<?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>2215-3470</journal-id>
<journal-title><![CDATA[Uniciencia]]></journal-title>
<abbrev-journal-title><![CDATA[Uniciencia]]></abbrev-journal-title>
<issn>2215-3470</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional, Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2215-34702025000100184</article-id>
<article-id pub-id-type="doi">10.15359/ru.39-1.10</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Diferencias morfométricas de las subpoblaciones espermáticas en semen descongelado de dos subespecies bovinas]]></article-title>
<article-title xml:lang="en"><![CDATA[Morphometric differences in sperm subpopulations in frozen-thawed semen of two bovine subspecies]]></article-title>
<article-title xml:lang="pt"><![CDATA[Diferenças morfométricas de subpopulações de espermatozoides em sêmen descongelado de duas subespécies bovinas]]></article-title>
</title-group>
<contrib-group>
<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[Silvestre]]></surname>
<given-names><![CDATA[Miguel A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrientos]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dahl-Corcini]]></surname>
<given-names><![CDATA[Carine]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Víquez]]></surname>
<given-names><![CDATA[Luis]]></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[,Costa Rica Institute of Technology School of Agronomy Laboratory of Animal Reproduction]]></institution>
<addr-line><![CDATA[San Carlos Campus Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Costa Rica Institute of Technology School of Agronomy Laboratory of Animal Reproduction]]></institution>
<addr-line><![CDATA[San Carlos Campus Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Valencia Department of Cellular Biology Functional Biology and Physical Anthropology]]></institution>
<addr-line><![CDATA[Campus Burjassot Burjassot]]></addr-line>
<country>España</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Costa Rica Institute of Technology School of Agronomy Laboratory of Animal Reproduction]]></institution>
<addr-line><![CDATA[San Carlos Campus Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,University of Veracruz School of Veterinary Medicine and Animal Science Laboratory of Reproductive Biology]]></institution>
<addr-line><![CDATA[Veracruz ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidade Federal de Pelotas (UFPel) Faculdade de Veterinária ReproPel]]></institution>
<addr-line><![CDATA[Campus Capão do Leão, Campus Universitário Pelotas, RS]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Costa Rica Institute of Technology School of Agronomy Laboratory of Animal Reproduction]]></institution>
<addr-line><![CDATA[San Carlos Campus Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af8">
<institution><![CDATA[,Costa Rica Institute of Technology School of Agronomy Laboratory of Animal Reproduction]]></institution>
<addr-line><![CDATA[San Carlos Campus 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>39</volume>
<numero>1</numero>
<fpage>184</fpage>
<lpage>197</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S2215-34702025000100184&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S2215-34702025000100184&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S2215-34702025000100184&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  (Objetivo)  El objetivo fue la caracterización de diferentes subpoblaciones basada en parámetros morfométricos de semen descongelado de dos subespecies de ganado, utilizando un sistema CASA.  (Metodología)  El experimento se realizó en el Instituto Tecnológico de Costa Rica (ITCR), entre los meses de mayo y diciembre de 2023. Se analizaron dosis seminales de 10 toros (5 animales por cada subespecie, Bostaurus y Bos indicus y fueron evaluados luego de la descongelación de las dosis seminales usando ISAS®v1, CASA-Sistema de morfometría. Se empleó análisis multivariado a partir de componentes principales (PC) y métodos de agrupación (k-means model) por medio de las evaluaciones de la morfometría de la cabeza.  (Resultados)  El eyaculado de los toros exhibe una heterogeneidad significativa y comprende diversas subpoblaciones de espermatozoides con diferentes patrones morfométricos. Se identificaron tres subpoblaciones diferentes de espermatozoides a partir de tres PC asociados a: tamaño, forma y simetría de la cabeza y el grado en que eran piriformes. Las proporciones de las subpoblaciones encontradas de espermatozoides variaron en las dos subespecies bovinas: Bos taurus y Bos indicus. SP1, SP2 y SP3 (subpoblaciones) fueron diferentes para los criterios de los PC y las variaciones fueron importantes. La variabilidad en las evaluaciones de la morfometría espermática ratifica la necesidad de estandarizar los protocolos de evaluación del semen.  (Conclusiones)  Estos hallazgos resaltan la importancia de conocer la diversidad en la morfometría espermática entre subespecies, tanto para mejorar las pruebas de evaluación in vitro, como para distinguir las subespecies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  (Objetive)  The objective was to characterize different sperm subpopulations based on morphometric parameters of frozen-thawed semen in two bovine subspecies using a CASA system.  (Methodology)  The experiment was carried out at the Costa Rica Institute of Technology from May to December 2023. Spermatozoa from 10 bulls (five animals of each subspecies, Bos taurus and Bos indicus) were evaluated after thawing of the semen doses by an ISAS®v1, Computer-Assisted Sperm Analysis (CASA)-Morph system. Sub-populations of head morphometric spermatozoa were characterized using multivariate procedures such as principal components (PCs) analysis and clustering methods (k-means model)  (Results)  The ejaculate of male exhibits significant heterogeneity and comprises diverse sperm subpopulations with differing morphometric patterns. Three different sperm subpopulations were identified from three PCs: head size, head shape, and symmetry of the sperm head and the degree to which it was pyriform. The proportions of the different sperm subpopulations varied in the two-bovine subspecies; Bos taurus and Bos indicus. Results indicated that subpopulations SP1, SP2, and SP3 were different for PC criteria and these differences were relevant. The variability in sperm morphometry assessments underscores the need to standardize semen evaluation protocols.  (Conclusions) These findings highlight the importance of knowing the diversity in sperm morphometry between subspecies to both improve in vitro evaluation tests and to distinguish subspecies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  (Objetivo)  O objetivo foi a caracterização de diferentes subpopulações com base em parâmetros morfométricos de sêmen descongelado de duas subespécies de bovinos utilizando um sistema CASA.  (Metodologia)  O experimento foi realizado no Instituto Tecnológico da Costa Rica (ITCR), entre os meses de maio e dezembro de 2023. Foram analisadas doses de sêmen de 10 touros (5 animais para cada subespécie, Bos taurus e Bos indicus e foram avaliados após o descongelamento das doses seminais usando ISAS®v1, CASA-Sistema de morfometria. Utilizou-se análise multivariada a partir de componentes principais (PC) e métodos de agrupamento (modelo k-means) por meio das avaliações da morfometria da cabeça.  (Resultados)  A ejaculação dos touros exibe heterogeneidade significativa e compreende várias subpopulações de espermatozoides com diferentes padrões morfométricos. Três subpopulações diferentes de espermatozoides foram identificadas a partir de três PCs associados a: tamanho, forma e simetria da cabeça e o grau em que eram piriformes. As proporções das subpopulações de espermatozoides encontradas variaram nas duas subespécies bovinas; Bos taurus e Bos indicus. SP1, SP2 e SP3 (subpopulações) foram diferentes para os critérios de PC e as variações foram significativas. A variabilidade nas avaliações da morfometria espermática ratifica a necessidade de padronizar os protocolos de avaliação do sêmen.  (Conclusões)  Essas descobertas destacam a importância de conhecer a diversidade na morfometria espermática entre as subespécies, tanto para melhorar os testes de avaliação in vitro quanto para distinguir as subespécies.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Biology]]></kwd>
<kwd lng="en"><![CDATA[cattle]]></kwd>
<kwd lng="en"><![CDATA[spermatozoa]]></kwd>
<kwd lng="en"><![CDATA[subspecies]]></kwd>
<kwd lng="en"><![CDATA[morphometry analysis]]></kwd>
<kwd lng="en"><![CDATA[subpopulation]]></kwd>
<kwd lng="es"><![CDATA[Biología]]></kwd>
<kwd lng="es"><![CDATA[Ganado]]></kwd>
<kwd lng="es"><![CDATA[espermatozoide]]></kwd>
<kwd lng="es"><![CDATA[subespecie]]></kwd>
<kwd lng="es"><![CDATA[análisis de morfometría]]></kwd>
<kwd lng="es"><![CDATA[subpoblación]]></kwd>
<kwd lng="pt"><![CDATA[biologia]]></kwd>
<kwd lng="pt"><![CDATA[gado]]></kwd>
<kwd lng="pt"><![CDATA[espermatozoide]]></kwd>
<kwd lng="pt"><![CDATA[subespécie]]></kwd>
<kwd lng="pt"><![CDATA[análise morfométrica]]></kwd>
<kwd lng="pt"><![CDATA[subpopulação]]></kwd>
</kwd-group>
</article-meta>
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