Анотация: Bovine viral diarrhoea virus (BVDV), a pestivirus from the Flaviviridae family occurs worldwide in cattle populations and causes considerable economic losses. The purpose of this study was to detect BVDV by enzyme linked immunosorbent assay in dairy herds. From blood samples routinely received for bovine viral diarrhoea diagnosis, 400 sera samples (from 12 industrial dairy herds) were examined in an antigen capture ELISA (ACE) using a commercial kit. BVDV antigen was detected in 16 cattle out of 400 tested (4 percentage) and 8 of 12 farms (66.6 percentage) were infected with BVD virus. Our study reveals that BVDV infection is widely present in industrial dairy herds in Fars province. Further investigations are needed for detection and eradication of the BVDV infection source (calves with persistent infection) in this region