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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">zootech</journal-id><journal-title-group><journal-title xml:lang="ru">Зоотехническая наука Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Zootechnical Science of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0134-9732</issn><publisher><publisher-name>Научно-практический центр Национальной академии наук Беларуси по животноводству</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zootech-653</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>ГЕНЕТИКА, РАЗВЕДЕНИЕ, СЕЛЕКЦИЯ, БИОТЕХНОЛОГИЯ РАЗМНОЖЕНИЯ И ВОСПРОИЗВОДСТВО</subject></subj-group></article-categories><title-group><article-title>ПОКАЗАТЕЛИ РОСТА, РАЗВИТИЯ И ЕСТЕСТВЕННОЙ РЕЗИСТЕНТНОСТИ РЕМОНТНЫХ БЫЧКОВ БЕЛОРУССКОЙ ЧЕРНО-ПЕСТРОЙ ПОРОДЫ В ЗАВИСИМОСТИ ОТ НАЛИЧИЯ МУТАЦИИ BLAD</article-title><trans-title-group xml:lang="en"><trans-title>Growth, Development and Natural Resistance Indices of Replacement Calves of Belarusian Black-motley Breed Depending on Presence of BLAD Mutation</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>Курак</surname><given-names>О. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Kurak</surname><given-names>O. P.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.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>Ганджа</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Gandzha</surname><given-names>A. I.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.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>Леткевич</surname><given-names>Л. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Letkevich</surname><given-names>L. L.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.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>Грибанова</surname><given-names>Ж. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Gribanova</surname><given-names>Z. A.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>РУП «Научно-практический центр Национальной академии наук Беларуси по животноводству»</institution></aff><aff xml:lang="en"><institution>RUE "Scientific and Practical Center of the National Academy of Sciences of Belarus on Animal Husbandry"</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2010</year></pub-date><pub-date pub-type="epub"><day>12</day><month>08</month><year>2022</year></pub-date><volume>45</volume><issue>1</issue><fpage>96</fpage><lpage>101</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Курак О.П., Ганджа А.И., Леткевич Л.Л., Грибанова Ж.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Курак О.П., Ганджа А.И., Леткевич Л.Л., Грибанова Ж.А.</copyright-holder><copyright-holder xml:lang="en">Kurak O.P., Gandzha A.I., Letkevich L.L., Gribanova Z.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://zootech.belal.by/jour/article/view/653">https://zootech.belal.by/jour/article/view/653</self-uri><abstract><p>Изучены показатели роста, развития и естественной резистентности ремонтных бычков белорусской черно-пестрой породы в возрасте шести месяцев в зависимости от наличия мутации BLAD РУСХП «Оршанское племпредприятие» Витебской области. Выявлены более низкие показатели живой массы и среднесуточного прироста у животных-носителей BLAD-синдрома. Установлено возрастание числа лейкоцитов (до 14,5 109/л ), а также снижение активности аспартатаминотрансферазы в сыворотке крови на 19,5 % в группе гетерозиготных бычков по сравнению со здоровыми животными.</p></abstract><trans-abstract xml:lang="en"><p>Growth, development and natural resistance indices of replacement calves of Belarusian Black-motley breed of 6 months of age depending on presence of BLAD mutation were studied at Enterprise “Orshanskoe pedigree plant” in Vitebsk region. The lower indices of live weight and average daily weight gain were registered with animals with BLAD-syndrome. The increase of leucocytes quantity (up to 14,5 109/l) as well as decrease of aspartate aminotransferase activity in blood serum at 19,5 % was determined in the group with heterozygous calves compared to healthy animals.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>крупный рогатый скот</kwd><kwd>мутация BLAD</kwd><kwd>показатели естественной резистентности</kwd></kwd-group><kwd-group xml:lang="en"><kwd>cattle</kwd><kwd>BLAD mutation</kwd><kwd>natural resistance indices</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">Identification and prevalence of a genetic defect that causes leucocyte adgesion deficiency in Holstein cattle / D. E. Shuster [et al] // Proc. Natl. Acad. 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