The relationship between parturition and the onset of bovine leukosis
Previous studies have shown that a stressful situation, such as parturition, is considered one of the risk factors for the onset of bovine leukosis [10, 11]. In this study, to examine the relationship between parturition and the onset, we analyzed the onset time of 68 cases which were diagnosed with bovine leukosis. As shown in Figure 1, 28 of the 68 specimens (41.18%) developed bovine leukosis during two months before and after delivery (Figures 1a and 1b). These results suggest the association of parturition with the progression to the clinical stage in BLV-infected cattle, although the detailed mechanisms are still unclear.