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  <leader>04814nab a2200289 i 4500</leader>
  <controlfield tag="003">BR-BrBNA</controlfield>
  <controlfield tag="005">20250120100554.0</controlfield>
  <controlfield tag="008">250120b2016    bl.|r|pooa||| 00| 0 eng |</controlfield>
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    <subfield code="a">BR-BrBNA</subfield>
    <subfield code="b">eng</subfield>
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  <datafield tag="072" ind1=" " ind2=" ">
    <subfield code="a">L53</subfield>
    <subfield code="b">5213</subfield>
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  <datafield tag="100" ind1=" " ind2=" ">
    <subfield code="a">Reis, L.S.L.S. </subfield>
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  <datafield tag="100" ind1=" " ind2=" ">
    <subfield code="a">Ramos, A.A.</subfield>
  </datafield>
  <datafield tag="100" ind1=" " ind2=" ">
    <subfield code="a">Camargos, A.S. </subfield>
  </datafield>
  <datafield tag="100" ind1=" " ind2=" ">
    <subfield code="a">Oba, E. </subfield>
  </datafield>
  <datafield tag="245" ind1=" " ind2=" ">
    <subfield code="a">Integrity of the plasma membrane, the acrosomal membrane, and the mitochondrial membrane potential of sperm in Nelore bulls from puberty to sexual maturity</subfield>
  </datafield>
  <datafield tag="500" ind1=" " ind2=" ">
    <subfield code="a">

Publica&#xE7;&#xE3;o online; 34 ref.; Summaries  (En, Pt)</subfield>
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ABSTRACT - This study evaluated the plasma membrane integrity, acrosomal membrane integrity, and mitochondrial membrane potential of Nelore bull sperm from early puberty to early sexual maturity and their associations with sperm motility and vigor, the mass motility of the spermatozoa (wave motion), scrotal circumference, and testosterone. Sixty Nelore bulls aged 18 to 19 months were divided into four lots (n=15 bulls/lot) and evaluated over 280 days. Semen samples, collected every 56 days by electroejaculation, were evaluated soon after collection for motility, vigor and wave motion under an optical microscope. Sperm membrane integrity, acrosomal integrity, and mitochondrial activity were evaluated under a fluorescent microscope using probe association (FITC-PSA, PI, JC-1, H342). The sperm were classified into eight integrity categories depending on whether they exhibited intact or damaged membranes, an intact or damaged acrosomal membrane, and high or low mitochondrial potential. The results show that bulls have a low amount of sperm with intact membranes at puberty, and the sperm show low motility, vigor, and wave motion; however, in bulls at early sexual maturity, the integrity of the sperm membrane increased significantly. The rate of sperm membrane damage was negatively correlated with motility, vigor, wave motion, and testosterone in the bulls, and a positive correlation existed between sperm plasma membrane integrity and scrotal circumference. The integrity of the acrosomal membrane was not influenced by puberty. During puberty and into early sexual maturity, bulls show low sperm mitochondrial potential, but when bulls reached sexual maturity, high membrane integrity with high mitochondrial potential was evident.


Keywords: sexual development, sperm motility, sperm vigor, testosterone, cattle </subfield>
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  <datafield tag="520" ind1=" " ind2=" ">
    <subfield code="a">


RESUMO - Este estudo avaliou a integridade da membrana plasm&#xE1;tica, da membrana acrossomal e o potencial da membrana mitocondrial de espermatozoides de touros da ra&#xE7;a Nelore da puberdade at&#xE9; &#xE0; maturidade sexual e suas correla&#xE7;&#xF5;es com motilidade, vigor, turbilh&#xE3;o dos espermatozoides, circunfer&#xEA;ncia escrotal e testosterona. Sessenta touros da ra&#xE7;a Nelore, com idade entre 18 e 19 meses, foram divididos em quatro lotes (n=15 touros / lote) e foram avaliados por 280 dias. Coletaram-se as amostras de s&#xEA;men a cada 56 dias por eletroejacula&#xE7;&#xE3;o e, logo ap&#xF3;s, foram determinados a motilidade, o vigor e o turbilh&#xE3;o dos espermatozoides por microscopia &#xF3;ptica. A integridade da membrana de esperma, da membrana acrosomal e da atividade mitocondrial foi avaliada por microscopia de fluoresc&#xEA;ncia, utilizando-se associa&#xE7;&#xE3;o das sondas (FITC-PSA, PI, JC-1, H342). Os espermatozoides foram classificados em oito categorias de integridade, dependendo se eles exibiram membranas plasm&#xE1;tica e mitocondrial intactas ou danificadas e potencial mitocondrial elevado ou baixo. Os resultados mostram que os touros t&#xEA;m uma baixa quantidade de espermatozoides com membranas &#xED;ntegras na puberdade, com baixa motilidade, vigor e turbilh&#xE3;o. No entanto, nos touros na maturidade sexual precoce, a integridade da membrana dos  espermatozoides aumentou significativamente. A taxa de dano &#xE0; membrana esperm&#xE1;tica foi negativamente correlacionada com a motilidade, o vigor, o movimento das ondas e a concentra&#xE7;&#xE3;o de testosterona nos touros, e uma correla&#xE7;&#xE3;o positiva existiu entre a integridade da membrana plasm&#xE1;tica e a circunfer&#xEA;ncia escrotal. A integridade da membrana acrossomal n&#xE3;o foi influenciada pela puberdade.


Palavras-chave: desenvolvimento sexual, motilidade de espermatozoides, vigor esperm&#xE1;tico, testosterona, bovino </subfield>
  </datafield>
  <datafield tag="650" ind1=" " ind2=" ">
    <subfield code="a">GADO NELORE</subfield>
  </datafield>
  <datafield tag="650" ind1=" " ind2=" ">
    <subfield code="a">REPRODU&#xC7;&#xC3;O ANIMAL</subfield>
  </datafield>
  <datafield tag="650" ind1=" " ind2=" ">
    <subfield code="a">ESPERMATOZOIDE</subfield>
  </datafield>
  <datafield tag="650" ind1=" " ind2=" ">
    <subfield code="a">TESTOSTERONA</subfield>
  </datafield>
  <datafield tag="773" ind1="0" ind2=" ">
    <subfield code="0">1643</subfield>
    <subfield code="9">347391</subfield>
    <subfield code="d">Belo Horizonte-MG Universidade Federal de Minas Gerais - Escola de Veterinaria 1983</subfield>
    <subfield code="o">2024-8404</subfield>
    <subfield code="t">Arquivo Brasileiro de Medicina Veterin&#xE1;ria e Zootecnia (Brazil)</subfield>
    <subfield code="x">0102-0935</subfield>
    <subfield code="g">v. 68(3) p. 620-628; (2026)</subfield>
    <subfield code="w">BR2024004465</subfield>
  </datafield>
  <datafield tag="856" ind1=" " ind2=" ">
    <subfield code="u">https://www.scielo.br/j/abmvz/a/75GFvMRD7XXB5KXfPTM945S/?format=pdf&amp;lang=en</subfield>
  </datafield>
  <datafield tag="942" ind1=" " ind2=" ">
    <subfield code="c">ANA</subfield>
  </datafield>
  <datafield tag="999" ind1=" " ind2=" ">
    <subfield code="c">329612</subfield>
    <subfield code="d">329612</subfield>
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