| economic effects of exposure to bovine viral diarrhea virus on dairy herds in new zealand. | the economic loss to dairy farmers associated with bovine viral diarrhea virus (bvdv) is believed to be high in new zealand, but no estimates are yet available. the aim was therefore to estimate the economic loss associated with bvdv in dairy herds in new zealand. bulk tank milk (btm) from a random sample of 590 herds from the northland, bay of plenty, and waikato regions was tested for antibody against bvdv. the inhibition percentage (sample to positive ratio), based on a threshold validated in ... | 2007 | 18024733 |