The aim of this study was to determinate incidence along with possible changes in clinical, heamtological and blood biochemical parameters in cattle naturally infected with infectious bovine rhinotracheitis (IBR). A total of 296 cattle obtained from 21 different farms, vaccinated and unvaccinated against BVDV, aged from 1 months to 8 age, were evaluated. After virological determinations, animals divided into three groups created as: while 38 animals of 296 vaccinated against IBR was composed to the first group and named Vaccinated and shown antibody (+), the second group was included 25 animals which no vaccinated against IBR, but shown antibody (+) and remaining 232 animals appointed as unvaccinated and shown no-antibody (-) against ...