<?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>S2007-11242023000300539</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v14i3.6251</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Parámetros, correlaciones y tendencias genéticas de caracteres reproductivos en ganado Holstein de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Genetic parameters, correlations and trends of reproductive traits in Holstein cattle from Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Durán-Alvarez]]></surname>
<given-names><![CDATA[Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Ruiz]]></surname>
<given-names><![CDATA[Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso Morales]]></surname>
<given-names><![CDATA[Rogelio Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Eguiarte]]></surname>
<given-names><![CDATA[Luis E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-López]]></surname>
<given-names><![CDATA[Felipe de Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Centro Nacional de Investigación Disciplinaria en Fisiología y Mejoramiento Animal ]]></institution>
<addr-line><![CDATA[ Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ecología Departamento de Ecología Evolutiva]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2023</year>
</pub-date>
<volume>14</volume>
<numero>3</numero>
<fpage>539</fpage>
<lpage>555</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242023000300539&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242023000300539&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242023000300539&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo fue calcular los parámetros, correlaciones y describir las tendencias genéticas de caracteres reproductivos en ganado Holstein de México en tres periodos diferentes de tiempo, en hembras nacidas entre 2006 y 2019, usando registros de la asociación Holstein de México. Los parámetros reproductivos calculados fueron: intervalo parto a primer servicio (IPPS), el número de servicios por concepción (NSC), los días abiertos (DAB), el intervalo entre partos (IEP) y la edad al primer parto (EPP). Los componentes de la varianza fueron estimados utilizando máxima verosimilitud restringida en un modelo animal, para calcular parámetros genéticos (heredabilidad en sentido estricto (h2), repetibilidad (r) y correlaciones genéticas) y correlaciones fenotípicas. También se estimaron varianzas genéticas aditivas y valores genéticos en tres periodos de tiempo (P1: 2006-2009, P2: 2010-2013 y P3: 2014-2017). Las heredabilidades calculadas fueron de 4 a 9 % y las repetibilidades del 8 al 9 %, valores cercanos a reportes previos para características de fertilidad. Las correlaciones fenotípicas fueron positivas para casi todos los parámetros reproductivos y las genéticas fueron positivas en un rango amplio (0.13-0.99). Los análisis por periodos mostraron cambios, posiblemente derivados de la influencia de la importación y uso de germoplasma de toros extranjeros (principalmente de los Estados Unido de América y Canadá) que implementan selección genómica e incluyen características fertilidad. La presente investigación ha permitido actualizar la información de parámetros reproductivos y genéticos en caracteres de fertilidad que podrán ser incorporados a las evaluaciones genéticas nacionales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective was to calculate the parameters, correlations and describe the genetic trends of reproductive traits in Holstein cattle from Mexico in three different periods of time, in females born between 2006 and 2019, using records of the Mexican Holstein association. The reproductive parameters calculated were: calving to first insemination interval (CFI), number of services per conception (NSC), days open (DO), interval between calving (IBC), and age at first calving (AFC). The components of variance were estimated using restricted maximum likelihood in an animal model, to calculate genetic parameters (narrow-sense heritability (h2), repeatability (r) and genetic correlations) and phenotypic correlations. Additive genetic variances and genetic values were also estimated in three periods of time (P1: 2006-2009, P2: 2010-2013 and P3: 2014-2017). The calculated heritabilities were from 4 to 9 % and the repeatabilities from 8 to 9 %, values close to previous reports for fertility traits. Phenotypic correlations were positive for almost all reproductive parameters and genetic correlations were positive over a wide range (0.13-0.99). Analyses by period showed changes, possibly derived from the influence of the import and use of germplasm from foreign bulls (mainly from the United States of America and Canada) which implement genomic selection and include fertility traits. The present research has made it possible to update the information on reproductive and genetic parameters in fertility traits that can be incorporated into national genetic evaluations.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Caracteres reproductivos]]></kwd>
<kwd lng="es"><![CDATA[Ganado Holstein]]></kwd>
<kwd lng="es"><![CDATA[Parámetros genéticos]]></kwd>
<kwd lng="es"><![CDATA[Heredabilidad]]></kwd>
<kwd lng="es"><![CDATA[Repetibilidad]]></kwd>
<kwd lng="en"><![CDATA[Reproductive traits]]></kwd>
<kwd lng="en"><![CDATA[Holstein cattle]]></kwd>
<kwd lng="en"><![CDATA[Genetic parameters]]></kwd>
<kwd lng="en"><![CDATA[Heritability]]></kwd>
<kwd lng="en"><![CDATA[Repeatability]]></kwd>
</kwd-group>
</article-meta>
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