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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">vetpress</journal-id><journal-title-group><journal-title xml:lang="ru">Аграрная наука</journal-title><trans-title-group xml:lang="en"><trans-title>Agrarian science</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0869-8155</issn><issn pub-type="epub">2686-701X</issn><publisher><publisher-name>Редакция журнала "Аграрная наука"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32634/0869-8155-2023-369-4-75-79</article-id><article-id custom-type="elpub" pub-id-type="custom">vetpress-2581</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>ЗООТЕХНИЯ И ВЕТЕРИНАРИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ZOOTECHNICS AND VETERINARY MEDICINE</subject></subj-group></article-categories><title-group><article-title>Применение сексированного семени быков-производителей в племенных хозяйствах Калужской области</article-title><trans-title-group xml:lang="en"><trans-title>Application of sexed semen of sires in breeding farms of Kaluga region</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1080-4398</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Санова</surname><given-names>З. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Sanova</surname><given-names>Z. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Зоя Сергеевна Санова, кандидат сельскохозяйственных наук,</p><p>ул.  Центральная, 2, пос. Калужская опытная сельскохозяйственная станция, Калужская область, 249142</p></bio><bio xml:lang="en"><p>Zoya Sergeevna Sanova, Candidate of Agricultural Sciences</p><p>2 Tsentralnaya str., Kaluga Experimental Agricultural Station, Kaluga region, 249142</p></bio><email xlink:type="simple">sanova.zoya@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/0000-0003-3427-0116</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мазуров</surname><given-names>В. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Mazurov</surname><given-names>V. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Владимир Николаевич Мазуров, кандидат сельскохозяйственных наук</p><p>ул.  Центральная, 2, пос. Калужская опытная сельскохозяйственная станция, Калужская область, 249142</p></bio><bio xml:lang="en"><p>Vladimir Nikolaevich Mazurov, Candidate of Agricultural Sciences</p><p>2 Tsentralnaya str., Kaluga Experimental Agricultural Station, Kaluga region, 249142</p></bio><email xlink:type="simple">mazurov@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Калужский научно-исследовательский институт сельского хозяйства — филиал федерального государственного бюджетного научного учреждения «Федеральный исследовательский центр картофеля им. А.Г. Лорха»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kaluga Research Agriculture Institute Branch of Russian Potato Research Center named after A.G. Lorch</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>10</day><month>05</month><year>2023</year></pub-date><volume>0</volume><issue>4</issue><fpage>75</fpage><lpage>79</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Санова З.С., Мазуров В.Н., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Санова З.С., Мазуров В.Н.</copyright-holder><copyright-holder xml:lang="en">Sanova Z.S., Mazurov V.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://www.vetpress.ru/jour/article/view/2581">https://www.vetpress.ru/jour/article/view/2581</self-uri><abstract><sec><title>Актуальность</title><p>Актуальность. Главным направлением в совершенствовании молочных пород скота является изыскание путей и методов создания высокопродуктивных стад. Однако успешное решение невозможно без использования современных методов и технологий. Среди них — сексированная сперма (разделенная на Xи Y-содержащие сперматозоиды). При использовании сексированной спермы в молочном скотоводстве можно регулировать получение желаемого пола (телочек). Эффективное применение сексированного семени обеспечит хозяйствам комплектацию собственным маточным поголовьем и позволит проводить продажу телок.</p></sec><sec><title>Методы</title><p>Методы. Объект исследований — коровы, осемененные сексированной спермой быков-производителей разных пород (джерсейской, Swedish Red, красной датской) в племенном репродукторе. Изучены оплодотворяемость маточного поголовья, продолжительность стельности, влияние сезона на оплодотворяемость, анализ выхода телочек в приплоде. Для анализа использовались данные из базы для регистрации зоотехнических и племенных данных «СЕЛЭКС».</p></sec><sec><title>Результаты</title><p>Результаты. Установлено что оплодотворяемость телок от первого осеменения сексированной спермой была 38,8%, в последующем она снижалась и составила при втором осеменении 27,7%, при третьем — 5,5%. Бесплодными остались 28%, стельными — 72% телок от общего количества. Получено 85% живых телочек и 15% бычков. При первичном осеменении коров первого отела сексированной спермой стали стельными 27,7%, при повторном — 27,7%, бесплодными остались 39,1%. Лучшие результаты оплодотворяемости маточного поголовья с использованием сексированного семени получены при первичном осеменении телок.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Relevance</title><p>Relevance. The main direction in the improvement of dairy cattle breeds is the search for ways and methods of creating highly productive herds. However, the successful solution of these issues is impossible without the use of modern methods and technologies. Among them, sexed sperm is a sperm divided into Xand Y-containing spermatozoa. When using sexed sperm in dairy cattle breeding, it is possible to regulate the receipt of the desired sex (heifers). The effective use of sexed semen will provide farms with a complete set of their own breeding stock and will allow the sale of heifers.</p></sec><sec><title>Methods</title><p>Methods. The object of research was cows inseminated with sexed sperm of stud bulls of different breeds in a breeding unit. The fertilization of the breeding stock, the duration of pregnancy, the effect of the season on fertilization, analytic investigation of calf crop percent were investigated. For analysis the data were used from the database for zootechnical and pedigree data registration «SELEKS».</p><p>Results It was found that the fertilization of heifers from the first insemination with sexed sperm was 38,8%, subsequently it decreased and amounted to 27,7% at the second insemination, 5,5% at the third. 28% remained infertile, 72% of heifers from the total remained pregnant. 85% of live heifers and 15% of bulls were obtained. During the initial insemination of cows of the first calving with sexed sperm, 27,7% of cows became pregnant, with repeated insemination — 27,7%. Fertilization decreased, 39,1% of the animals remained infertile. The best results of fertilization of breeding stock using sexed semen were obtained during the primary insemination of heifers</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>животные</kwd><kwd>сексированная сперма</kwd><kwd>быки</kwd><kwd>телята</kwd><kwd>оплодотворяющая способность</kwd><kwd>стельность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>animals</kwd><kwd>sexed sperm</kwd><kwd>bulls</kwd><kwd>calves</kwd><kwd>fertilizing ability</kwd><kwd>pregnancy</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Материалы подготовлены в рамках научно-технической программы FZWE-2019-0011 «Разработать адаптивные, экономически обоснованные технологии производства продукции растениеводства и животноводства на основе селекции сельскохозяйственных культур, совершенствования племенной работы и современных агротехнологий»</funding-statement><funding-statement xml:lang="en">The materials were prepared as part of the scientific and technical program FZWE-2019-0011 «To develop adaptive, economically sound technologies for the production of crop and livestock products based on the selection of agricultural crops, improvement of breeding work and modern agricultural technologies»</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">Harlap S.Yu., Gorelik A.S., Bitkeeva M.A., Demina N.A., Mullagulova G.M. 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