Below are the Known Methods of BLV Transmission:

Horizontal Transmission2012-06-12 7D Phase III.1-9077

  • Biting flies
  • Multiple-use hypodermic needles
  • Gouge type dehorning and tattooing
  • Blood exchange during natural breeding
  • Reproductive exam and artificial insemination sleeves contaminated with BLV-infected blood


Vertical Transmission2021_Calf_MSUDairy_CarlsonPhotographer_cropped

  • Colostrum and milk
  • Placental transmission and transmission by blood exchange during birthing


 Go here to learn more about BLV transmission and how to prevent it.