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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">ivm</journal-id><journal-title-group><journal-title xml:lang="ru">Международный вестник ветеринарии</journal-title><trans-title-group xml:lang="en"><trans-title>International Journal of Veterinary Medicine</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2072-2419</issn><publisher><publisher-name>SpbGUVM Publishing House</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.52419/issn2072-2419.2025.2.328</article-id><article-id custom-type="elpub" pub-id-type="custom">ivm-1728</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>АКУШЕРСТВО, ГИНЕКОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>OBSTETRICS, GYNECOLOGY</subject></subj-group></article-categories><title-group><article-title>Сравнительное исследование концентрации биохимических компонентов и стероидных гормонов в фолликулярной жидкости и крови кобыл в весеннем переходном периоде и в случном сезоне</article-title><trans-title-group xml:lang="en"><trans-title>Comparative study of the concentration of biochemical components and steroid hormones in the follicular fluid and blood of mares in the spring transition period and in the breeding season</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9845-1691</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Калашников</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalashnikov</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>акад. РАН, д-р с.-х. наук, проф., научный руководитель</p></bio><bio xml:lang="en"><p>acad. RAS, Doctor of Agricultural Sciences, prof., Scientific director of the Federal State Institute </p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6960-5233</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лебедева</surname><given-names>Л. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Lebedeva</surname><given-names>L. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д-р с.-х. наук, доц., зав. лаб. физиологии</p></bio><bio xml:lang="en"><p>Doctor. Agricultural Sciences, Associate Professor, Head. Of the lab. Physiology</p></bio><email xlink:type="simple">lebedeva-L18@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3495-3478</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Солодова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Solodova</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. биол. наук, ст. науч. сотр.</p></bio><bio xml:lang="en"><p>Candidate of Biol. Sciences, scientific co-workers </p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сакаев</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sakaev</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>мл. науч. сотр.</p></bio><bio xml:lang="en"><p>ml. scientific co-workers</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бородкина</surname><given-names>Е. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Borodkina</surname><given-names>E. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. биол. наук, науч. сотр.</p></bio><bio xml:lang="en"><p>Ph.D. biol. sciences, scientific co-workers</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дубровская</surname><given-names>А. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Dubrovskaya</surname><given-names>A. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. с.-х. наук, науч. сотр.</p></bio><bio xml:lang="en"><p>Ph.D. agricultural sciences, scientific co-workers </p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБНУ «Всероссийский научно-исследовательский институт коневодства»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>The All-Russian Research Institute for Horse breeding</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>01</day><month>08</month><year>2025</year></pub-date><volume>0</volume><issue>2</issue><fpage>328</fpage><lpage>337</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Калашников В.В., Лебедева Л.Ф., Солодова Е.В., Сакаев В.А., Бородкина Е.Ю., Дубровская А.Б., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Калашников В.В., Лебедева Л.Ф., Солодова Е.В., Сакаев В.А., Бородкина Е.Ю., Дубровская А.Б.</copyright-holder><copyright-holder xml:lang="en">Kalashnikov V.V., Lebedeva L.F., Solodova E.V., Sakaev V.A., Borodkina E.Y., Dubrovskaya A.B.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vetjournal.spbguvm.ru/jour/article/view/1728">https://vetjournal.spbguvm.ru/jour/article/view/1728</self-uri><abstract><p>Фолликулярная жидкость (ФЖ) является естественной средой для созревания ооцитов и может быть использована для этих целей в условиях in vitro. Однако в связи с сезонностью размножения лошадей, часть фолликулов в весенний переходный период претерпевает лютеинизацию или регрессию, что при круглогодичном использовании кобыл в программах ВРТ может быть связано с качеством ооцитов. С целью поиска диагностических критериев отбора ФЖ для созревания in vitro и прогноза качества ооцитов кобыл проводили сравнение между биохимическим и гормональным составом ФЖ в весеннем переходом периоде (группа I, в т.