Assessment of Hematological Parameters and Carcass Weight in Bovine Leukemia Virus Infection in Slaughtered Beef Cattle

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  • NOTSU Kosuke
    Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki
  • HASHIDA Shiori
    Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki
  • MITOMA Shuya
    Graduate School of Medicine and Veterinary Medicine, University of Miyazaki
  • KUBO Meiko
    Miyakonojo Livestock Hygiene Service Center
  • ARIKAWA Genki
    Miyakonojo Livestock Hygiene Service Center
  • AGAH Mohammad Aref
    Animal Science Department, Faculty of Agriculture, Badghis Higher Education Institution
  • El-KHAIAT Heba M.
    Faculty of Veterinary Medicine, Benha University
  • MAI Thi Ngan
    Graduate School of Medicine and Veterinary Medicine, University of Miyazaki Faculty of Veterinary Medicine, Vietnam National University of Agriculture
  • NGUYEN Thi Huyen
    Graduate School of Agriculture, University of Miyazaki
  • ELHANAFY Eslam
    Faculty of Veterinary Medicine, Benha University Graduate School of Agriculture, University of Miyazaki
  • DAOUS Hala El
    Graduate School of Medicine and Veterinary Medicine, University of Miyazaki Faculty of Veterinary Medicine, Benha University
  • NORIMINE Junzo
    Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki Center for Animal Disease Control, University of Miyazaki
  • SEKIGUCHI Satoshi
    Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki Center for Animal Disease Control, University of Miyazaki

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Other Title
  • 牛白血病ウイルス感染症がと畜牛の血液性状と枝肉重量に与える影響の評価

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Abstract

<p>Most bovine leukemia virus (BLV)-infected cattle do not have clinical signs (aleukemic AL), but some develop persistent lymphocytosis (PL) and B-cell lymphosarcoma (enzootic bovine leucosis [EBL]). BLV infection is a well-known cause of chronic wasting disease, which is associated with a reduction in milk productivity and immunity in dairy cattle. However, the effect of BLV infection on beef cattle is not clear. The objective of this study was to investigate the effect of BLV infection on the productivity of slaughtered beef cattle. A total of 997 blood samples were collected from cattle in 2 slaughterhouses in Miyazaki prefecture, Japan. BLV-antibodies were tested in these cattle’s blood samples using enzyme-linked immunosorbent assay (ELISA), to identify BLV-infected cattle. We compared blood parameters and carcass weight between BLV ELISA-positive and ELISA-negative cattle in two age groups : young (≤ 60 months) and elder (> 60 months) groups. The results showed that the proportion of ELISA-positive cattle in the young and elder groups were 22.8% and 24.9%, respectively. The number of white blood cells (WBCs) and lymphocytes in ELISA-positive cattle was significantly higher than that in ELISA-negative cattle in the young group. In addition to the number of lymphocytes, the number of monocytes and neutrophils were also significantly higher in BLV ELISA-positive cattle than in ELISA-negative cattle in the elder group. There was no significant difference in the carcass weight between ELISA-positive and ELISA-negative cattle in both groups. The results of this study suggest that BLV infection has an effect on the host immune response in beef cattle.</p>

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