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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">izvestiiatimacad</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Тимирязевской сельскохозяйственной академии</journal-title><trans-title-group xml:lang="en"><trans-title>IZVESTIYA OF TIMIRYAZEV AGRICULTURAL ACADEMY</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-342X</issn><publisher><publisher-name>ФГБОУ ВО РГАУ-МСХА имени К.А. Тимирязева</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26897/0021-342X-2024-3-146-153</article-id><article-id custom-type="elpub" pub-id-type="custom">izvestiiatimacad-669</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, БИОЛОГИЯ И ВЕТЕРИНАРНАЯ МЕДИЦИНА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>LIVESTOCK BREEDING, BIOLOGY AND VETERINARY MEDICINE</subject></subj-group></article-categories><title-group><article-title>Влияние генотипа бычков на потребление и использование питательных веществ кормов рациона</article-title><trans-title-group xml:lang="en"><trans-title>Effect of the genotype of bull calves on the consumption and use of nutrients in the diet</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Юлдашбаев</surname><given-names>Ю. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Yuldashbayev</surname><given-names>Yu. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юлдашбаев Юсупжан Артыкович, профессор кафедры частной зоотехнии, д-р с.-х. наук, профессор, академик РАН</p><p>127550, г. Москва, ул. Тимирязева, 49</p><p>тел.: (905) 551–72–41</p></bio><bio xml:lang="en"><p>Yusupzhan A. Yuldashbaev, DSc (Agr), Professor, Professor at the Department of Private Animal Science, Member of the Russian Academy of Sciences</p><p>49 Timiryazevskaya St., Moscow, 127550</p><p>phone: (905) 551–72–41</p></bio><email xlink:type="simple">zoo@rgai-msha.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>Косилов</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Kosilov</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Косилов Владимир Иванович, профессор кафедры технологии производства и переработки продукции животноводства, д-р с.-х. наук, профессор</p><p>460014, г. Оренбург, ул. Челюскинцев, 18</p><p>тел.: (919) 840–23–01</p></bio><bio xml:lang="en"><p>Vladimir I. Kosilov, DSc (Agr), Professor, Professor at the Department of Technology of Production and Processing of Livestock Products</p><p>18 Chelyuskintsev St., Orenburg, 460014</p><p>phone: (919) 840–23–01</p></bio><email xlink:type="simple">kosilov_vi@bk.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Жаймышева</surname><given-names>С. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhaymysheva</surname><given-names>S. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Жаймышева Сауле Серекпаевна, доцент кафедры технологии производства и переработки продукции животноводства, д-р с.-х. наук, доцент</p><p>460014, г. Оренбург, ул. Челюскинцев, 18</p><p>тел.: (922) 538–99–27</p></bio><bio xml:lang="en"><p>Saule S. Zhaymysheva, DSc (Agr), Associate Professor, Associate Professor at the Department of Technology of Production and Processing of Livestock Products</p><p>18 Chelyuskintsev St., Orenburg, 460014</p><p>phone.: (922) 538–99–27</p></bio><email xlink:type="simple">saule-zh@bk.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рахимжанова</surname><given-names>И. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Rakhimzhanova</surname><given-names>I. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рахимжанова Ильмира Агзамовна, заведующий кафедрой электротехнологии и электрооборудования, д-р с.-х. наук, доцент</p><p>460014, г. Оренбург, ул. Челюскинцев, 18</p><p>тел.: (950) 187–81–52</p></bio><bio xml:lang="en"><p>Ilmira A. Rakhimzhanova, DSc (Agr), Associate Professor, Head of the Department of Electrical Engineering and Electrical Equipment</p><p>18 Chelyuskintsev St., Orenburg, 460014</p><p>phone.: + (950) 187–81–52</p></bio><email xlink:type="simple">kaf36@orensau.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Седых</surname><given-names>Т. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sedykh</surname><given-names>T. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Седых Татьяна Александрова, заместитель директора по научной работе, д-р биол. наук, доцент</p><p>450059, г. Уфа, ул. Рихарда Зорге, 19</p><p>тел.: (917) 778–72–75</p></bio><bio xml:lang="en"><p>Tatyana A. Sedykh, DSc (Bio), Associate Professor, Deputy Director for Scientific Work</p><p>19, Rikharda Zorge St., Ufa, 450059</p><p>phone.: (917) 778–72–75</p></bio><email xlink:type="simple">kaf36@orensau.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Российский государственный аграрный университет – МСХА имени К.А. Тимирязева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Russian State Agrarian University – Moscow Timiryazev Agricultural Academy</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Оренбургский государственный аграрный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Orenburg State Agrarian University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Башкирский научно-исследовательский институт сельского хозяйства УФИЦ РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Bashkir Scientific Research Institute of Agriculture of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>24</day><month>05</month><year>2024</year></pub-date><volume>1</volume><issue>3</issue><fpage>146</fpage><lpage>153</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Юлдашбаев Ю.