ч. из нормальных (Ia) и лютинизирующихся (б) фолликулов) и ФЖ из крупных эстральных фолликулов циклирующих кобыл в случном сезоне (группа II), а также в сыворотке крови (группа III). Анализ содержания биохимических компонентов и стероидных гормонов показал отсутствие количественных различий по большинству компонентов в подгруппах Ia и Iб, за исключением общего белка (р=0,048) и аланинаминотрансферазы (АЛТ) (р=0,013). Достоверные различия в содержании сывороточного железа (р=0,019) и фосфора (р=0,005) были выявлены в ФЖ, полученной от кобыл в весенний переходный период и в сезон половой активности. Концентрация тестостерона, дигидротестостерона и прогестерона значительно (в 2-4 раза) увеличивалась в ФЖ эстральных фолликулов в случном сезоне. Сделано заключение, что критерием выбора ФЖ для созревания ооцитов in vitro могут служить концентрации прогестерона, тестостерона и дигидротестостерона, с учётом содержания фосфора и сывороточного железа. Содержание прогестерона, дигидротестостерона, тестостерона должно быть не менее 100 нмоль/л, 1000 пг/мл, и 16 нмоль/л, а фосфора и сывороточного железа в пределах 0,74-1,1 и 46,4-57,0 ммоль/л, соответственно. Использование данных параметров ФЖ в качестве критериев позволит определить целесообразность её применения для созревания ооцитов in vitro.</p></abstract><trans-abstract xml:lang="en"><p>Follicular fluid (FF) is a natural environment for oocyte maturation and can be used for these purposes in vitro. However, due to the seasonality of equine breeding, some follicles undergo luteinization or regression during the spring transition period, which can be directly related to oocyte quality in year-round use of mares in ART programs. In order to find diagnostic criteria for selecting FF for in vitro maturation and predicting the quality of mares' oocytes, a comparison was made between the biochemical and hormonal composition of FF in the spring transition period (group I, including normal (Ia) and luteinizing (Ib) follicles) and FF from large estrous follicles of cycling mares in the breeding season (group II), as well as in the blood serum (group III). Analysis of the content of biochemical components and steroid hormones in the FG showed no quantitative differences in most components in subgroups Ia and Ib, except for total protein (p=0.048) and alanine aminotransferase (ALT) (p=0.013). Significant differences in the content of serum iron (p=0.019) and phosphorus (p=0.005) were found in the FF obtained from mares in the spring transition period and in the season of sexual activity. The concentration of testosterone, dihydrotestosterone and progesterone significantly (2-4 times) increased in the FF of estrous follicles in the mating season. It was concluded that the concentrations of progesterone, testosterone and dihydrotestosterone, taking into account the content of phosphorus and serum iron, can serve as a criterion for selecting FF for oocyte maturation in vitro. The content of progesterone, dihydrotestosterone, testosterone should be at least 100 nmol/l, 1000 pg/ml, and 16 nmol/l, and phosphorus and serum iron content within 0.74-1.1 and 46.4-57.0 mmol/l, respectively. Using these parameters of follicular fluid as criteria will determine the feasibility of its use for oocyte maturation in vitro.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>сыворотка крови</kwd><kwd>фолликулярная жидкость</kwd><kwd>OPU</kwd><kwd>биохимический анализ</kwd><kwd>стероидные гормоны</kwd><kwd>качество ооцитов</kwd></kwd-group><kwd-group xml:lang="en"><kwd>blood serum</kwd><kwd>follicular fluid</kwd><kwd>OPU</kwd><kwd>biochemical analysis</kwd><kwd>steroid hormones</kwd><kwd>oocyte quality</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Материалы подготовлены в рамках конкурса Российского научного фонда 2022 года «Проведение фундаментальных научных исследований и поисковых научных исследований отдельными научными группами» (Проект № 23-16-00226).</funding-statement><funding-statement xml:lang="en">The materials were prepared within the framework of the 2022 competition of the Russian Science Foundation "Conducting fundamental scientific research and exploratory scientific research by individual scientific groups" (Project No. 23-16- 00226).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Bоgh, I.B. 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