Bovine Viral diarrhea (BVD) is an important viral disease in cows all over the world. This virus is one of the flaviviridae family viruses and pestivirus species which causes several syndromes. BVD virus (BVDV) Is recognized as important causes of bovine abortion and congenital disease worldwide. In this study, serological investigations were performed using the ELISA method on 176 serum samples to estimate the prevalence of BVDV infection in Sarabian & Holstein dairy cows, to assess to what extent it may affect abortion rates in two herds. The overall BVDV seroprevalence in Sarabian dairy cows was estimated at 30% (25/84), and in Holstein, seroprevalence was 52% (48/92). There was a statistically significant (P = 0.04) association between presence of antibodies to BVDV in two herds. Among aborting cows from herds, Sarabian herd 37% (11/30) had antibodies and Holstein herd 44% (20/45) had antibodies to BVDV. Therefore, we did not find a significant association between percentage of abortion in seropositive Sarabian and Holstein dairy cows (p = 0.176). The results confirmed that although Sarabian breed is more resistant to BVDV than Holstein, number of seropositive aborted cows were approximately similar in two herds.
