ÓÄÊ 619:579.62
DOI 10.33861/2071-8020-2025-2-10-12
Original Empirical Research
Mironova A.A., Vasilenko V.N., Mironova L.P., Khamidullin T.Sh.
Abstract. The aim of our work is to consider the features of the reproductive function in bovine herpesvirus type 1 (BHV-1) seropositive heifers of mating age in dynamics. For this purpose, the seasonal dynamics of BHV-1 spread was studied in disadvantaged farms; the reproductive function indices in BHV-1 seronegative and BHV-1 seropositive animals were studied in a comparative aspect. In seropositive animals, in comparison with seronegative ones, the insemination index was higher by 61,5-91,7%; abortions and stillbirths occurred more often; retained placenta was recorded 14,2-23,3% more often; acute postpartum endometritis was 15,0-32,2% more often and mastitis was 16,1-28,9% more often. Seropositive mothers produced live calves 7,1-12,8% fewer than seronegative ones. The average time of first heat manifestation after calving in groups of seropositive animals was 10-33 days longer than in seronegative ones; the average time to fruitful insemination was 25-35 days longer. Staphylococcus aureus and Streptococcus pyogenes were isolated in association in all samples of uterine exudate from seronegative cows with acute postpartum purulent-catarrhal endometritis. Escherichia coli was detected in 100% of purulent-catarrhal exudate samples from seropositive first-calf heifers, which was also found in 100% of pathological material samples from aborted and stillborn fetuses, indicating a viral-bacterial association of the herpes virus IRT-PVV and the hemolytic strain of Escherichia coli.
Keywords: large horned cattle, IRT-PVV, seropositive, reproduction rates, Escherichia coli, associative course.
Author affiliation:
Vasilenko Vyacheslav N., D.Sc. in Agriculture, Corresponding Member of the Russian Academy of Sciences; senior scientific researcher of the Federal Rostov Agricultural Research Center; 0, Rostov hghw., Novocherkassk, Rostov region, 346421.
Mironova Lyudmila P., D. Sc. in Veterinary Medicine, professor of the department of therapy and propaedeutics of the Don State Agrarian University; 24, Krivoshlykova st., Persianovsky sttl., Oktyabrsky district, Rostov region, 346493; e-mail: mironova_lp@mail.ru.
Khamidullin Timur Sh., postgraduate student of the Don State Agrarian University; 24, Krivoshlykova st., Persianovsky sttl., Oktyabrsky district, Rostov region, 346493; e-mail: timur28061997@mail.ru.
Responsible for correspondence with the editorial board: Mironova Anna A., D.Sc. in Veterinary Medicine, senior scientific researcher of the Federal Rostov Agricultural Research Center; 0, Rostov hghw., Novocherkassk, Rostov region, 346421; phone: 8-903-4718275; e-mail: aa_mironova@mail.ru.
Authors’ Contribution: the manuscript was written with the input of all authors. All authors approved the final version of the manuscript.
Conflict of Interest Statement: the authors declare no conflict of interest.
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