Authors:
E. N. SHILOVA, doctor of veterinary sciences, associate professor, senior researcher,
M. V. RIAPOSOVA, doctor of veterinary sciences, associate professor, leading researcher,
O. V. SOKOLOVA, candidate of biological sciences, senior researcher,
Ural Federal Agrarian Research Center of the Ural Branch of the Russian Academy of Sciences (112a Belinskogo Str., 620142, Ekaterinburg).
Abstract. Infectious bovine rhinotracheitis (IBR) is a significant problem for dairy cattle. Live and inactivated vaccines against acute respiratory viral infections, including IBR, are used in the breeding enterprises of the Ural region. Methods of serological screening of antibodies using common serological diagnostic tests do not allow to estimate the origin of antibodies to the causative agent of IBR (vaccine or field strain of the virus). The solution to differentiating field and vaccine strains was the possibility of using modified monovaccines against IBR. The purpose of this study was to assess the effect of vaccination against infectious bovine rhinotracheitis with a labeled vaccine on bovine reproduction rates. The effect of labeled vaccines on cattle reproduction rates in a dairy herd with seroprevalence to a field strain (gE) of 95 % was evaluated. It has been established that with the use of labeled vaccines, the seroprevalence in the herd during the first year decreased, on average, to 53 %, during the second year after the start of vaccination, to 14 %. 5 years after vaccination, seroprevalence was at the level of 5%. Simultane-ously, reproduction rates were evaluated. It was found that with the introduction of vaccination against infectious rhinotrache- itis, the service period for cows was reduced by 13% (from 130 to 115 days), the number of afterbirth delays by 46 % (from 21.9 to 15%), the number of stillbirths – by 12, 5% (from 2.7 to 2.4 %). The use of monovaccines for the specific prevention of IBR makes it possible to control the appearance of infectious vulvovaginitis in cows and heifers in dysfunctional infectious rhinotracheitis in cattle dairy farms. The use of a labeled vaccine makes it possible to evaluate the effectiveness of the prophy-laxis being carried out and to monitor it at all stages of the rehabilitation of farms.
Keywords: infectious bovine rhinotracheitis, IBR, marker vaccinаtion, antigens gE and gВ, ELISA, reproduction.
