How reliable is your BVD test?
Not all BVD test methods will pick up 100% of PIs with the risk of infection from undetected PIs remaining in the herd.
New Zealand trial data following a study by LIC (Livestock Improvement Corporation) found that some PIs may remain undetectable by the BVD Antigen ELISA test for extended periods after colostrum intake. In comparison PCR (Polymerase Chain Reaction) testing resulted in 100% detection of PIs.
The recommendation of New Zealand BVD Steering Committee is that calves must be over 35 days old for BVD Antigen ELISA analysis. Under current UK Cattle Legislation all calves must be tagged within 20 days of birth.
George Caldow, Veterinary Manager at SAC (Scottish Agricultural College)
“Our recommendation is that calves should be tagged as soon after birth as can be managed. Tissue samples can be held and posted in batches every two weeks. Our laboratory will return the results from the test within five days minimising the time for potential infection of other animals in the herd.”