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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">scbmt</journal-id><journal-title-group><journal-title xml:lang="ru">БИОМЕДИЦИНА</journal-title><trans-title-group xml:lang="en"><trans-title>Journal Biomed</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2074-5982</issn><issn pub-type="epub">2713-0428</issn><publisher><publisher-name>Scientific center of biomedical technologies of Federal Medical and Biological Agency</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.33647/2074-5982-21-4-119-124</article-id><article-id custom-type="elpub" pub-id-type="custom">scbmt-1809</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>ДОКЛИНИЧЕСКИЕ ИССЛЕДОВАНИЯ В БИОМЕДИЦИНЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>NON-CLINICAL RESEARCH IN BIOMEDICINE</subject></subj-group></article-categories><title-group><article-title>Модифицированный стресс-протекторный эффект гидроксизина у цыплят-бройлеров при высокой плотности посадки</article-title><trans-title-group xml:lang="en"><trans-title>Modified Stress-Protective Effect of Hydroxyzine in Broiler Chickens at High Stocking Density</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>Ксенофонтов</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Ksenofontov</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ксенофонтов Дмитрий Анатольевич, д.б.н., доц.</p><p>127434, Москва, ул. Тимирязевская, 49</p></bio><bio xml:lang="en"><p>Dmitriy A. Ksenofontov, Dr. Sci. (Biol.), Assoc. Prof.</p><p>127434, Moscow, Timiryazevskaya Str., 49</p></bio><email xlink:type="simple">smu@rgau-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>Мурадян</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Muradyan</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мурадян Екатерина Андреевна</p><p>127434, Москва, ул. Тимирязевская, 49</p></bio><bio xml:lang="en"><p>Ekaterina А. Muradyan</p><p>127434, Moscow, Timiryazevskaya Str., 49</p></bio><email xlink:type="simple">muradyan@rgau-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>Ксенофонтова</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Ksenofontova</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ксенофонтова Анжелика Александровна, к.б.н., доц.</p><p>127434, Москва, ул. Тимирязевская, 49</p></bio><bio xml:lang="en"><p>Anzhelika A. Ksenofontova, Cand. Sci. (Biol.), Assoc. Prof.</p><p>127434, Moscow, Timiryazevskaya Str., 49</p></bio><email xlink:type="simple">angel-ksen@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБОУ ВО «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><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>18</day><month>12</month><year>2025</year></pub-date><volume>21</volume><issue>4</issue><fpage>119</fpage><lpage>124</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ксенофонтов Д.А., Мурадян Е.А., Ксенофонтова А.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Ксенофонтов Д.А., Мурадян Е.А., Ксенофонтова А.А.</copyright-holder><copyright-holder xml:lang="en">Ksenofontov D.A., Muradyan E.A., Ksenofontova A.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://journal.scbmt.ru/jour/article/view/1809">https://journal.scbmt.ru/jour/article/view/1809</self-uri><abstract><p>В эксперименте на цыплятах-бройлерах кросса «Смена-9» исследовано влияние анксиолитика гидроксизина и его комплекса с аскорбиновой кислотой на лейкоцитарный профиль птицы в условиях технологического стресса при повышении плотности посадки. При увеличении плотности посадки в 1,5 раза у цыплят в период интенсивного роста отмечается экстремальная стресс-реакция, которая сопровождается изменениями в системе крови. Определено количественное содержание лейкоцитов и процентное соотношение 5 субпопуляций лейкоцитов. Для оценки стресс-индуцированных изменений морфологических показателей проведено взвешивание внутренних органов. Установлены изменения показателей белой крови и увеличение относительной массы сердца, печени и почек при повышении плотности посадки. Выявлена тенденция к снижению уровня лейкоцитов при использовании гидроксизина как отдельно, так и совместно с аскорбиновой кислотой. Комплексное использование изучаемых препаратов незначительно смещает индексы (лимфоцитарный, сдвига лейкоцитов, иммунореактивности, показатель состояния) к значениям контрольной группы. Использование гидроксизина и витамина С снижает относительную массу сердца, легких и печени цыплят-бройлеров. Сделано заключение о положительном эффекте комплексного применения препаратов на адаптационные показатели путем мобилизации резистентных механизмов и воздействия на функциональную активность вегетативных органов.</p></abstract><trans-abstract xml:lang="en"><p>An experiment on broiler chickens of the Smena-9 cross was conducted to study the effect of hydroxyzine, an anxiolytic, and its complex with ascorbic acid on the leukocyte profile under technological stress, namely an increase in stocking density. An increase in this indicator by 1.5 times in chickens during the period of intensive growth was found to trigger an extreme stress reaction, which is accompanied by changes in the blood system. The quantitative content of leukocytes and the percentage of five leukocyte subpopulations were determined. To assess stress-induced changes in morphological parameters, internal organs were weighed. An increase in stocking density led to changes in white blood cell parameters and an increase in the relative mass of the heart, liver, and kidneys. A trend towards a decrease in relative leukocytosis was revealed when using hydroxyzine both separately and together with ascorbic acid. The combined use of the studied preparations slightly shifts the indices (lymphocyte, leukocyte shift, immunoreactivity, condition index) to the values of the control group. The use of hydroxyzine and vitamin C reduces the relative weight of the heart, lungs, and liver. The conclusion is made about the positive effect of the combined use of the studied preparations on adaptation mechanisms, by mobilizing resistant mechanisms and influencing the functional activity of vegetative organs.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>стресс</kwd><kwd>гидроксизин</kwd><kwd>аскорбиновая кислота</kwd><kwd>лейкоциты</kwd><kwd>бройлеры</kwd></kwd-group><kwd-group xml:lang="en"><kwd>stress</kwd><kwd>hydroxyzine</kwd><kwd>ascorbic acid</kwd><kwd>leukocytes</kwd><kwd>broilers</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">Пронин А.В., Громова О.А., Сардарян И.С. и др. Адаптогенные и нейропротекторные свойства аскорбата лития. Neurosci. Behav. Phys. 2018;48:409–415. DOI: 10.1007/s11055-018-0579-3.</mixed-citation><mixed-citation xml:lang="en">Pronin A.V., Gromova O.A., Sardaryan I.S., et al. 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