SPREAD OF VIRAL DISEASES OF PIGS IN FARMS OF THE KRASNOYARSK REGION

The objective of the study is to investigate the epizootic situation in pig farms of the Krasnoyarsk Region for viral diseases of pigs PVS, PRRS, and CDVS. The object of the study was pigs of different breeds and age and sex groups. The analysis was carried out for the years 2011–2020, the period including the most intense epizootic situation for these viral diseases of pigs in farms of the region. As a result of the studies, seropositivity was established, which amounted to: PVS – 67.8 %; PRRS – 57.3; CDVS – 48.8 %, which confirms the circulation of viruses in pig farms in the Krasnoyarsk Region. Detection of virus genomes by PCR on average over five years was: PVS – 25.6 %; PRRS – 14.9; CDV-2 – 59.9 %, and in 2016, respectively, 8.3 %; 6.5; 56.9 %, which showed an improvement in the epizootic situation for PVBS and PRRS due to the timely identification of problem farms and the implementation of a full range of necessary measures to combat diseases, including vaccination of pigs over a number of years. Thus, the course of pig diseases in a monovariant according to the PCR results was: PCV-2 – in 28 %; PRRS – in 16; PVS – in 6 % of cases. Pig diseases also occurred in associations: PCV-2 + mycoplasma – in 9 %; PRRS + mycoplasma – in 9; PCV-2 + PVS – in 6; PRRS + PVS – in 4; PCV-2 + PRRS – in 4; PRRS + PCV-2 – in 3; PCV-2 + chlamydia – in 4 % of cases. The pig population was vaccinated mainly in large pig farms of the region, the vaccination level in 2019-2020 was: PVIS – 34.6–25.0 %; PRRS – 21.2–22.6; CPVD – 61.7–78.2 %, which corresponded to the epizootic situation in this period.