<?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>0122-8706</journal-id>
<journal-title><![CDATA[Ciencia y Tecnología Agropecuaria]]></journal-title>
<abbrev-journal-title><![CDATA[Cienc. Tecnol. Agropecuaria]]></abbrev-journal-title>
<issn>0122-8706</issn>
<publisher>
<publisher-name><![CDATA[Corporación Colombiana de Investigación Agropecuaria - Corpoica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-87062020000300011</article-id>
<article-id pub-id-type="doi">10.21930/rcta.vol21_num3_art:1697</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of the genetic group of cows of the Gyr and Holstein breeds on the in vitro production technique of bovine embryos]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto del grupo genético de vacas de las razas Gyr y Holstein sobre la técnica de producción in vitro de embriones bovinos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Narváez]]></surname>
<given-names><![CDATA[Héctor Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Santander  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>21</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-87062020000300011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-87062020000300011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-87062020000300011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The aim of this study was to evaluate the genetic group effect of oocyte donors of the Gyr and Holstein breeds on the performance of the in vitro embryo production technique. Twelve multiparous cows were used, non-lactating, six of the Gyr breed (Bos indicus), and six of the Holstein (Bos taurus) breed. Prior to the implementation of the follicular aspiration technique, the animals were subjected to estrus synchronization through the administration of 3 mg estradiol benzoate (RIC-BE®, Tecnopec Ltda., Brazil) plus the insertion of an ear implant with norgestomet (Crestar®, Intervet, Brazil). Aspiration was performed seven days after the start of the synchronization protocol. The results showed that the cows of the Gyr breed had a higher number of visualized follicles and recovered oocytes, as well as a higher cleavage and blastocyst rate on day 7. These results allow considering that, the application of the in vitro embryo production technique in the Gyr breed offers a better performance in specific parameters in comparison to the Holstein breed.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo del actual estudio fue evaluar el efecto del grupo genético de donadoras de ovocitos de las razas Gyr y Holstein sobre el desempeño en la técnica de producción in vitro de embriones. Se utilizaron 12 vacas multíparas, no lactantes, seis de la raza Gyr (Bos indicus) y seis de la raza Holstein (Bos taurus). Previo a la aplicación de la técnica de aspiración folicular, los animales fueron sometidos a sincronización del estro, mediante la administración de 3 mg de benzoato de estradiol (RIC-BE®, Tecnopec Ltda, Brasil), más la inserción de un implante auricular de norgestomet (Crestar®, Intervet, Brasil). La aspiración fue realizada siete días después del inicio del protocolo de sincronización. Los resultados determinaron que las vacas de la raza Gyr presentaron mayor número de folículos visualizados y de ovocitos recuperados, así como mayor tasa de clivaje y de blastocistos en el día siete. Estos resultados permiten considerar que la aplicación de la técnica de producción in vitro de embriones en la raza Gyr puede presentar mejor desempeño en ciertos parámetros en relación con la Holstein.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Bos indicus]]></kwd>
<kwd lng="en"><![CDATA[Bos taurus]]></kwd>
<kwd lng="en"><![CDATA[follicular aspiration]]></kwd>
<kwd lng="en"><![CDATA[follicular wave]]></kwd>
<kwd lng="en"><![CDATA[reproductive performance]]></kwd>
<kwd lng="es"><![CDATA[aspiración folicular]]></kwd>
<kwd lng="es"><![CDATA[Bos indicus]]></kwd>
<kwd lng="es"><![CDATA[Bos taurus]]></kwd>
<kwd lng="es"><![CDATA[desempeño reproductivo]]></kwd>
<kwd lng="es"><![CDATA[onda folicular]]></kwd>
</kwd-group>
</article-meta>
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