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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">vestiag</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия аграрных наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Agrarian Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1817-7204</issn><issn pub-type="epub">1817-7239</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1817-7204-2024-62-1-45-56</article-id><article-id custom-type="elpub" pub-id-type="custom">vestiag-739</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>ЖЫВЁЛАГАДОЎЛЯ І ВЕТЭРЫНАРНАЯ МЕДЫЦЫНА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ANIMAL HUSBANDRY AND VETERINARY MEDICINE</subject></subj-group></article-categories><title-group><article-title>Способы искусственного регулирования полового цикла маточного поголовья абердин-ангусской породы</article-title><trans-title-group xml:lang="en"><trans-title>Methods of artificial regulation of estrous cycle of Aberdeen Angus breeding stock</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6522-6228</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гуминская</surname><given-names>Е. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Guminskaya</surname><given-names>E. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гуминская Елена Юрьевна – кандидат сельскохозяйственных наук, доцент, ведущий научный сотрудник лаборатории разведения и селекции мясного скота</p><p>ул. Фрунзе, 11, 222163, Жодино, Минская обл., Республика Беларусь</p></bio><bio xml:lang="en"><p>Elena Yu. Guminskaya – Ph. D. (Agriculture), Associate Professor, Leading Researcher of the Laboratory for Beef Cattle Breeding and Selection</p><p>11, Frunze Str., 222163, Zhodino, Minsk Region, Republic of Belarus</p></bio><email xlink:type="simple">elena.huminskaya@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сидунов</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sidunov</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сидунов Сергей Владимирович – кандидат сельскохозяйственных наук, доцент, заведующий лабораторией разведения и селекции мясного скота</p><p>ул. Фрунзе, 11, 222163, Жодино, Минская обл., Республика Беларусь</p></bio><bio xml:lang="en"><p>Serhey V. Sidunov – Ph. D. (Agriculture), Associate Professor, Head of the Laboratory for Beef Cattle Breeding and Selection</p><p>11, Frunze Str., 222163, Zhodino, Minsk Region, Republic of Belarus</p></bio><email xlink:type="simple">boks12@tut.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лобан</surname><given-names>Р. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Loban</surname><given-names>R. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лобан Раиса Владимировна – кандидат сельскохозяйственных наук, ведущий научный сотрудник лаборатории разведения и селекции мясного скота</p><p>ул. Фрунзе, 11, 222163, Жодино, Минская обл., Республика Беларусь</p></bio><bio xml:lang="en"><p>Raisa V. Loban – Ph. D. (Agriculture), Leading Researcher of the Laboratory for Beef Cattle Breeding and Selection</p><p>11, Frunze Str., 222163, Zhodino, Minsk Region, Republic of Belarus</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>Сидунова</surname><given-names>М. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Sidunova</surname><given-names>M. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сидунова Мария Николаевна – научный сотрудник лаборатории разведения и селекции мясного скота</p><p>ул. Фрунзе, 11, 222163, Жодино, Минская обл., Республика Беларусь</p></bio><bio xml:lang="en"><p>Maria N. Sidunova – Researcher of the Laboratory for Beef Cattle Breeding and Selection</p><p>11, Frunze Str., 222163, Zhodino, Minsk Region, Republic of Belarus</p></bio><email xlink:type="simple">marinanik2610@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Научно-практический центр Национальной академии наук Беларуси по животноводству</institution></aff><aff xml:lang="en"><institution>Scientific and Practical Center of the National Academy of Sciences of Belarus for Animal Breeding</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>10</day><month>02</month><year>2024</year></pub-date><volume>62</volume><issue>1</issue><fpage>45</fpage><lpage>56</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Гуминская Е.Ю., Сидунов С.В., Лобан Р.В., Сидунова М.Н., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Гуминская Е.Ю., Сидунов С.В., Лобан Р.В., Сидунова М.Н.</copyright-holder><copyright-holder xml:lang="en">Guminskaya E.Y., Sidunov S.V., Loban R.V., Sidunova M.N.