<?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>S2007-11242025000200455</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v16i2.6715</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tasa de gestación y pérdida gestacional temprana en vacas receptoras de embriones y hemi-embriones vitrificados producidos in vitro]]></article-title>
<article-title xml:lang="en"><![CDATA[Pregnancy and early pregnancy loss rates in cows receiving in vitro-produced vitrified embryos and hemi-embryos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Mercado]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Canseco-Sedano]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vega-Murillo]]></surname>
<given-names><![CDATA[Vicente Eliezer]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lepe-Anasagasti]]></surname>
<given-names><![CDATA[Itziar Eukene]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras-Hernández]]></surname>
<given-names><![CDATA[Gustavo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zárate-Guevara]]></surname>
<given-names><![CDATA[Oscar Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Veracruzana Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Veracruz Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<volume>16</volume>
<numero>2</numero>
<fpage>455</fpage>
<lpage>464</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242025000200455&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242025000200455&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242025000200455&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo fue comparar la tasa de gestación y de pérdida gestacional temprana (60 días pos transferencia) utilizando embriones y hemi-embriones bovinos vitrificados producidos in vitro. Se utilizaron 60 blastocistos bovinos de calidad 1, que fueron distribuidos al azar en dos tratamientos, (1) embriones enteros vitrificados (n= 30) y (2) embriones bipartidos (hemi-embriones) vitrificados (n= 30). Los embriones enteros y hemi-embriones fueron vitrificados, almacenados, calentados y transferidos a 60 receptoras. El diagnóstico de gestación se realizó por ultrasonografía transrectal a los 30 días, y a los 60 días se determinó la pérdida gestacional. Las tasas de gestación y pérdidas gestacionales se analizaron como variables binomiales (0= no gestante; 1= gestante) y comparadas con la prueba exacta de Fisher con el programa SAS. El porcentaje de gestación y pérdida gestacional de embriones sometidos a bipartición fue similar a los embriones enteros, por lo que se puede concluir que la bipartición en embriones in vitro previo a la vitrificación, no beneficia el porcentaje de gestación, ni afecta las pérdidas gestacionales en los primeros dos meses de gestación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Bovine embryo bisection and vitrification protocols can affect pregnancy and early pregnancy loss rates. It was compared pregnancy rates at 30 d post-transfer and early pregnancy loss rates at 60 d post-transfer using in vitro-produced vitrified bovine embryos and hemi-embryos. Sixty (60), grade 1 bovine blastocysts were randomly distributed into two treatments: (1) Vitrified whole embryos (n= 30), and (2) vitrified bisected embryos (hemi-embryos) (n= 30). Embryo bisection was done prior to vitrification. Whole embryos and hemi-embryos were vitrified, stored, thawed, and transferred to 60 recipients. Pregnancy was diagnosed by transrectal ultrasound at 30 d post-transfer, and pregnancy loss measured at 60 d. Pregnancy and pregnancy loss rates were analyzed as binomial variables (0= not pregnant; 1= pregnant) and compared using Fisher&#8217;s exact test. Neither rate differed between the hemi-embryos and whole embryos. Pre-vitrification bisection of in vitro-produced embryos affects neither pregnancy rate nor early pregnancy loss rate. This technique simplifies the transfer process because it removes the need for in-field bisection.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Bovinos]]></kwd>
<kwd lng="es"><![CDATA[Criopreservación]]></kwd>
<kwd lng="es"><![CDATA[Bipartición]]></kwd>
<kwd lng="en"><![CDATA[Bovines]]></kwd>
<kwd lng="en"><![CDATA[Cryopreservation]]></kwd>
<kwd lng="en"><![CDATA[Bisection]]></kwd>
</kwd-group>
</article-meta>
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