<?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>2007-0705</journal-id>
<journal-title><![CDATA[Nova scientia]]></journal-title>
<abbrev-journal-title><![CDATA[Nova scientia]]></abbrev-journal-title>
<issn>2007-0705</issn>
<publisher>
<publisher-name><![CDATA[Universidad de La Salle Bajío A. C., Coordinación de Investigación]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-07052017000200372</article-id>
<article-id pub-id-type="doi">10.21640/ns.v9i19.1028</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Polimorfismos del gen ob en bovinos de raza holstein en la Comarca Lagunera, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Ob Gene Polymorphisms in Holstein Cattle at Comarca Lagunera, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Retana]]></surname>
<given-names><![CDATA[Sarai S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gallegos-Robles]]></surname>
<given-names><![CDATA[Miguel A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Salas]]></surname>
<given-names><![CDATA[Uriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Hernández]]></surname>
<given-names><![CDATA[José L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fortis-Hernández]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Vázquez]]></surname>
<given-names><![CDATA[Cirilo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trejo-Escareño]]></surname>
<given-names><![CDATA[Héctor I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Juárez del Estado de Durango Facultad de Agricultura y Zootecnia ]]></institution>
<addr-line><![CDATA[Gómez Palacio Durango]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Juárez del Estado de Durango Facultad de Agricultura y Zootecnia ]]></institution>
<addr-line><![CDATA[Gómez Palacio Durango]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Tecnológico de Torreón  ]]></institution>
<addr-line><![CDATA[Torreón Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>9</volume>
<numero>19</numero>
<fpage>372</fpage>
<lpage>392</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-07052017000200372&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-07052017000200372&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-07052017000200372&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La Comarca Lagunera es la cuenca lechera más importante de México. En la actualidad se están utilizando diversas técnicas que permiten evaluar genéticamente el animal a una edad temprana, permitiendo seleccionar futuros reproductores con características deseables. Entre los genes relacionados con la producción de leche, se encuentran el gen Ob también llamado gen Leptina el cual actúa sobre el sistema nervioso central y tejidos periféricos jugando un papel muy importante en la modulación regulación del apetito, ganancia de peso vivo, incremento del metabolismo energético y el anabolismo muscular. Este trabajo se realizó para determinar el polimorfismo de longitud del fragmento de restricción ACI I de gen leptina en el exón 2 y correlacionarlo con los parámetros de producción y calidad de leche. Se recolectaron 100 muestra de sangre de vacas en producción del establo &#8220;Lácteos Florida&#8221; de Francisco I. Madero municipio de Coahuila, México con tres estatus de producción: altas, medias y bajas La extracción de ADN se realizó por el método modificado de Salting-Out. Se realizó PCR del gen leptina originando un fragmento de 272 bp de longitud y se realizó PCR-RFLP con la enzima de restricción ACI I y secuenciación, correlacionando los genotipos TT, CT Y CC con tres estatus de producción de leche: altas, medias, bajas. El análisis estadístico indicó que las vacas portadoras del genotipo homocigoto (TT) tienen un efecto significativo (P&lt;0.01) con respecto a las características de producción y calidad de leche ya que tuvieron un mayor consumo de alimento, ganancia de peso, además de una elevada producción de leche en comparación a los genotipos heterocigoto (CT) y homocigoto (CC). Los resultados obtenidos muestran que la identificación molecular de polimorfismos del gen Ob puede usarse como herramienta de selección genética en bovinos de raza Holstein.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The Laguna Region is the most important dairy region of Mexico. Currently are using various techniques to genetically evaluate the animal at an early age, allowing to select future breeding with desirable characteristics. Among related genes to milk production, are the Ob gene also called Leptin gene which acts on the central nervous system and peripheral tissues playing an important role in regulating modulation of appetite, body weight gain, increased metabolism energy and muscle anabolism. This study was performed to determine polymorphism restriction fragment length ACI I of Leptin gene in exon 2 and correlate it with the production parameters and milk quality. Blood sample of one hundred cows were collected on the dairy farm "Lacteos Florida" Francisco I. Madero municipality of Coahuila, Mexico with three status of milk production: high, medium and low. DNA extraction was performed by the modified method of Salting-Out. PCR of leptin gene was performed resulting in a fragment of 272 bp in length and was subjected to PCR-RFLP with the ACI I restriction enzyme and sequencing, correlating TT, CT and CC genotypes with groups of cows sampled high, medium, low producers respectively. Statistical analysis indicated that cows carrier the homozygous genotype (TT) have a significant effect (P &lt;0.01) with respect to the characteristics of production and quality of milk since they had a higher feed intake, weight gain, and a high milk production compared to heterozygote (CT) and homozygote (CC) genotypes. The results show that molecular identification of Ob gene polymorphisms can be used as a tool for genetic selection in Holstein cattle.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[leptina]]></kwd>
<kwd lng="es"><![CDATA[genotipos]]></kwd>
<kwd lng="es"><![CDATA[calidad]]></kwd>
<kwd lng="es"><![CDATA[producción de leche]]></kwd>
<kwd lng="en"><![CDATA[leptin]]></kwd>
<kwd lng="en"><![CDATA[genotypes]]></kwd>
<kwd lng="en"><![CDATA[quality]]></kwd>
<kwd lng="en"><![CDATA[milk production]]></kwd>
</kwd-group>
</article-meta>
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