<?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>0120-0690</journal-id>
<journal-title><![CDATA[Revista Colombiana de Ciencias Pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Colom Cienc Pecua]]></abbrev-journal-title>
<issn>0120-0690</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-06902025000200001</article-id>
<article-id pub-id-type="doi">10.17533/udea.rccp.v38n2a7</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Ejaculate traits of ram lambs with different rectal temperatures under heat stress conditions]]></article-title>
<article-title xml:lang="es"><![CDATA[Características del eyaculado de corderos con diferente temperatura rectal bajo condiciones de estrés térmico]]></article-title>
<article-title xml:lang="pt"><![CDATA[Características do ejaculado de cordeiros com diferentes temperaturas retais sob estresse térmico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[McCormick-Palacios]]></surname>
<given-names><![CDATA[Jorge-Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Valverde]]></surname>
<given-names><![CDATA[Gustavo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñoz-García]]></surname>
<given-names><![CDATA[Canuto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maldonado-Jáquez]]></surname>
<given-names><![CDATA[Jorge-Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Aquino]]></surname>
<given-names><![CDATA[Saúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Garivay]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camacho-Morales]]></surname>
<given-names><![CDATA[Reyna-Lucero]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avelar-Lozano]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Maldonado]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California Instituto de Ciencias Agrícolas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Departamento de Estadística ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Guerrero Facultad de Medicina y Veterinaria No. 1 ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Campo Experimental la Laguna ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<volume>38</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-06902025000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-06902025000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-06902025000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background:  Heat stress reduces semen quality in rams.  Objective:  To evaluate the productive and reproductive responses of rams and ram lambs with different rectal temperatures under heat stress conditions.  Methods:  The animals (n = 12, Dorper × Katadhin × Pelibuey crossbreed, aged 235 to 730 days) were assigned to one of three experimental groups: ram lambs with low rectal temperature (RLLRT), ram lambs with high rectal temperature (RLHRT), and Rams.  Results:  Afternoon rectal temperatures were higher (p &#8804; 0.05) in the RLHRT group, and there was no difference (p &gt; 0.05) between the Rams and RLHRT groups. Ejaculate volume and sperm concentration were higher (p &#8804; 0.05) in the Rams group than in the RLLRT and RLHRT groups. Mass motility and sperm concentration were lower (p &#8804; 0.05) in the RLLRT group than in the RLHRT and Rams groups. Average daily weight gain did not differ (p &gt; 0.05) between the RLLRT and RLHRT groups.  Conclusion:  The selection of ram lambs with low rectal temperature under heat stress conditions did not provide any benefit in terms of average daily weight gain or ejaculate traits.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes:  El estrés calórico reduce la calidad del semen en carneros.  Objetivo:  Evaluar las respuestas productivas y reproductivas de carneros y corderos con diferente temperatura rectal bajo condiciones de estrés calórico.  Métodos:  Los animales (n = 12, cruza de Dorper × Katadhin × Pelibuey, de 235 a 730 días de edad) fueron asignados a uno de tres grupos experimentales: corderos con temperatura rectal baja (RLLRT), corderos con temperatura rectal alta (RLHRT), y Carneros.  Resultados:  Las temperaturas rectales fueron mayores (p &#8804; 0.05) en el grupo RLHRT que en el RLLRT; sin embargo, no se encontraron diferencias (p &gt; 0.05) entre este y el grupo de Carneros. El volumen del eyaculado y la concentración espermática fueron mayores (p &#8804; 0.05) en el grupo de Carneros que en los grupos RLLRT y RLHRT. La motilidad masal y la concentración espermática fueron menores (p &#8804; 0.05) en el grupo RLLRT que en los grupos RLHRT y Carneros. La ganancia diaria de peso no fue diferente (p &gt; 0.05) entre los grupos RLLRT y RLHRT.  Conclusión:  La selección de corderos con temperatura rectal baja en condiciones de estrés calórico no proporciona beneficios en su ganancia de peso ni en las características del eyaculado.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Antecedentes:  O estresse térmico reduz a qualidade do sêmen em carneiros.  Objetivo:  Avaliar as respostas produtivas e reprodutivas de carneiros e cordeiros com diferentes temperaturas retais sob condições de estresse térmico.  Métodos:  Os animais (n = 12, cruzamento Dorper × Katadhin × Pelibuey, com idade entre 235 e 730 dias) foram distribuídos em um dos três grupos experimentais: cordeiros com baixa temperatura retal (RLLRT), cordeiros com alta temperatura retal (RLHRT), e Carneiros.  Resultados:  As temperaturas retais foram maiores (p &#8804; 0,05) no grupo RLHRT do que no RLLRT, mas não foram encontradas diferenças (p &gt; 0,05) entre este e o grupo Carneiros. O volume ejaculado e a concentração espermática foram maiores (p &#8804; 0,05) no grupo Carneiros do que nos grupos RLLRT e RLHRT. A motilidade massal e a concentração espermática foram menores (p &#8804; 0,05) no grupo RLLRT do que nos grupos RLHRT e Carneiros. O ganho de peso diário não foi diferente (p &gt; 0,05) entre os grupos RLLRT e RLHRT.  Conclusão:  A seleção de cordeiros com baixa temperatura retal sob condições de estresse térmico não apresenta benefícios para o ganho de peso nem para as características da ejaculação.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[heat stress]]></kwd>
<kwd lng="en"><![CDATA[motility]]></kwd>
<kwd lng="en"><![CDATA[rams]]></kwd>
<kwd lng="en"><![CDATA[resilience]]></kwd>
<kwd lng="en"><![CDATA[ruminants]]></kwd>
<kwd lng="en"><![CDATA[semen]]></kwd>
<kwd lng="en"><![CDATA[sperm]]></kwd>
<kwd lng="en"><![CDATA[testicle]]></kwd>
<kwd lng="es"><![CDATA[espermatozoide]]></kwd>
<kwd lng="es"><![CDATA[estrés calórico]]></kwd>
<kwd lng="es"><![CDATA[carnero]]></kwd>
<kwd lng="es"><![CDATA[motilidad]]></kwd>
<kwd lng="es"><![CDATA[resistencia]]></kwd>
<kwd lng="es"><![CDATA[semen]]></kwd>
<kwd lng="es"><![CDATA[testículo]]></kwd>
<kwd lng="pt"><![CDATA[carneiro]]></kwd>
<kwd lng="pt"><![CDATA[esperma]]></kwd>
<kwd lng="pt"><![CDATA[estresse térmico]]></kwd>
<kwd lng="pt"><![CDATA[motilidade]]></kwd>
<kwd lng="pt"><![CDATA[resistência]]></kwd>
<kwd lng="pt"><![CDATA[sêmen]]></kwd>
<kwd lng="pt"><![CDATA[testículo]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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