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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">10.32634/0869-8155-2025-397-08-39-44</article-id><article-id custom-type="elpub" pub-id-type="custom">vetpress-3785</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</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ZOOTECHNICS</subject></subj-group></article-categories><title-group><article-title>Влияние протеолитических ферментов на степень усвоения питательных веществ в организме бычков</article-title><trans-title-group xml:lang="en"><trans-title>The effect of proteolytic enzymes on the degree of absorption of nutrients in the body of bull calves</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>Шейда</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sheida</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Елена Владимировна Шейда, доктор биологических наук, ведущий научный сотрудник отдела кормления сельскохозяйственных животных и технологии кормов им. С.Г. Леушина; доктор биологических наук, старший научный сотрудник </p><p>ул. 9 Января, 29, Оренбург, 460000;пр. Победы, 13, Оренбург, 460018</p></bio><bio xml:lang="en"><p>Elena Vladimirovna Sheida, Doctor of Biological Sciences, Leading Researcher at the S.G. Leushin Department of Farm Animal Feeding and Feed Technology; Doctor of Biological Sciences, Senior Researcher </p><p>29 9th January Str., Orenburg, 460000;13 Pobedy Ave., Orenburg, 460018</p></bio><email xlink:type="simple">elena-shejjda@mail.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/0000-0003-0561-7002</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кван</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kvan</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ольга Вилориевна Кван, кандидат биологических наук, старший научный сотрудник, завотделом кормления сельскохозяйственных животных и технологии кормов им. С.Г. Леушина; кандидат биологических наук, старший научный сотрудник </p><p>ул. 9 Января, 29, Оренбург, 460000;пр. Победы, 13, Оренбург, 460018</p></bio><bio xml:lang="en"><p>Olga Vilorievna Kvan, Candidate of Biological Sciences, Senior Researcher, Head. Department of Farm Animal Feeding and Feed Technology named after S.G. Leushin; Candidate of Biological Sciences, Senior Researcher, Acting Head of the Feeding Department </p><p>29 9th January Str., Orenburg, 460000;13 Pobedy Ave., Orenburg, 460018</p></bio><email xlink:type="simple">kwan111@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/0000-0003-4104-3333</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шошина</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shoshina</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Оксана Вячеславовна Шошина, кандидат биологических наук, младший научный сотрудник отдела кормления сельскохозяйственных животных и технологии кормов им. С.Г. Леушина </p><p>ул. 9 Января, 29, Оренбург, 460000</p></bio><bio xml:lang="en"><p>Oksana Vyacheslavovna Shoshina, Candidate of Biological Sciences, Junior Researcher at the S.G. Leushin Department of Farm Animal Feeding and Feed Technology </p><p>29 9th January Str., Orenburg, 460000</p></bio><email xlink:type="simple">oksana.shoshina.98@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-5920-1185</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сечнев</surname><given-names>Ю. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sechnev</surname><given-names>Yu. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юрий Андреевич Сечнев, аспирант отдела кормления сельскохозяйственных животных и технологии кормов им. С.Г. Леушина </p><p>ул. 9 Января, 29, Оренбург, 460000</p></bio><bio xml:lang="en"><p>Yuri Andreevich Sechnev, Postgraduate Student of the Department of Farm Animal Feeding and Feed Technology named after S.G. Leushin </p><p>29 9th January Str., Orenburg, 460000</p></bio><email xlink:type="simple">y.sechnev@outlook.com</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7881-2602</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Топурия</surname><given-names>Л. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Topuria</surname><given-names>L. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лариса Юрьевна Топурия, доктор биологических наук, профессор кафедры ветеринарно-санитарной экспертизы и фармакологии </p><p>ул. Челюскинцев, 18, Оренбург, 460014</p></bio><bio xml:lang="en"><p>Larisa Yurievna Topuria, Doctor of Biological Sciences, Professor of the Department of Veterinary and Sanitary Expertise and Pharmacology </p><p>18 Chelyuskintsev Str., Orenburg, 460014</p></bio><email xlink:type="simple">golaso@rambler.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Федеральный научный центр биологических систем и агротехнологий Российской академии наук;&#13;
Оренбургский государственный университет<country>Россия</country></aff><aff xml:lang="en">Federal Scientific Center of Biological Systems and Agro-technologies of the Russian Academy of Sciences;&#13;
