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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">ilvm</journal-id><journal-title-group><journal-title xml:lang="ru">Нормативно-правовое регулирование в ветеринарии</journal-title><trans-title-group xml:lang="en"><trans-title>Legal regulation in veterinary medicine</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2782-6252</issn><publisher><publisher-name>SpbGUVM Publishing House</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.52419/issn2782-6252.2023.3.125</article-id><article-id custom-type="elpub" pub-id-type="custom">ilvm-642</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>ФАРМАКОЛОГИЯ, ТОКСИКОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHARMACOLOGY, TOXICOLOGY</subject></subj-group></article-categories><title-group><article-title>Сравнительный анализ прироста массы тела у лабораторных животных при различных путях введения L-карнитина</article-title><trans-title-group xml:lang="en"><trans-title>Comparative analysis of body weight gain in laboratory animals with different routes of administration of Lcarnitine</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>Сабирзянова</surname><given-names>Л. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Sabirzyanova</surname><given-names>L. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд.ветеринар.наук</p></bio><bio xml:lang="en"><p>PhD of Veterinary Sciences</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>Лунегов</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Lunegov</surname><given-names>A. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд.ветеринар.наук, доц.</p></bio><bio xml:lang="en"><p>PhD of Veterinary Sciences, Docent</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>Коновалова</surname><given-names>Г. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Konovalova</surname><given-names>G. V.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Токарь</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Tokar</surname><given-names>V. V.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный университет ветеринарной медицины</institution><country>Россия</country></aff><aff xml:lang="en"><institution>St. Petersburg State University of Veterinary Medicine</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Всероссийский государственный центр качества и стандартизации лекарственных средств для животных и кормов</institution><country>Россия</country></aff><aff xml:lang="en"><institution>All-Russian State Center for Quality and Standardization of Medicines for animals and feed</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>18</day><month>10</month><year>2023</year></pub-date><volume>0</volume><issue>3</issue><fpage>125</fpage><lpage>129</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Сабирзянова Л.И., Лунегов А.М., Коновалова Г.В., Токарь В.В., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Сабирзянова Л.И., Лунегов А.М., Коновалова Г.В., Токарь В.В.</copyright-holder><copyright-holder xml:lang="en">Sabirzyanova L.I., Lunegov A.M., Konovalova G.V., Tokar V.V.</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://ilvm.elpub.ru/jour/article/view/642">https://ilvm.elpub.ru/jour/article/view/642</self-uri><abstract><p>В последние годы было опубликовано несколько исследований, которые предполагают, что добавки L-карнитина могут влиять на вес у некоторых видов животных и людей, а также могут влиять на состав тела растущих животных. На данный момент доступно лишь несколько результатов о влиянии Lкарнитина на снижение веса и состав тела животных. Поэтому целью данного исследования было выяснить, могут ли инъекции L-карнитина влиять на динамику веса лабораторных животных.</p><p>Исследования токсичности были проведены на аутбредных крысах в октябре 2021 года в виварии Санкт-Петербургского государственного университета ветеринарной медицины. В исследовании участвовали самки весом 190-210 грамм, закупленные в Федеральном государственном унитарном предприятии «Питомник лабораторных животных «РАППОЛОВО».</p><p>При изучении субхронической токсичности при подкожном и внутримышечном введении, Lкарнитин вводили в 2 уровнях доз. Дозы определялись на основании результатов опыта по острой токсичности: 1/5 и 1/10 от максимальной переносимый дозы. Первая подопытная группа (n=10) получала лекарственный препарат внутримышечно в дозе 0,08мг/кг (1/5 от 2000мг/кг). Вторая подопытная группа (n=10) получала лекарственный препарат внутримышечно в дозе 0,04мг/кг (1/10 от 2000мг/кг). Третья опытная группа получала подкожно L-карнитин в дозе 0,08мг/кг (1/5 от 2000мг/кг), четвертая опытная группа получала подкожно L-карнитин в дозе 1/10 от максимальной переносимой (2000 мг/кг массы тела). Группа 5 являлась контрольной группой (n=10) и получала внутримышечно натрия хлорид 0,09% в дозе 1/5 от 2000мг/кг, группа 6 являлась контрольной группой и получала подкожно натрия хлорид 0,09% в дозе 1/5 от 2000мг/кг.</p><p>В результате проведения исследований субхронической токсичности на лабораторных животных лекарственного препарата L-карнитин для ветеринарного применения при подкожном и внутримышечном введении установлено, что дозировка 1/5 от максимальной переносимой, так и в дозировка 1/10 от максимальной переносимой, не вызывает изменения динамики массы тела животных.</p></abstract><trans-abstract xml:lang="en"><p>In recent years, several studies have been published that suggest that L-carnitine supplementation may affect weight in some animal species and humans, and may also affect the body composition of growing animals. Currently, only a few results are available on the effects of L-carnitine on weight loss and body composition in animals. Therefore, the purpose of this study was to find out whether injections of L-carnitine can influence the dynamics of the weight of laboratory animals. Toxicity studies were conducted on outbred rats in October 2021 in the vivarium of the St. Petersburg State University of Veterinary Medicine. The study involved females weighing 190-210 grams, purchased from the Federal State Unitary Enterprise “Nursery of Laboratory Animals “RAPPOLOVO”. When studying subchronic toxicity after subcutaneous and intramuscular administration, L-carnitine was administered at 2 dose levels. Doses were determined based on the results of the acute toxicity experiment: 1/5 and 1/10 of the maximum tolerated dose. The first experimental group (n=10) received the drug intramuscularly at a dose of 0.08 mg/kg (1/5 of 2000 mg/kg). The second experimental group (n=10) received the drug intramuscularly at a dose of 0.04 mg/kg (1/10 of 2000 mg/kg). The third experimental group received subcutaneous L -carnitine at a dose of 0.08 mg/kg (1/5 of 2000 mg/kg), the fourth experimental group received subcutaneous L-carnitine at a dose of 1/10 of the maximum tolerated (2000 mg/kg body weight). Group 5 was the control group (n=10) and received sodium chloride 0.09% intramuscularly at a dose of 1/5 of 2000 mg/kg, group 6 was the control group and received sodium chloride 0.09% subcutaneously at a dose of 1/5 of 2000 mg /kg. As a result of studies of subchronic toxicity on laboratory animals of the drug L-carnitine for veterinary use with subcutaneous and intramuscular administration, it was established that a dosage of 1/5 of the maximum tolerated, and a dosage of 1/10 of the maximum tolerated, does not cause changes in the dynamics of body weight animals.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>L-карнитин</kwd><kwd>масса тела</kwd><kwd>лабораторные животные</kwd><kwd>подкожное введение</kwd><kwd>внутримышечное введение</kwd><kwd>субхроническая токсичность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>L-carnitine</kwd><kwd>body weight</kwd><kwd>laboratory animals</kwd><kwd>subcutaneous administration</kwd><kwd>intramuscular administration</kwd><kwd>subchronic toxicity</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">Езерская Ю. А. 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