UDC 619: 616.9: 636.088: 636.4
DOI: 10.26155/vet.zoo.bio.202002008

Authors

S. V. Fedotov
Doctor of Veterinary Sciences, Professor of the Department of Diagnostics of Diseases, Therapy, Obstetrics and Animal Reproduction, Moscow State Academy of Veterinary Medicine and Biotechnology - MBA named after K. I. Skryabin,
V.S. Avdeenko
Doctor of Veterinary Sciences, Professor, Department of Animal Diseases and EVE, Saratov State Agrarian University named after N. I. Vavilov,
N.V. Lebedev
Candidate of Veterinary Sciences, Head of the Department for the Analysis of Equivalence Principles in the Export of Animals and Livestock Products, All-Russian State Center for the Quality and Standardization of Medicines for Animals and Feed

Abstract

After recovering from the respiratory reproductive syndrome, most of the sows are immune to reinfection. Antibodies to PRRS virus detected by enzyme-linked immunosorbent assay can persist for a year.
The PRRS virus causes damage to the reproductive system of pigs, which can occur in the form of miscarriages, the birth of non-viable piglets and infertility in sows. In order to establish changes in the fetoplacental system in pregnant sows who had had a respiratory-reproductive syndrome, we performed morphometric studies of the reproductive organs of pregnant sick pigs.
A morphological study of the fetal part of the placenta indicates that the placenta mass in sows with PRRS was significantly lower compared with the placenta mass of clinically healthy sows: 0,71 ± 0,05 kg versus 0,92 ± 0,09 kg at the end the second trimester and 1,61 ± 0,42 against 1,75 ± 0,16 kg on 105–110 days of pregnancy.
We observed a significant decrease in fetal body weight in seropositive pigs compared with clinically healthy pigs by 70–75 days of gestation by 31,8%, and by 105–110 days - by 19,2%. In newborn piglets obtained from experimental sows, physiological abnormalities were noted, which made it possible to diagnose hypotrophy.

Keywords

respiratory reproductive syndrome, pigs, morphometric studies, placenta, umbilical cord, newborn piglets.