A total of 200 samples were collected from the calves for different ages from local and exotic breed by using nasal swabs, to investigate the prevalence of the bovine adenoviruses. The results showed that about 44% of the examined calves gave positive to immunofluorescence test, and the calves aged 6-9 months showed highly significant prevalence compare with other ages. The prevalence of virus infection in the exotic breed was 50.3% compared with local breed 22.2%. The calves with respiratory affections showed a higher prevalence from those which seem to be healthy. The current study concluded that the bovine adenovirus-type 3-virus has an effect on the breeding of calves in Nineveh Governorate.