<?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>S2007-11242020000200576</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v11i2.4813</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Análisis genético del desarrollo en peso vivo y tasa de gestación en primer parto en bovinos Brahman de Venezuela]]></article-title>
<article-title xml:lang="en"><![CDATA[Genetic analysis of live weight and pregnancy rate at first calving in Brahman cattle from Venezuela]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palacios-Espinosa]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Verde]]></surname>
<given-names><![CDATA[Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ávila-Serrano]]></surname>
<given-names><![CDATA[Narciso-Ysac]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Menéndez-Buxadera]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California Sur Departamento de Ciencia Animal y Conservación del Hábitat ]]></institution>
<addr-line><![CDATA[La Paz B.C.S]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Ministerio del Poder Popular para Ciencia, Tecnología e Innovación Unidad Territorial Yaracuy ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad del Mar  ]]></institution>
<addr-line><![CDATA[Puerto Escondido Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Córdoba Departamento de Genética ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>11</volume>
<numero>2</numero>
<fpage>576</fpage>
<lpage>589</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242020000200576&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242020000200576&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242020000200576&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El peso vivo (PV) de 2,777 animales (1,377 hembras y 1,400 machos con 53,258 datos individuales entre 30 y 600 días de edad), nacidos entre febrero de 2000 y junio del 2011, se analizaron con un modelo de regresión aleatoria (RA) para estimar los componentes genéticos de (co)varianza a lo largo de la escala edad-sexo. La tasa de gestación (TG) junto con el peso vivo ajustado a 548 días de edad (PA548) se estudiaron mediante un modelo multicaracter (MT) obteniéndose un incremento en los estimados de heredabilidad (h2) para TG respecto al clásico modelo univariado (0.08 ± 0.03 vs 0.11 ± 0.02), aumentando la precisión del valor genético (VG) para TG en 15.7 %. La correlación genética (rg) entre TG y PA548 fue 0.31 ± 0.11. El RA mostró que el PV a través de la edad no puede considerarse como expresión del mismo rasgo en ambos sexos, ya que las rg fueron inferiores a 0.60. El análisis de componentes principales mostró que existen cambios importantes en la forma de crecimiento de los animales en la escala de edad representada en estos datos. Se manifestó un importante dimorfismo de origen genético, estimado como diferencia de los VG de machos y hembras en PV, el cual presenta una relación positiva con los VG de la TG.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The live weight (LW) of 2,777 animals (1,377 females and 1,400 males with 53,258 individual data between 30 and 600 days of age), born between February 2000 and June 2011, was analyzed using a random regression (RR) model to estimate the genetic components of (co)variance throughout the age-sex scale. The pregnancy rate (PR) and the LW adjusted to 548 days of age (WA548) were studied using a multitrait (MT) model, an increase in the heritability (h2) estimates for PR compared to the classical univariate model (0.08 ± 0.03 vs. 0.11 ± 0.02) was observed, increasing the accuracy of the genetic value (GV) for PR in 15.7 %. The genetic correlation (rg) between the PR and the WA548 was 0.31 ± 0.11. The RR showed that, through time, the LW could not be considered as an expression of the same trait in both sexes, as the rg were less than 0.60. The principal component analysis showed that there are important changes in the animal growth on the age scale represented in these data. A prominent dimorphism of genetic origin manifested, estimated as the difference between the male and female GVs in LW, which shows a positive relationship with the GVs of PR.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Heredabilidad]]></kwd>
<kwd lng="es"><![CDATA[Correlaciones genéticas]]></kwd>
<kwd lng="es"><![CDATA[Modelos multivariados]]></kwd>
<kwd lng="es"><![CDATA[Regresión aleatoria]]></kwd>
<kwd lng="es"><![CDATA[Dimorfismo sexual]]></kwd>
<kwd lng="en"><![CDATA[Heritability]]></kwd>
<kwd lng="en"><![CDATA[Genetic correlations]]></kwd>
<kwd lng="en"><![CDATA[Multitrait model]]></kwd>
<kwd lng="en"><![CDATA[Random regression model]]></kwd>
<kwd lng="en"><![CDATA[Sexual dimorphism]]></kwd>
</kwd-group>
</article-meta>
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