1. SUMMARY OF BVD DECISION MAKING-DAIRY BVDV detected Ear notch testing- bottom up approach?

2. SUMMARY OF BVD DECISION MAKING-BEEF BVDV detected Short cut- determine individual calf status for virus, exclude dams of non-PI calves Accurate recording of parentage critical!

3. JD-HERD LEVEL INVESTIGATION Herd screen >2yo serum, milk PositiveNegative 30 adults >3yo, clinical, ill-thrift, Milk yield, cull, purchased, imports

4. HERD LEVEL INVESTIGATION- JD POSITIVE Positive Testing Antibody Annual Blood/milk 3 monthly milk High prevalence Culling Reactor Offspring? Management Risk assessment Plan Review Added cattle Confirm FC, FPCR BTM Env NB if transmission routes effectively closed may be 4-5 years before prevalence starts to drop

5. HERD LEVEL INVESTIGATION-JD POSITIVE Positive Testing Antibody Annual Blood/milk 3 monthly milk High prevalence Culling Reactor Offspring? Management Risk assessment Plan Review Added cattle Confirm FC, FPCR BTM Env NB if transmission routes effectively closed may be 4-5 years before prevalence starts to drop

6. HERD INVESTIGATION-JD NEGATIVE Initial negative BTM Env Low prevalence Whole herd (>2yo) antibody Repeated testing, increased confidence Confidence α method, frequency, herd size Identify free herds, maintain status