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.