<?xml version="1.0" encoding="ISO-8859-1"?><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">
<front>
<journal-meta>
<journal-id>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212025000100022</article-id>
<article-id pub-id-type="doi">10.15517/am.2025.63141</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variaciones en la estructura subpoblacional cinemática del semen criopreservado de ganado lechero]]></article-title>
<article-title xml:lang="en"><![CDATA[Kinematic subpopulation structure variations in cryopreserved semen from dairy cattle]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís]]></surname>
<given-names><![CDATA[Juan M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sevilla]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Araya-Zúñiga]]></surname>
<given-names><![CDATA[Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Matamoros]]></surname>
<given-names><![CDATA[Kenneth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murillo]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cervantes]]></surname>
<given-names><![CDATA[Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valverde]]></surname>
<given-names><![CDATA[Anthony]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica Escuela de Agronomía Centro de Investigación y Desarrollo en Agricultura Sostenible del Trópico Húmed]]></institution>
<addr-line><![CDATA[San Carlos Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica Doctorado en Ciencias Naturales para el Desarrollo (DOCINADE) ]]></institution>
<addr-line><![CDATA[ Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica Área Académica del Doctorado en Ciencias Naturales para el Desarrollo (DOCINADE) ]]></institution>
<addr-line><![CDATA[ Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica Escuela de Agronomía Centro de Investigación y Desarrollo en Agricultura Sostenible del Trópico Húmedo]]></institution>
<addr-line><![CDATA[San Carlos Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica Escuela de Agronomía Centro de Investigación y Desarrollo en Agricultura Sostenible del Trópico Húmedo]]></institution>
<addr-line><![CDATA[San Carlos Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Veracruzana Facultad de Medicina Veterinaria y Zootecnia Maestría en Ciencia Animal]]></institution>
<addr-line><![CDATA[ Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Universidad Veracruzana Facultad de Medicina Veterinaria y Zootecnia Maestría en Ciencia Animal]]></institution>
<addr-line><![CDATA[ Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af8">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica Escuela de Agronomía Centro de Investigación y Desarrollo en Agricultura Sostenible del Trópico Húmedo]]></institution>
<addr-line><![CDATA[San Carlos Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<volume>36</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212025000100022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212025000100022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212025000100022&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción.  En la industria lechera, el semen congelado-descongelado es importante para la inseminación artificial y la mejora genética del ganado. Objetivo. Evaluar la variación en la estructura subpoblacional cinemática del semen congelado-descongelado en razas Jersey y Holstein usando un sistema CASA-mot. Materiales y métodos. El estudio se realizó de abril a noviembre de 2023, en el Laboratorio de Reproducción Animal (AndroTEC), ubicado en el Campus Tecnológico Local San Carlos, Alajuela, Costa Rica. Se utilizaron ocho animales de las razas Holstein y Jersey, y se analizaron nueve dosis de semen congelado-descongelado por animal para cada raza. Se descongelaron a 37 °C durante 30 s, 72 dosis de semen provenientes de ocho toros (cuatro de cada raza) a 37 °C durante 30 s. La movilidad y las variables cinemáticas se analizaron utilizando la tecnología CASA-mot (Computer-Assisted Semen Analysis). Resultados. La raza Jersey presentó mostró mayores porcentajes de espermatozoides móviles totales, móviles progresivos y rápidos en comparación con la raza Holstein (P &lt; 0,05). El análisis de factores principales reveló dos factores significativos que explicaron el 87,5 % de la varianza total en las variables cinemáticas. Las variables cinemáticas entre subpoblaciones espermáticas (SP) presentaron diferencias (P &lt; 0,05) en ambas razas. La subpoblación SP2 fue la más veloz, con valores más altos en velocidad curvilínea (VCL), velocidad rectilínea (VSL) y velocidad de trayectoria promedio (VAP) tanto para los toros Holstein como los Jersey. Conclusiones. Se encontraron diferencias cinemáticas entre las subpoblaciones identificadas para en ambas razas. Los patrones cinemáticos de las subpoblaciones presentes en el eyaculado podrían influir en la fertilidad y rendimiento reproductivo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction.  In the dairy industry, frozen-thawed semen is crucial for artificial insemination and genetic improvement of cattle. Objective. To evaluate the variation in the kinematic subpopulation structure of frozen-thawed semen in Jersey and Holstein breeds using a CASA-mot system. Materials and Methods. The study was conducted from April to November 2023, at the Animal Reproduction Laboratory (AndroTEC), located at the Campus Tecnológico Local San Carlos, Alajuela, Costa Rica. Eight animals from the Holstein and Jersey breeds were used, and nine doses of frozen-thawed semen per animal were analyzed for each breed. A total of 72 semen doses from eight bulls (four from each breed) were thawed at 37 °C for 30 s. Sperm motility and kinematic variables were analyzed using CASA-mot (Computer-Assisted Semen Analysis) technology. Results. The Jersey breed presented higher percentages of total motile, progressive motile, and rapid spermatozoa compared to the Holstein breed (P &lt; 0.05). Principal component analysis revealed two significant factors explaining 87.5 % of the total variance in kinematic variables. The kinematic variables between sperm subpopulations (SP) showed differences (P &lt; 0.05) in both breeds. Subpopulation SP2 was the fastest, with higher values for curvilinear speed (VCL), straight-line speed (VSL), and average trajectory speed (VAP) in both Holstein and Jersey bulls. Conclusions. Kinematic differences were found between the identified subpopulations in both breeds. The kinematic patterns of the subpopulations present in the ejaculate could influence fertility and reproductive performance.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ciencia animal]]></kwd>
<kwd lng="es"><![CDATA[calidad del semen]]></kwd>
<kwd lng="es"><![CDATA[espermatozoide]]></kwd>
<kwd lng="es"><![CDATA[toros]]></kwd>
<kwd lng="es"><![CDATA[movilidad espermática]]></kwd>
<kwd lng="es"><![CDATA[inseminación artificial]]></kwd>
<kwd lng="en"><![CDATA[animal science]]></kwd>
<kwd lng="en"><![CDATA[semen quality]]></kwd>
<kwd lng="en"><![CDATA[spermatozoa]]></kwd>
<kwd lng="en"><![CDATA[bulls]]></kwd>
<kwd lng="en"><![CDATA[sperm motility]]></kwd>
<kwd lng="en"><![CDATA[artificial insemination]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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