Serological monitoring of infectious rhinotracheitis and parainfluenza-3 in cattle in the Vitebsk region
Journal Title: Бюлетень "Ветеринарна біотехнологія" - Year 2018, Vol 32, Issue
Abstract
Introduction. Diseases of calves of a viral etiology with defeat of respiratory organs, occupy one of the leading places. By the level of spreading, mortality, forced slaughtering and insufficient weight gain, they prevail over other diseases. Respiratory diseases of calves cause viruses of infectious rhinotracheitis (IRT), parainfluenza-3 (PIV-3), viral diarrhea (VD), rota- and coronaviruses, parvoviruses, etc. The world and CIS countries have established a wide circulation of the viruses among healthy cattle of all age groups at the level of 80-100%. The presence of a broad carrier of the pathogen determines theirs constant and ubiquitous conservation in livestock of breeding complexes. The goal of the work was to study and analyze the distribution of IRT and PIV-3 in cattle in the farms of the Republic of Belarus. Materials and methods. The object of the research were blood sera of unvaccinated cattle against IRT and PIV-3 from 6 farms of Vitebsk region. The presence of antibodies was determined by the indirect hemagglutination test (IHAT) using erythrocyte test kit with the antigens of the IRT virus and PIV-3. The IHAT was set by a micromethod by diluting the blood serum in the Takatsy microtitrators solvent. The reaction of the tested serum was considered positive in 1:16 and higher titer. Results of research and discussion. Serologic studies of blood sera of recovered from respiratory and gastrointestinal diseases animals showed that antibodies in the diagnostic titer against IRT virus were detected in 72.9% of the examined animals, against PIV-3 – in 82.6%. The results obtained indicate that in the investigated farms the main cause of respiratory and gastrointestinal diseases of the calves was the IRT and PIV-3 viruses. The highest percentage of detected antibodies was established in August-September – 90–100%, but from November to February there was a decrease of the rate of seropositive animals from 75 to 40%. This indicates that the highest number of the respiratory and gastrointestinal diseases incidence was in March-June, and then there was decrease in the incidence from July to October. A high and high-grade immune response in the summer in affected animals was due to more favorable conditions of maintenance and full feeding of calves. Conclusions and prospects for further research. The conducted serological monitoring serves as the basis for developing a control system against IRT and PIV-3 of cattle and the targeted use of antiviral vaccines.
Authors and Affiliations
A. L. Ptashok, P. P. Krasochko, V. P. Krasochko, Serghiy Nychyk
Keywords
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- EP ID EP406143
- DOI 10.31073/vet_biotech32(2)-55
- Views 112
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