Galvijų virusinės diarėjos ir galvijų infekcinio rinotracheito diagnostiniai ir epidemiologiniai tyrimai pieninių galvijų bandose ; Bovine viral diarrhoea and bovine infectious rhinotracheitis diagnostics and epidemiological analysis in dairy cattle herds

The aim of this work was to carry out diagnostical and epidemiological analysis of bovine viral diarrhoea and infectious rhinotracheitis in Lithuanian dairy cattle herds. The work has 39 pages, including 3 tables, 12 images and 101 literature source. Analysis was carried out in year 2015 at Lithuanian University of Health Sciences, Veterinary Academy, Department of Veterinary Pathobiology and National Food and Veterinary Risk Assessment Institute’s Virological research laboratory. The analysis of 1857 blood serum samples were made from 30 farms taken. 905 of samples were taken for detection of IBR, 517 samples for detection of BVD antibodies and 435 samples for detection BVD antigens. There was also a retrospective analysis carried out of data taken from years 2004 to 2014 from chosen farm X in NFVRAI’s Virological research laboratory. 192 blood serum samples were analysed for BVD and IBR. In addition an analysis was made of 40 blood serum samples taken from farm X in year 2015. An ELISA method was used for assay of all aforementioned blood serum samples. Of 30 farms 19 (63.3%) had cattle positive to BoHV-1, and BVD seropositive cattle were detected in 16 (53.3%) of these herds. The average level of IBR seropositivity was 20.7%, and 43,4% of cattle were seropositive for BVD virus. Most of the seropositive cattle were in 6 – 12 months age group. Also in the same group there were most of persistently infected cattle (1.54%). IBR serological analysis in farm X showed that in period of 5 months 40% of susceptible animals can get infected. Vaccination programme in farm X significantly reduced IBR and BVD morbidity.