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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">RUDN Journal of Agronomy and Animal Industries</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Agronomy and Animal Industries</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Агрономия и животноводство</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2312-797X</issn><issn publication-format="electronic">2312-7988</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">19870</article-id><article-id pub-id-type="doi">10.22363/2312-797X-2023-18-1-116-123</article-id><article-id pub-id-type="edn">WTHIER</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Veterinary science</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Ветеринария</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Effect of L-carnitine administered via subcutaneous injection on hematological parameters of laboratory animals</article-title><trans-title-group xml:lang="ru"><trans-title>Исследования гематологических показателей при подкожном введении инъекционной формы препарата L-карнитин</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6516-8857</contrib-id><name-alternatives><name xml:lang="en"><surname>Sabirzyanova</surname><given-names>Lilia I.</given-names></name><name xml:lang="ru"><surname>Сабирзянова</surname><given-names>Лилия Ильгизовна</given-names></name></name-alternatives><bio xml:lang="en"><p>Assistant, Candidate of Veterinary Sciences</p></bio><bio xml:lang="ru"><p>кандидат ветеринарных наук, ассистент</p></bio><email>l-sabirzyanova@list.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5306-7303</contrib-id><name-alternatives><name xml:lang="en"><surname>Konovalova</surname><given-names>Gella V.</given-names></name><name xml:lang="ru"><surname>Коновалова</surname><given-names>Гелла Владимировна</given-names></name></name-alternatives><bio xml:lang="en"><p>Head of the Preclinical Research Department</p></bio><bio xml:lang="ru"><p>заведующий отделом доклинических исследований</p></bio><email>g.konovalova@vgnki.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9830-8799</contrib-id><name-alternatives><name xml:lang="en"><surname>Tokar</surname><given-names>Valentina V.</given-names></name><name xml:lang="ru"><surname>Токарь</surname><given-names>Варвара Вениаминовна</given-names></name></name-alternatives><bio xml:lang="en"><p>Deputy Head, Preclinical Research Department</p></bio><bio xml:lang="ru"><p>заместитель заведующего отделом доклинических исследований</p></bio><email>v.tokar@vgnki.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">St. Petersburg State University of Veterinary Medicine</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский государственный университет ветеринарной медицины</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">The Russian State Center for Animal Feed and Drug Standardization and Quality</institution></aff><aff><institution xml:lang="ru">Всероссийский государственный центр качества и стандартизации лекарственных средств для животных и кормов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-03-30" publication-format="electronic"><day>30</day><month>03</month><year>2023</year></pub-date><volume>18</volume><issue>1</issue><issue-title xml:lang="en">VOL 18, NO1 (2023)</issue-title><issue-title xml:lang="ru">ТОМ 18, №1 (2023)</issue-title><fpage>116</fpage><lpage>123</lpage><history><date date-type="received" iso-8601-date="2023-04-06"><day>06</day><month>04</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Sabirzyanova L.I., Konovalova G.V., Tokar V.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Сабирзянова Л.И., Коновалова Г.В., Токарь В.В.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Sabirzyanova L.I., Konovalova G.V., Tokar V.V.</copyright-holder><copyright-holder xml:lang="ru">Сабирзянова Л.И., Коновалова Г.В., Токарь В.В.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://agrojournal.rudn.ru/agronomy/article/view/19870">https://agrojournal.rudn.ru/agronomy/article/view/19870</self-uri><abstract xml:lang="en"><p style="text-align: justify;">To date, there is no registered injectable dosage form of levocarnitine for veterinary use on the territory of the Russian Federation. Based on the above, the purpose of our work was to conduct preclinical studies of L-carnitine of subchronic toxicity for veterinary use in laboratory animals. Experiments to test the toxicity were performed on outbred rats in October 2021 at the vivarium of St. Petersburg State University of Veterinary Medicine. The study involved females weighing 190…210 grams, purchased from RAPPOLOVO Laboratory Animal Nursery. To study subchronic toxicity via subcutaneous injection, L-carnitine was administered in 2 dose levels. The 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 subcutaneously at a dose of 0.08 mg/kg (1/5 of 2000 mg/kg). The second experimental group (n = 10) received the drug subcutaneously at a dose of 0.04 mg/kg (1/10 of 2000 mg/kg). The control group (n = 10) received sodium chloride 0.09 % subcutaneously at a dose of 1/5 of 2000 mg/kg. The drug was administered subcutaneously daily for 42 days. Killing and blood sampling from the second half of the animals was carried out after assessing the recovery period (10 days after drug cancellation). As a result of studies of subchronic toxicity of subcutaneously administered L-carnitine for veterinary use in laboratory animals, it was found that the dosage of 1/5 of the maximum tolerated, and the dosage of 1/10 of the maximum tolerated, do not cause external signs of toxicosis and death of rats. No significant changes in the hematological parameters of blood of animals from the experimental and control groups were found.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">На территории Российской Федерации нет зарегистрированной инъекционной лекарственной формы левокарнитина для ветеринарного применения. Проведены доклинические исследования L-карнитина для ветеринарного применения, в частности субхронической токсичности, на лабораторных животных. Исследования токсичности были проведены на аутбредных крысах в октябре 2021 г. в виварии Санкт-Петербургского государственного университета ветеринарной медицины. В исследовании участвовали самки весом 190…210 г, закупленные в Федеральном государственном унитарном предприятии «Питомник лабораторных животных «РАППОЛОВО»». Для изучения субхронической токсичности при подкожном введении L-карнитин вводили в 2 уровнях доз. Дозы определялись на основании результатов опыта по острой токсичности: 1/5 и 1/10 от максимальной переносимый дозы. Подопытные группы получали лекарственный препарат подкожно в дозе: первая (n = 10) - 0,08 мг/кг (1/5 от 2000 мг/кг), вторая (n = 10) - 0,04 мг/кг (1/10 от 2000 мг/кг). Контрольная группа (n = 10) получала подкожно натрия хлорид 0,09 % в дозе 1/5 от 2000 мг/кг. Препарат вводили ежедневно в течение 42 дней. Убой и отбор проб от второй половины животных проводили после оценки периода восстановления (через 10 дней после отмены препарата). В результате исследований установлено, что дозировка 1/5 от максимальной переносимой, как и дозировка 1/10 от максимальной переносимой, не вызывают внешних признаков токсикоза и гибели крыс. Значимых изменении в гематологических показателях крови животных опытных и контрольных групп не обнаружено.</p></trans-abstract><kwd-group xml:lang="en"><kwd>preclinical studies</kwd><kwd>clinical blood test</kwd><kwd>laboratory animals</kwd><kwd>subchronic toxicity</kwd><kwd>medicinal product</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>доклинические исследования</kwd><kwd>клинический анализ крови</kwd><kwd>лабораторные животные</kwd><kwd>субхроническая токсичность</kwd><kwd>лекарственный препарат</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Klementeva YI. The use of L-carnitine in a protected form in the diets of cows. 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