However, the risk of BLV-infected bulls transmitting the virus is unknown. The objective of this study was to evaluate the potential for BLV transmission during natural breeding between a BLV-infected bull and uninfected heifers.
Xenotropic Murine Leukemia Virus-Related Virus as a Case Study: Using a Precautionary. Risk Management Approach for Emerging Blood-Borne Pathogens in Canada. Michael G. Tyshenko et al.

Epidemiology and Transmission of Feline Leukemia Virus Disease.The virus is transmitted via close contact among cats. The virus is most commonly shed in saliva, with less common sources of virus including nasal secretions, milk, urine, and feces.

While much about the virus remains unknown, it is related to other viruses that can cause serious health conditions. Diagnosis involves blood tests, and treatment focuses on managing symptoms. Preventive measures include safe practices to reduce transmission risk.

How Feline Leukemia Virus Is TransmittedYour Cats Risk FactorsLearn about cat FIV, including the causes, symptoms, treatments, and transmission.
Review of bovine leukemia virus (BLV) transmission1 housing of dairy calves in hutches during the winter bovine leukosis have highest risk for transmission (Sargeant et al., 1997), or group feeding dairy heifers a TMR in communal feed bunks (Erskine et al., 2012a).
Risk factors for feline leukemia virus and feline immunodeficiency virus infections.Although casual transmission of the viruses via the environment is unlikely, both viruses are transmitted very efficiently via contami-nated body fluids, especially blood.