<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952016000400441</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Edad a la pubertad en corderas pelibuey, hijas de ovejas con actividad reproductiva estacional o continua, nacidas fuera de temporada]]></article-title>
<article-title xml:lang="en"><![CDATA[Puberty age in pelibuey ewes lambs, daughters of ewes with seasonal or continuous reproductive activity, born out of season]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Roldán-Roldán]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Martínez]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Río-Araiza]]></surname>
<given-names><![CDATA[Víctor Del]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Berruecos-Villalobos]]></surname>
<given-names><![CDATA[José M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zarco-Quintero]]></surname>
<given-names><![CDATA[Luis A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valencia]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Veterinaria y Zootecnia Departamentos de Reproducción]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Veterinaria y Zootecnia Genética y Estadística]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>50</volume>
<numero>4</numero>
<fpage>441</fpage>
<lpage>448</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952016000400441&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952016000400441&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952016000400441&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Algunas ovejas Pelibuey no presentan la estacionalidad reproductiva común en la especie. El objetivo de este estudio fue determinar si las corderas Pelibuey, hijas de ovejas con actividad reproductiva continua (C), inician la pubertad antes que las hijas de ovejas estacionales (E), cuando los partos ocurrieron fuera de temporada (otoño o invierno). Las corderas hijas de hembras continuas no se basan en el fotoperiodo e inician su pubertad durante el anestro. Para probar esto, 16 corderas Pelibuey (8C y 8E) nacidas en otoño (noviembre) y 21 corderas (11C y 10E) nacidas en invierno (diciembre-enero) fueron estudiadas. Todas fueron mantenidas con sus madres y destetadas a los 90 d de edad, permanecieron en un sistema intensivo y fueron aisladas del contacto de machos. Desde los cuatro meses de edad, cada semana se registró el peso y la condición corporal y se tomaron muestras sanguíneas para determinar las concentraciones plasmáticas de progesterona e identificar el inicio de la actividad ovárica. Mediante análisis de varianza se estudiaron las diferencias en la presentación de la pubertad entre hijas de hembras continuas y estacionales, en cada época de parición, mediante edad, peso, condición corporal a la primera ovulación y el diferencial del peso al destete-peso a la primera ovulación. La edad y el peso a la pubertad fue 239.25±10.96 d y 29.78±4.39 kg en las corderas nacidas en otoño y 230.28±42.71 d y 25±4.42 kg en las corderas nacidas en invierno. Ninguna variable de las hijas de ovejas continuas fue diferente al de las hijas de estacionales en ninguna de las temporadas de parición (p&gt;0.05). La edad a la pubertad en corderas Pelibuey es independiente del patrón reproductivo estacional o continuo de sus madres. Algunas corderas sólo necesitan exponerse a días largos para que la pubertad ocurra.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Some Pelibuey sheep do not present a reproductive seasonality that is common in the species. The objective of this study was to determine whether the Pelibuey ewe lambs, daughters of ewes with continuous (C) reproductive activity, begin puberty before the daughters of seasonal ewes (S), when the births occurred outside of season (autumn or winter). The ewe lambs daughters of continuous ewes do not rely on the photoperiod and begin their puberty during the anestrus. To test this, 16 Pelibuey ewe lambs (8C and 8S) born in autumn (November) and 21 ewe lambs (11C and 10S) born in the winter (December-January) were studied. All of them were kept with their mothers and weaned at 90 d of age; they remained in an intensive system and were isolated from contact with males. Starting at four months of age, the weight and body condition were recorded weekly, and blood samples were taken to determine the plasma concentrations of progesterone and to identify the beginning of the ovary activity. Through a variance analysis, the differences in the presentation of puberty between daughters of continuous and seasonal ewes were studied, in each birthing season, through age, weight, body condition at first ovulation, and differential of weight at weaning-weight at first ovulation. The age and weight at puberty was 239.25± 10.96 d and 29.78± 4.39 kg in the ewe lambs born in autumn, and 230.28± 42.71 d and 25± 4.42 kg in ewe lambs born in winter. None of the variables of the daughters of continuous ewes were different from those of seasonal daughters in any of the lambing seasons (p&gt; 0.05). The age at puberty in Pelibuey lambs is independent of the reproductive pattern, seasonal or continuous, of their mothers. Some ewe lambs only need to be exposed to long days for puberty to take place.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Pubertad]]></kwd>
<kwd lng="es"><![CDATA[corderas]]></kwd>
<kwd lng="es"><![CDATA[Pelibuey]]></kwd>
<kwd lng="es"><![CDATA[fotoperiodo]]></kwd>
<kwd lng="es"><![CDATA[actividad reproductiva continua]]></kwd>
<kwd lng="es"><![CDATA[Ovis atries]]></kwd>
<kwd lng="en"><![CDATA[Puberty]]></kwd>
<kwd lng="en"><![CDATA[lambs]]></kwd>
<kwd lng="en"><![CDATA[Pelibuey]]></kwd>
<kwd lng="en"><![CDATA[photoperiod]]></kwd>
<kwd lng="en"><![CDATA[continuous reproductive activity]]></kwd>
<kwd lng="en"><![CDATA[Ovis aries]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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