Who should be tested?
Costs of a PI in your herd:
Cow-calf herd - $14-25 per cow exposed. (Larson, et al, 2002)
Feedlot - $41-93 per cow exposed. (Dr. Dan Grooms, MSU, 2016)
Dairy - $45-55 per dairy cow exposed. (Dr. Derrell Peel, OSU, 2016)
What tests are we running and why?
Pooled PCR – PCR is extremely sensitive and can detect a PI animal out of a pool of up to 24 animals. Pooling samples makes PCR the most cost effective test method. It may also detect transient BVD infections.
ELISA – ELISA is a confirmatory test on individuals in a positive pool. It is highly specific for Persistent Infections.
What’s a BVD PI?
Bovine Viral Diarrhea Virus – Persistent Infection.
A fetus which becomes infected with certain strains of BVD virus between 60-125 days in gestation will tolerate the virus as part of itself and subsequently be born with extremely high levels of virus throughout its body and shedding the BVD virus to herd mates.
Why are BVD PI's a problem?
PI calves can cause infection and immunosuppression of herd mates resulting in reduced conception rates and increased abortions in cows. It may also result in increased pneumonia and other diseases in calves, increasing mortality rates.
How to collect BVD samples: