<?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>S2007-11242024000400800</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v15i4.6628</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Modelo de predicción para la extensión de la vida productiva en registros censurados de ganado Holstein de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Prediction model for productive life extension in censored records of Holstein cattle from Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Núñez-Soto]]></surname>
<given-names><![CDATA[Sandra Giovanna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</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[Toledo Alvarado]]></surname>
<given-names><![CDATA[Hugo Oswaldo]]></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 Facultad de Medicina Veterinaria y Zootecnia Programa de Maestría y Doctorado en Ciencias de la Producción y de la Salud Animal]]></institution>
<addr-line><![CDATA[México D.F]]></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 Departamento de Genética y Bioestadística]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>15</volume>
<numero>4</numero>
<fpage>800</fpage>
<lpage>810</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242024000400800&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242024000400800&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242024000400800&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de este estudio fue predecir los meses en producción a los 84 meses de edad (MEP84) para incluir información de animales aún vivos en la evaluación genética de longevidad a partir de información productiva y reproductiva para establecer la longevidad completa como MEP84. Los registros se obtuvieron de animales nacidos entre 1986 y 2020 de la asociación Holstein de México. Para predecir MEP84, se ajustó un modelo de regresión lineal para el 1er parto, al 2do, al 3º, al 4º y al 5º parto antes de 84 meses de edad. El modelo incluyó información de las vacas con longevidades completas como la producción de leche en kilogramos ajustada a 305 días EM (PE) en el parto actual, los meses en producción acumulados previos al parto actual (MACL), los meses en producción en el parto actual (MLPA), el índice de gestación en el parto actual (IDG), el índice del estado de la lactación en el parto actual (EDL) y la edad al primer parto en meses (EPP) en su efecto lineal y cuadrático (EPP2). El modelo explicó del 44 al 98 % de la variación observada en MEP84. La mayoría de los coeficientes de regresión para expandir las longevidades fueron significativos y positivos (P&lt;0.01). La media del coeficiente para IDG fue negativo en todos los partos (-0.7159 ± 0.0171 y -2.0632 ± 0.0732). El modelo propuesto permitió incluir a vacas que aún no terminan su vida productiva, siendo de interés en las evaluaciones genéticas de longevidad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of this study was to predict months in production at 84 mo of age (MIP84) to include information from still-living animals in the genetic evaluation of longevity based on productive and reproductive information to establish complete longevity as MIP84. The records were obtained from animals born between 1986 and 2020 from the Holstein Association of Mexico. To predict MIP84, a linear regression model was fitted for 1st, 2nd, 3rd, 4th, and 5th calving before 84 mo of age. The model included information from cows with complete longevity, such as milk production in kilograms adjusted to 305 d ME (SP) at current calving, cumulative months in production before current calving (MACL), months in production at current calving (MLCC), pregnancy index at current calving (PRI), lactation status index at current calving (LAS), and age at first calving in months (AFC) in its linear and quadratic effects (AFC2). The model explained 44 to 98 % of the variation observed in MIP84. Most regression coefficients for expanding longevity were significant and positive (P&lt;0.01). The mean coefficient for PRI was negative in all calving&#8217;s (-0.7159 ± 0.0171 and -2.0632 ± 0.0732). The proposed model allowed the inclusion of cows that have not yet finished their productive life, being of interest in genetic longevity assessments.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Modelo de predicción]]></kwd>
<kwd lng="es"><![CDATA[Longevidad]]></kwd>
<kwd lng="es"><![CDATA[Vacas Holstein]]></kwd>
<kwd lng="en"><![CDATA[Prediction model]]></kwd>
<kwd lng="en"><![CDATA[Longevity]]></kwd>
<kwd lng="en"><![CDATA[Holstein cows]]></kwd>
</kwd-group>
</article-meta>
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