<?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>S2007-11242016000100053</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio morfométrico de los epidídimos durante el desarrollo postnatal de corderos Barbados Blackbelly]]></article-title>
<article-title xml:lang="en"><![CDATA[Morphometric study of the epididymes during the postnatal development in Barbados Blackbelly ram lambs]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Velázquez]]></surname>
<given-names><![CDATA[Anahy Danae]]></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"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Metropolitana Licenciatura en Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[ DF]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<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>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<volume>7</volume>
<numero>1</numero>
<fpage>53</fpage>
<lpage>68</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242016000100053&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242016000100053&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242016000100053&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Para caracterizar el desarrollo de los epidídimos, se castraron corderos Blackbelly al nacimiento y cada tres semanas hasta la 21 (n=4 a 6 por grupo). Se registró el peso de los epidídimos y de las tres regiones anatómicas y se tomaron muestras para morfometría. Se calculó el porcentaje de tejido tubular, el diámetro tubular, el grosor y área de la capa muscular, la altura y área del epitelio, y el diámetro y área de la luz tubular. El mayor crecimiento del epidídimo se observó entre las semanas 9 y 18; la cola comenzó a desarrollarse antes que las otras regiones; el peso de ésta fue mayor entre el nacimiento y la semana 12, pero de la semana 15 a la 21 no difirió de la cabeza. En general, el diámetro tubular, el grosor y área de la capa muscular y el diámetro y área de la luz fueron mayores en la cola. La altura del epitelio fue mayor en la cola hasta la semana 9, pero la situación se invirtió a partir de la semana 12. De acuerdo a lo que se conoce de esta raza, la cola comenzó a desarrollarse antes de aparecer la luz de los túbulos seminíferos y del aumento de las concentraciones de testosterona, mientras que el desarrollo de la cabeza y el cuerpo coincidió con el aumento de la capacidad esteroidogénica y la secreción del fluido tubular. Tales hallazgos sugieren diferentes requerimientos de estimulación endocrina y lumicrina para el desarrollo normal de las diferentes regiones del epidídimo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: To characterize the development of the epididymides, Barbados Blackbelly ram lambs were castrated at birth and every three weeks until wk 21 (n=4 to 6 per group). The individual epididymal weight was recorded; the three anatomical regions (caput, corpus and cauda) of the left epididymis were weighed, and samples taken for morphometric studies. The percentage of tubular tissue was calculated, as well as the tubular diameter, the width and area of the muscular layer, the height and area of the epithelium, and the diameter and area of the tubular lumen. Data were analyzed to determine differences among the anatomical regions and ages. The greatest growth of the whole organ was observed between 9 and 18 wk; the cauda started developing earlier than the other anatomical regions; the cauda was heaviest between birth and wk 12, but from 15 to 21 wk the caput and cauda weights were similar to each other. Overall, tubular diameter, width and area of the muscular layer, and luminal diameter and area were greatest in the cauda epididymidis. The epithelium height was greatest in the cauda until wk 9, but the situation reversed from wk 12 onwards. According to previous information for this breed, cauda started developing before the increase of circulating testosterone concentrations, and before the seminiferous tubule lumen appeared, whilst the caput and corpus development coincided temporally with the increase of testicular steroidogenic capacity and tubular fluid secretion. Such findings suggest differential requirements of endocrine and lumicrine stimulation for the normal development of the various anatomical regions of the epididymis.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Epidídimo]]></kwd>
<kwd lng="es"><![CDATA[Desarrollo sexual]]></kwd>
<kwd lng="es"><![CDATA[Ovinos tropicales]]></kwd>
<kwd lng="es"><![CDATA[Corderos Blackbelly]]></kwd>
<kwd lng="en"><![CDATA[Epididymis]]></kwd>
<kwd lng="en"><![CDATA[Sexual development]]></kwd>
<kwd lng="en"><![CDATA[Tropical sheep]]></kwd>
<kwd lng="en"><![CDATA[Blackbelly lambs]]></kwd>
</kwd-group>
</article-meta>
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