Prevalence of antibodies to IBR and BVD viruses in dairy cows with reproductive disorders

We determined the prevalence of antibodies to infectious bovine rhinotrache itis virus (IBRV) and bovine viral diarrhea virus (BVDV) in sera of dairy c ows on 4 different farms in the Republic of Croatia. A high percentage (60. 8%) of cows had various reproductive disorders. The results showed that ser oprevalence of infectious bovine rhinotracheitis (IBR) was 85.8% and that o f bovine viral diarrhea (BVD) was 79.2% in tested cows. Antibodies to both viruses were found in 80.8% of cows with reproductive disorders but in only 46.8% of cows without reproductive disorders. This difference was statisti cally significant (P<0.01), and indicated a connection between reproductive disorders and simultaneous infections with IBR and BVD viruses in dairy co ws. (C) 1999 by Elsevier Science Inc.