А., Косилов В.И., Жаймышева С.С., Рахимжанова И.А., Седых Т.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Юлдашбаев Ю.А., Косилов В.И., Жаймышева С.С., Рахимжанова И.А., Седых Т.А.</copyright-holder><copyright-holder xml:lang="en">Yuldashbayev Y.A., Kosilov V.I., Zhaymysheva S.S., Rakhimzhanova I.A., Sedykh T.A.</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://izvestiia.timacad.ru/jour/article/view/669">https://izvestiia.timacad.ru/jour/article/view/669</self-uri><abstract><p>При проведении селекционно-племенной работы с животными мясного направления скотоводства необходимо выявлять и широко применять животных, отличащающихся высокими показателями использования питательных веществ кормов рациона на синтез мясной продукции. Целью исследований являлась оценка эффективности переваривания питательных веществ кормов рациона чистопородными бычками симментальской (I группа), лимузинской (II группа) пород и их помесей первого (½ симментал × ½ лимузин – III группа), второго (¼ симментал × ¾ лимузин – IV группа) и третьего (1/8 симментал × 7/8 лимузин – V группа) поколений. Установлено, что вследствие проявления эффекта гетерозиса помесные бычки первого поколения III группы превосходили сверстников других подопытных групп по потреблению сухого вещества корма на 67,8–255,3 г (0,86–3,31%), органического вещества – на 61,3–230,8 г (0,84–3,24%), сырого протеина – на 10,5–78,1 г (0,99–7,85%), сырого жира – на 1,7–6,4 г (0,90–3,50%), сырой клетчатки – на 21,5–81,4 г (1,20–4,70%), БЭВ – на 27,6–354,8 г (0,65–9,04%). Минимальным потреблением всех видов питательных веществ отличались чистопородные бычки симментальской породы I группы. Аналогичные межгрупповые различия отмечались по переваримости питательных веществ корма. Помеси III группы превосходили молодняк других подопытных групп по массе переваренного сухого вещества на 119,8–390,3 г (2,37–8,15%), органического вещества – на 130,6–396,6 г (2,87–8,71%), сырого протеина – на 22,5–98,3 г (3,24–15,90%), сырого жира – на 2,7–9,2 г (2,11–7,58%), сырой клетчатки – на 67,9–162,1 г (7,28–19,33%), БЭВ – на 37,5–417,0 г (1,26–15,54%). Наиболее высокими коэффициентами перевар мости питательных веществ отличались помесные бычки III и IV групп. Они лучше, чем сверстники I, II и V групп, переваривали: сухое вещество – на 2,91–1,73%; органическое – на 3,38–1,96%; сырой протеин – на 4,63–2,29%; сырой жир – на 2,62–0,56%; сырую клетчатку – на 6,76–1,87%; БЭВ – на 4,08–2,72%.</p></abstract><trans-abstract xml:lang="en"><p>In beef cattle breeding, it is necessary to identify and widely use animals characterized by high rates of nutrient utilization in the diet for the synthesis of meat products. The aim of the study was to evaluate the efficiency of digestion of nutrients in the diet of purebred bull calves of the breeds Simmental (group I) and Limousine (group II) and their crossbreeds of the first (½ Simmental × ½ Limousine – group III), the second (¼ Simmental × ¾ Limousine – group IV) and the third (1/8 Simmental × 7/8 Limousine – V group) generations. It was found that due to the heterosis effect, crossbred bull calves of the first generation of group III outperformed their counterparts of other experimental groups in dry matter intake by 67.8 to 255.3 g (0.86 to 3.31%), organic matter – by 61.3 to 230.8 g (0.84 to 3.24%), crude protein – by 10.5 to 78.1 g (0.99 to 7.85%), crude fat – by 1.7 to 6.4 g (0.90 to 3.50%), crude fiber – by 21.5 to 81.4 g (1.20 to 4.70%), BEV – by 27.6 to 354.8 g (0.65 to 9.04%). The purebred Simmental bull calves of group I differed in the minimum consumption of all types of nutrients. Similar intergroup differences were observed in the digestibility of feed nutrients. The crossbred bull calves of group III outperformed the bull calves of the other experimental groups by weight of digested dry matter by 119.8 to 390.3 g (2.37 to 8.15%), organic matter – 130.6 to 396.6 g (2.87 to 8.71%), crude protein – by 22.5 to 98.3 g (3.24 to 15.90%), crude fat – by 2.7 to 9.2 g (2.11 to 7.58%), crude fiber – by 67.9 to 162.1 g (7.28 to 19.33%), BEV – by 37.5 to 417.0 g (1.26 to 15.54%). The highest coefficients of digestibility of nutrients were characterized by crossbred bull calves of groups III and IV. They better digested dry matter by 2.91 to 1.73%, organic – by 3.38 to 1.96%, crude protein – by 4.63 to 2.29%, crude fat – by 2.62 to 0.56%, crude fiber – by 6.76 to 1.87%, BEV – by 4.08 to 2.72% than peers of groups I, II and V.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>овцеводство</kwd><kwd>романовская порода</kwd><kwd>помеси с эдильбаевской породой</kwd><kwd>корм</kwd><kwd>питательные вещества</kwd><kwd>потребление</kwd><kwd>переваримость</kwd></kwd-group><kwd-group xml:lang="en"><kwd>sheep breeding</kwd><kwd>Romanov breed</kwd><kwd>crossbreeds with the Edilbaev breed</kwd><kwd>feed</kwd><kwd>nutrients</kwd><kwd>consumption</kwd><kwd>digestibility</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">Бисембаев А.Т. и др. Возрастная динамика живой массы казахской белоголовой породы мясного скота // Известия ТСХА. – 2023. – Вып. 1 – С. 81–87. 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