</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://vestiagr.belnauka.by/jour/article/view/739">https://vestiagr.belnauka.by/jour/article/view/739</self-uri><abstract><p>Исследование направлено на изучение эффективности использования схем OvSynch и Co-Synch с последующей ресинхронизацией на мясных коровах и телках абердин-ангусской породы. В качестве факторов, определяющих воспроизводительную функцию, выбраны гормональный статус животных и биохимические показатели сыворотки крови. Цель – изучить результативность применения протоколов синхронизации OvSynch и Co-Synch на коровах и телках абердин-ангусской породы в зависимости от гормонального статуса осеменяемых животных и биохимических показателей сыворотки крови. Установлено, что оплодотворяемость лучше у коров при осеменении по протоколу OvSynch на 5,0–8,5 % на первом этапе и на 5,5 % на втором этапе осеменения. В группе телок наилучшие результаты оплодотворяемости получены при применении протокола Co-Synch (59,3 %). Введение коровам второй инъекции ГнРГ на 9-й день протокола OvSynch, за 16 ч до осеменения, привело к оплодотворяемости в среднем 52,3 %, что на 3,4 % больше по сравнению с 14-часовым интервалом между инъекцией ГнРГ и осеменением. Концентрация стероидных и гонадотропных гормонов кортизола, эстрадиола, ФСГ и ЛГ у подопытных животных во время осеменения соответствовала фазе эструс. Результаты биохимического исследования крови указывают на ряд метаболических несоответствий в организме животных. Изменение биохимических показателей сыворотки крови у животных, не ставших стельными, подчинялось тем же закономерностям, что и у ставших стельными. Однако уровень превышения либо снижения показателей проявлялся слабее. Полученные результаты могут быть использованы при организации искусственного осеменения в племенных и товарных сельскохозяйственных организациях, занимающихся разведением мясного скота, а также при преподавании дисциплин зоотехнического и ветеринарного профиля в сельскохозяйственных высших учебных заведениях.</p></abstract><trans-abstract xml:lang="en"><p>The research aim is to study the efficiency of using the OvSynch and Co-Synch schemes with subsequent resynchronization on beef cows and heifers of the Aberdeen Angus breed. The hormonal state of animals and the biochemical blood serum parameters were chosen as factors determining reproductive function. The purpose is to study the efficiency of applying the OvSynch and Co-Synch synchronization protocols on cows and heifers of the Aberdeen Angus breed depending on the hormonal state of the inseminated animals and the biochemical blood serum parameters. The rate of fertilization in cows inseminated according to the OvSynch protocol was determined to be 5.0 to 8.5 % higher during the first stage of insemination and 5.5 % higher during the second stage of insemination. In the group of heifers, the best fertilization results were obtained while using the Co-Synch protocol (59.3 %). Giving cows a second injection of GnRH, on day 9 of the OvSynch protocol, 16 hours before insemination, provided an average rate of fertilization of 52.3 %, which is 3.4 % higher compared to the 14-hour interval between GnRH injection and insemination. The concentration of steroid and gonadotropic hormones, including cortisol, estradiol, FSH and LH, in experimental animals during insemination corresponded to the estrus phase. The results of biochemical blood tests indicate a number of metabolic inconsistencies in the animal body. Changes in the biochemical blood serum parameters in animals that did not become pregnant followed the same patterns as in those that became pregnant. However, the level of increase or decrease in parameters was less pronounced. The results obtained can be used in arranging artificial insemination in breeding and commercial agricultural organizations engaged in beef cattle breeding, as well as in teaching process of zootechnical and veterinary disciplines in agricultural higher educational institutions of the Republic of Belarus.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>синхронизация</kwd><kwd>половая охота</kwd><kwd>искусственное осеменение</kwd><kwd>гормоны</kwd><kwd>биохимические показатели сыворотки крови</kwd><kwd>упитанность</kwd><kwd>оплодотворяемость</kwd><kwd>ресинхронизация</kwd></kwd-group><kwd-group xml:lang="en"><kwd>synchronization</kwd><kwd>estrus</kwd><kwd>artificial insemination</kwd><kwd>hormones</kwd><kwd>biochemical blood serum parameters</kwd><kwd>fleshing index</kwd><kwd>fertilization rate</kwd><kwd>resynchronization</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Malinova, R. 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