Infectious bovine rhinotracheitis is a highly contagious respiratory disease caused by the bovine herpesvirus type 1 (BHV-1). This disease causes vast economic losses in cattle breeding, namely in dairy cattle breeds and consequently in the dairy industry. The aim of the thesis was to evaluate the process of the National IBR eradication program since its beginning to the present day. I have collected data mapping the course of five years of the NEP IBR. In the second part of the thesis I have examined six farms in the Český Krumlov region and another six farms in the Tábor region. Then I compared these two regions and evaluated the results.

Bovine viral diarrhea (BVD) is an economically important disease of cattle. Calves persistently infected (PI) with the bovine viral diarrhea virus (BVDV) are a powerful agent for spread of the virus. A total of 24,423 southeast origin beef cattle comingled at three Warren County, Kentucky locations were tested from November 2007 to June 2010 for PI BVDV. A total of 97 head tested positive for PI BVDV, giving an average overall prevalence of 0.397%. Calves tested were subdivided into categories for additional calculations of dependence. A total of 8,910 were categorized by weight range upon testing (300-399 lbs, 400-499 lbs, 500-599 lbs, and 600-699 lbs). Prevalence does show a dependence on weight, with a higher prevalence found in lower weight classes, especially 300-399 lb calves (P<0.001). A total of 24,423 were categorized by season at time of testing (Fall, Winter, Spring, Summer). Prevalence does not show a dependence on season (P>0.05). Although eradication programs are not likely to be organized in the United States, several control programs have been developed. These findings can be used as additional support for PI testing of calves, especially those in lighter weight classes, as part of a BVD control program.