<?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>S2007-11242023000200326</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v14i2.6031</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Factores que afectan la tasa de preñez mediante transferencias de embriones por fertilización in vitro en novillas multirraciales en condiciones de trópico colombiano]]></article-title>
<article-title xml:lang="en"><![CDATA[Factors affecting the rate of pregnancy by embryo transfers (ET) by in vitro fertilization in multibreed heifers under Colombian tropical conditions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valencia Ocampo]]></surname>
<given-names><![CDATA[Heli Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Colorado]]></surname>
<given-names><![CDATA[Nancy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mantilla]]></surname>
<given-names><![CDATA[Tatiana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Francisco de Paula Santander Ocaña Facultad de Ciencias Agrarias y del Ambiente ]]></institution>
<addr-line><![CDATA[Ocaña ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<volume>14</volume>
<numero>2</numero>
<fpage>326</fpage>
<lpage>338</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242023000200326&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242023000200326&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242023000200326&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La transferencia de embriones (TE) es considerada actualmente como una herramienta biotecnológica con gran importancia para multiplicar y obtener individuos con potencialidades productivas y alto mérito genético. El objetivo de este estudio fue determinar la influencia de factores como ITH, tamaño del CL, estado de desarrollo del embrión y peso sobre la tasa de preñez mediante transferencia de embriones por fertilización in vitro en novillas multirraciales. Se seleccionaron 840 novillas como receptoras, con edades promedio de 3 años, un peso de 346.5 ± 33.4 kg de peso vivo, a las cuales se les aplicó un protocolo de sincronización para TE, previo registro del estadio del embrión, seguimiento ecográfico y se realizó el monitoreo de variables medioambientales. La información se analizó mediante un modelo de regresión logística para determinar la correlación entre las variables independientes sobre la variable dicotómica de respuesta tasa de preñez. Se determinó la influencia del tamaño del cuerpo lúteo (CL) dado las diferencias significativas (P&lt;0.05) en los tamaños de CL1 y CL2. También, se encontró diferencias (P&lt;0.05) con los estadios de BL y BX. En contraste, no se encontró diferencias estadísticas (P&gt;0.05) en las demás variables. El presente estudio evidenció el impacto del tamaño del CL y el desarrollo del embrión en el éxito de la técnica de TE.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Embryo transfer (ET) is currently considered a biotechnological tool with great importance to multiply and obtain individuals with productive potential and high genetic merit. The objective of this study was to determine the influence of factors such as THI, CL size, embryo development status and weight on the rate of pregnancy by embryo transfer by in vitro fertilization in multibreed heifers. Eight hundred forty heifers were selected as recipients, with an average age of 3 years, a weight of 346.5 ± 33.4 kg of live weight, to which a synchronization protocol for ET was applied, after recording the stage of the embryo, ultrasound monitoring and the environmental variables were monitored. The information was analyzed using a logistic regression model to determine the correlation between the independent variables and the dichotomous response variable pregnancy rate. The influence of corpus luteum (CL) size was determined given the significant differences (P&lt;0.05) in the sizes of CL1 and CL2. Differences (P&lt;0.05) were also found with the stages of BL and BX. In contrast, no statistical differences (P&gt;0.05) were found in the other variables. The present study showed the impact of CL size and embryo development on the success of the ET technique.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Transferencia de embriones]]></kwd>
<kwd lng="es"><![CDATA[Índice temperatura humedad (ITH)]]></kwd>
<kwd lng="es"><![CDATA[Fertilización in vitro]]></kwd>
<kwd lng="es"><![CDATA[Cuerpo lúteo (CL)]]></kwd>
<kwd lng="en"><![CDATA[Embryo transfer]]></kwd>
<kwd lng="en"><![CDATA[Humidity-temperature index (THI)]]></kwd>
<kwd lng="en"><![CDATA[In vitro fertilization]]></kwd>
<kwd lng="en"><![CDATA[Corpus luteum (CL)]]></kwd>
</kwd-group>
</article-meta>
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