronegatives was deemed to be an effective method for preventing horizontal transmission of BLV. Further, replacement of seropositives was predictably effective at decreasing antibody prevalence on the farm. ─ Key words : antibody prevalence, bovine leukosis virus, DRB3*0902, enzootic bovine leukosis.
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