Orenburg State University<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Федеральный научный центр биологических систем и агротехнологий Российской академии наук<country>Россия</country></aff><aff xml:lang="en">Federal Scientific Center of Biological Systems and Agro-technologies of the Russian Academy of Sciences<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru">Оренбургский государственный аграрный университет<country>Россия</country></aff><aff xml:lang="en">Orenburg State Agrarian University<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>02</day><month>09</month><year>2025</year></pub-date><volume>0</volume><issue>8</issue><fpage>39</fpage><lpage>44</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Шейда Е.В., Кван О.В., Шошина О.В., Сечнев Ю.А., Топурия Л.Ю., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Шейда Е.В., Кван О.В., Шошина О.В., Сечнев Ю.А., Топурия Л.Ю.</copyright-holder><copyright-holder xml:lang="en">Sheida E.V., Kvan O.V., Shoshina O.V., Sechnev Y.A., Topuria L.Y.</copyright-holder><license 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/3785">https://www.vetpress.ru/jour/article/view/3785</self-uri><abstract><p>Ферментные добавки получили широкое распространение в кормлении сельскохозяйственных животных по всему миру. Кормление ферментами-катализаторами часто сопровождается увеличением потребления корма, ввиду того что повышаются вкусовые качества рациона за счет сахаров, высвобождаемых при гидролизе клетчатки кормов. После попадания ферментов в желудок происходит увеличение скорости переваривания за счет гидролитической активности в рубце, отчего уменьшается заполнение кишечника, а переваримость увеличивается. Цель исследования — изучить особенности усвоения питательных веществ рациона бычками при включении в рацион фермента протеазы. Объекты исследований — бычки казахской белоголовой породы средней массой 320– 330 кг в возрасте 14–15 месяцев (количество 8 голов). Дополнение рациона бычков казахской белоголовой породы экзоферментом протеазы грибной в дозировке 50 г/гол оказало положительный эффект на механизмы обмена веществ в организме бычков. В результате чего было зафиксировано повышение переваримости питательных веществ рационов опытной группы. Повышалась усвояемость микроэлементов: Li на 2,0%, B на 0,4%, Se на 1,9%, Br на 2,7%, I на 24,6%, Zn на 1,0%; ухудшалось усвоение: Mn на 19,2%, Co на 29,8%, Ni на 0,8%, Cu на 2,8%, Mo на 4,8%, Cr на 6,8%, Fe на 1,5%. Токсические микроэлементы (Sr, Sn, Al, Cd, Hg, Pb) под воздействием протеазы грибной лучше удалялись из организма животных.</p></abstract><trans-abstract xml:lang="en"><p>Enzyme supplements are widely used in the feeding of farm animals all over the world. Feeding with enzyme catalysts is often accompanied by an increase in feed intake due to the fact that the palatability of the diet increases due to the sugars released during the hydrolysis of feed fiber. After the enzymes enter the stomach, the rate of digestion increases due to the hydrolytic activity in the rumen, which reduces intestinal filling and increases digestibility. The aim of the study was to study the features of the absorption of nutrients in the diet of bull calves when the protease enzyme is included in the diet. The objects of research are Kazakh white-headed bulls an average weight of 320–330 kg at the age of 14–15 months (number of 8 heads). Supplementing the diet of Kazakh whiteheaded bull calves with a mushroom protease exoenzyme at a dosage of 50 g/head had a positive effect on the metabolic mechanisms in the bull calves. As a result, an increase in the digestibility of nutrients in the diets of the experimental group was recorded. The digestibility of trace elements increased: Li by 2.0%, B by 0.4%, Se by 1.9%, Br by 2.7%, I by 24.6%, Zn by 1.0%; assimilation worsened: Mn by 19.2%, Co by 29.8%, Ni by 0.8%, Cu by 2.8%, Mo by 4.8 %, Cr by 6.8%, Fe by 1.5%. Toxic trace elements (Sr, Sn, Al, Cd, Hg, Pb) were better removed from the animal body under the influence of fungal protease.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>бычки</kwd><kwd>рацион</kwd><kwd>протеаза</kwd><kwd>усвоение</kwd><kwd>макроэлементы</kwd><kwd>микроэлементы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>kazakh white-headed bulls</kwd><kwd>diet</kwd><kwd>protease</kwd><kwd>assimilation</kwd><kwd>macronutrients</kwd><kwd>trace elements</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Исследование выполнено за счет средства гранта Российского научного фонда № 23-16-00061.</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>The research was carried out at the expense of the grant of the Russian Science Foundation No. 23-16-00061.</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">Ветвицкая А. 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