Risk Assessment: Bovine Leukemia Virus (BLV)

A chart to assess various risk factors for BLV transmission in dairy herds.
Risk Assessment: Bovine Leukemia Virus (BLV) - Articles


Biosecurity Risk Assessment - BLV
Check most appropriate box
Low Risk

Moderate Risk

High Risk
Status of BLV in herd, colostrumTest negative. No herd history of clinical disease. Colostrum from negative animals.No known history. Little of no testing data. Colostrum just from dam to her calf.Unknown history. No testing data. Pooled colostrum in calves.
Purchased animalsTest negative and no history in herd of origin.Single test negative and unknown history of herd of origin.No testing and unknown history of herd of origin.
Needles and syringesSingle use. Disposal of needles and syringes after use.Needles and syringes may be cleaned but reused for some injections.Needles and syringes reused between animals.
Instruments-tattoo, hoof trim, dehorn, surgeryThrough sanitization or sterilization between animals. Electric dehorners.Instruments sanitized between animals. Gouge dehorners.Minimal or no sanitation between animals. Gouge dehorners.
Common rectal sleevesSleeves changed between each animal.Sleeves changed only if obvious blood.Sleeves used between animals regardless of blood.
Biting insectsGood external parasite control. Calves raised away from cows.Some external parasite control. Calves same farm but ~50 yards from cows.Poor external parasite control. Calves near adult cattle.