<?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>S2007-11242015000400393</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Gestación en vacas lecheras con dos protocolos de sincronización de la ovulación e inseminación a tiempo fijo]]></article-title>
<article-title xml:lang="en"><![CDATA[Pregnancy in dairy cows with two protocols for synchronization of ovulation and timed artificial insemination]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores Domínguez]]></surname>
<given-names><![CDATA[Silvano]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñoz Flores]]></surname>
<given-names><![CDATA[Luis Ramón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Ordaz]]></surname>
<given-names><![CDATA[Reyes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aréchiga Flores]]></surname>
<given-names><![CDATA[Carlos Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mapes]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Cerón]]></surname>
<given-names><![CDATA[Joel]]></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 ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Metropolitana Unidad Xochimilco División de Ciencias Biológicas y de la Salud]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Zacatecas Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Ceva Salud Animal  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>6</volume>
<numero>4</numero>
<fpage>393</fpage>
<lpage>404</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242015000400393&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242015000400393&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242015000400393&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se comparó la tasa de gestación (TG) en vacas lecheras inseminadas a tiempo fijo mediante dos protocolos. El día 32 posparto, 275 vacas recibieron dos inyecciones de PGF2&#945; con intervalo de 14 días. Doce días después de la segunda inyección, se asignaron a los siguientes tratamientos: 1) Ovsynch (n=144) recibieron GnRH; siete días después PGF2&#945;; 56 h más tarde GnRH y se inseminaron 16 h después 2) PRID5d (n=131) recibieron GnRH y un dispositivo intravaginal liberador de progesterona durante cinco días; al retirar el dispositivo, se aplicaron dos inyecciones de PGF2&#945; con intervalo de 24 h; 56 h posterior al retiro del dispositivo, se aplicó GnRH y se inseminaron 16 h después. La gestación se diagnosticó por palpación rectal el día 45 posinseminación. Se comparó la TG mediante regresión logística. Las variables independientes fueron: tratamiento (Ovsynch vs PRID5d), producción láctea (&#8804;40 vs &gt;40 kg), técnico inseminador (1 vs 2), tipo de puerperio (normal vs anormal), partos previos (primíparas vs multíparas) y si mostraron estro en la presincronización. La TG fue similar (P&gt;0.1) entre los tratamientos (27 vs 21 %; Ovsynch y PRID5d, respectivamente). Ninguna de las otras variables independientes afectó la TG (P&gt;0.1); no hubo efecto de la interacción de dichas variables con el tratamiento en la TG (P&gt;0.1). Se concluye que la TG fue similar entre las vacas inseminadas con un protocolo Ovsynch o mediante un protocolo Ovsynch modificado que incluyó 5 días de progesterona y la reducción de 7 a 5 días entre la inyección de GnRH y la PGF2&#945;.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The objective was to compare the pregnancy rate (PR) between two timed AI protocols in dairy cattle. Two hundred seventy-five (275) cows were presynchronized with PGF2&#945; given 14 d apart beginning at d 32 postpartum; 12 d after second PGF2&#945;, cows were assigned to two treatments: 1) Ovsynch (n=144) received GnRH, followed 7 d later by PGF2&#945; and then GnRH 56 h after PGF2&#945; and cows were inseminated 16 h later 2) PRID5d (n=131), received GnRH and a progesterone-releasing intravaginal device, which remained in place 5 d. Cows received an injection of PGF2&#945; at the time of progesterone device removal and a second injection of PGF2&#945; 24 h later. At 56 h following progesterone device removal, the next injection of GnRH was given and cows were inseminated 16 h later. Pregnancy diagnosis was performed 45 d after AI by transrectal palpation. PR was compared by logistic regression analysis. Independent variables were: treatment (Ovsynch vs PRID5d), milk yield (&#8804;40 vs &gt;40 kg), technician (1 vs 2), puerperium (normal vs abnormal), parity (primiparous vs multiparous) and standing estrus during presynchronization. PR was similar (P&gt;0.1) between treatments (27 vs 21 %; Ovsynch and PRID5d, respectively). There was no effect of the other independent variables on PR. The interaction of these variables with the treatment did not affect PR (P&gt;0.1). In conclusion, PR was similar in dairy cows inseminated by an Ovsynch protocol or through modified Ovsynch which included progesterone during 5 d and reduction of the interval between the GnRH and PGF2&#945; from 7 to 5 d.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ovsynch]]></kwd>
<kwd lng="es"><![CDATA[Progesterona]]></kwd>
<kwd lng="es"><![CDATA[Fertilidad]]></kwd>
<kwd lng="es"><![CDATA[Vacas lecheras]]></kwd>
<kwd lng="en"><![CDATA[Ovsynch]]></kwd>
<kwd lng="en"><![CDATA[Progesterone]]></kwd>
<kwd lng="en"><![CDATA[Fertility]]></kwd>
<kwd lng="en"><![CDATA[Dairy cows]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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