<?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>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282024000200024</article-id>
<article-id pub-id-type="doi">10.19136/era.a11n2.4004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Horn presence determines social rank in Dorper rams]]></article-title>
<article-title xml:lang="es"><![CDATA[La presencia de cuernos determina el rango social de carneros Dorper]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calderón-Leyva]]></surname>
<given-names><![CDATA[Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sifuentes-Lamont]]></surname>
<given-names><![CDATA[Pablo Iván]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras-Villarreal]]></surname>
<given-names><![CDATA[Viridiana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ángel-Garcia]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Ávalos]]></surname>
<given-names><![CDATA[Silvestre]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Veliz-Deras]]></surname>
<given-names><![CDATA[Francisco Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado-Espino]]></surname>
<given-names><![CDATA[Alan Sebastián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro  ]]></institution>
<addr-line><![CDATA[Torreón Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro Departamento de Producción Animal ]]></institution>
<addr-line><![CDATA[Torreón Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro Departamento de Ciencias Médico Veterinarias ]]></institution>
<addr-line><![CDATA[Torreón Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2024</year>
</pub-date>
<volume>11</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282024000200024&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282024000200024&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282024000200024&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Resumen El objetivo fue determinar si la presencia de cuernos en carneros define si son de jerarquía alta o baja. Se evaluaron 20 carneros Dorper para determinar su rango social (SR), alto (HSR) o bajo (LSR) en condiciones de manejo intensivo. Al momento de la clasificación del SR, se registraron la presencia (HP) o ausencia (HA) de cuernos y distancia entre los mismos, la altura a la cruz, largo del cuerpo, perímetro torácico, circunferencia escrotal, olor, peso corporal y condición corporal. Posteriormente, se realizó la evaluación seminal, registrando el volumen del eyaculado, la concentración espermática y la motilidad masal. No se presentaron diferencias (p &gt; 0.05) para las variables morfométricas entre los grupos. Sin embargo, la HP así como la calidad seminal, fueron mayores (p &lt; 0.05) en los machos HSR. La presencia de cuernos en los carneros determinó su rango social y los machos dominantes mostraron una mejor calidad seminal que los machos subordinados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Abstract The aim was to determine if the presence of horns on rams defines whether they are high-ranking or low-ranking. Dorper rams (n = 20) were evaluated to determine their social rank (SR), either high (HSR) or low (LSR), under intensive management conditions. Upon SR classification, the morphometric variables horns presence (HP) or absence (HA) and distance between them, the height at the withers, body length, thoracic perimeter, and scrotal circumference, male odor, body weight, and body condition score were registered. Afterward, semen evaluations were performed, recording the ejaculated volume, sperm concentration, and mass motility. There were no differences (p &gt; 0.05) for the morphometric variables between the groups. However, HP as well as semen quality were higher (p &lt; 0.05) in HSR males. The presence of horns in the rams determined their social rank and the dominant males showed better semen quality than the subordinate males.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Social hierarchy]]></kwd>
<kwd lng="en"><![CDATA[social dominance]]></kwd>
<kwd lng="en"><![CDATA[sheep]]></kwd>
<kwd lng="en"><![CDATA[sexual performance]]></kwd>
<kwd lng="en"><![CDATA[reproduction.]]></kwd>
<kwd lng="es"><![CDATA[Jerarquía social]]></kwd>
<kwd lng="es"><![CDATA[dominancia social]]></kwd>
<kwd lng="es"><![CDATA[ovinos]]></kwd>
<kwd lng="es"><![CDATA[desempeño sexual]]></kwd>
<kwd lng="es"><![CDATA[reproducción]]></kwd>
</kwd-group>
</article-meta>
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