<?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>2007-1124</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. pecuarias]]></abbrev-journal-title>
<issn>2007-1124</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11242016000300341</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Desarrollo del eje reproductivo endocrino en corderos de pelo]]></article-title>
<article-title xml:lang="en"><![CDATA[Development of the endocrine reproductive axis in hair breed ram lambs]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montiel-Olguín]]></surname>
<given-names><![CDATA[Luis Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vera-Ávila]]></surname>
<given-names><![CDATA[Héctor Raymundo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villagómez-Amezcua]]></surname>
<given-names><![CDATA[Eugenio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castañeda-Rodríguez]]></surname>
<given-names><![CDATA[Vicente]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cárdenas-León]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Severiano]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,INIFAP Centro Nacional de Investigación Disciplinaria en Fisiología y Mejoramiento Animal ]]></institution>
<addr-line><![CDATA[Ajuchitlán Querétaro]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UNAM FES Cuautitlán Posgrado en Ciencias de la Producción y de la Salud Animal]]></institution>
<addr-line><![CDATA[Cuautitlán Izcalli Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,INIFAP Centro Nacional de Investigación Disciplinaria en Microbiología Animal ]]></institution>
<addr-line><![CDATA[Cuajimalpa DF]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán  ]]></institution>
<addr-line><![CDATA[Tlalpan DF]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<volume>7</volume>
<numero>3</numero>
<fpage>341</fpage>
<lpage>360</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242016000300341&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242016000300341&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242016000300341&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los objetivos fueron caracterizar los perfiles de LH y testosterona (T) y la respuesta a GnRH en corderos de pelo. Estudio 1: se utilizaron corderos Blackbelly (n=4), Pelibuey (n=5), Blackbelly x Pelibuey (Cruzas; n=8). A las 2, 4, 8, 12, 16, 20 y 24 semanas de edad, se obtuvieron muestras de sangre cada 15 min durante 6 h, para caracterizar los perfiles de LH y T. No hubo diferencia entre genotipos a ninguna edad, para ninguna variable de LH y T (P&gt;0.05); el efecto de la edad fue significativo (P&lt;0.05): la concentración promedio de LH fue menor en la semana 2 (P&lt;0.05), alcanzó el valor más alto en la 12, y disminuyó en la 16 (P&lt;0.05). La concentración promedio de T aumentó constantemente entre 2 y 24 semanas (P&lt;0.05). Estudio 2: se utilizaron corderos Blackbelly (n=4), Pelibuey (n=4), Cruzas (n=4). A las mismas edades, los corderos se desafiaron con GnRH (3, 9, 27 ng&#8226;kg-1 peso) y se obtuvieron muestras de sangre entre - 15 y 180 min. En las semanas 8 y 12, la respuesta de LH fue mayor en los corderos Pelibuey, en comparación con Blackbelly. La respuesta de T tendió a ser diferente entre genotipos (P&lt;0.10), con Blackbelly mostrando la menor respuesta. En conclusión, el desarrollo de los perfiles de LH y T no fue diferente entre genotipos, pero los corderos Pelibuey presentaron mayor capacidad de respuesta a GnRH en las semanas 8 y 12; es necesario determinar si estas diferencias tienen implicaciones sobre la capacidad reproductiva de los animales adultos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objectives were to characterize the profiles of LH and testosterone (T) and the response to GnRH administration in hair ram lambs. Study 1: seventeen lambs were used: Blackbelly (n=4), Pelibuey (n=5), Blackbelly x Pelibuey (Crossbred; n=8). At 2, 4, 8, 12, 16, 20 and 24 wk of age, blood samples were collected every 15 min for 6 h, to characterize LH and T profiles. There was no significant difference between genotypes at any age, for any variable of LH and T profiles (P&gt;0.05). The effect of age was significant (P&lt;0.05): mean LH concentration was lower on wk 2 (P&lt;0.05), achieved the highest value on wk 12, and decreased on wk 16 (P&lt;0.05). Mean T concentration increased steadily between wk 2 and 24 (P&lt;0.05). Study 2: twelve lambs were used: Blackbelly (n=4), Pelibuey (n=4), Crossbred (n=4). At the same ages, lambs were challenged with GnRH (3, 9, 27 ng&#8226;kg-1 BW) and blood samples were obtained between -15 and 180 min from GnRH administration. On wk 8 and 12, LH response to GnRH was greater in Pelibuey, as compared with Blackbelly. Testosterone response tended to be different between genotypes (P&lt;0.10), with Blackbelly showing the smallest response. In conclusion, the sexual endocrine development, as evaluated by the non-stimulated LH and T profiles, was not different among genotypes; however, Pelibuey elicited the greatest responsiveness to GnRH administration at 8 and 12 wk of age. Whether or not such differences have implications on the reproductive capacity of the adult animals deserves additional research.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Blackbelly]]></kwd>
<kwd lng="es"><![CDATA[Pelibuey]]></kwd>
<kwd lng="es"><![CDATA[LH]]></kwd>
<kwd lng="es"><![CDATA[Testosterona]]></kwd>
<kwd lng="es"><![CDATA[Desarrollo sexual]]></kwd>
<kwd lng="en"><![CDATA[Blackbelly]]></kwd>
<kwd lng="en"><![CDATA[Pelibuey]]></kwd>
<kwd lng="en"><![CDATA[LH]]></kwd>
<kwd lng="en"><![CDATA[Testosterone]]></kwd>
<kwd lng="en"><![CDATA[Sexual development]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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