<?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>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282017000100081</article-id>
<article-id pub-id-type="doi">10.19136/era.a4n10.971</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Parámetros genéticos para caracteres asociados a la curva de crecimiento de bovinos Tropicarne]]></article-title>
<article-title xml:lang="en"><![CDATA[Genetic parameters for characters associated with the growth curve of Tropicarne cattle]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez-Viveros]]></surname>
<given-names><![CDATA[Joel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Almeida]]></surname>
<given-names><![CDATA[Felipe Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Núñez-Domínguez]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Valverde]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega-Gutiérrez]]></surname>
<given-names><![CDATA[Juan Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Chihuahua Facultad de Zootecnia y Ecología ]]></institution>
<addr-line><![CDATA[Chihuahua Chihuahua]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Zootecnia ]]></institution>
<addr-line><![CDATA[Chapingo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<volume>4</volume>
<numero>10</numero>
<fpage>81</fpage>
<lpage>88</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282017000100081&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282017000100081&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282017000100081&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El objetivo del presente estudio fue estimar parámetros genéticos para el peso adulto (PEA) y tasa de crecimiento (TAC) de bovinos Tropicarne, derivados del modelo no lineal de Brody; así como analizar las posibles relaciones genéticas de estas variables con el peso al destete (PD). Se analizaron 994 datos de PEA (kg) y de TAC (kg-1 mes-1) y 1 506 datos de PD ajustado a 240 d. Los valores promedio y la desviación estándar (±) para PEA, TAC y PD (kg) fueron de 419.1 ± 94.4, 0.0081 ± 0.0039 y 206.8 ± 34.1, respectivamente. El pedigrí se integró por 2 504 individuos. Se realizó un análisis multivariado, a partir de un modelo mixto que consideró como efectos fijos los grupos contemporáneos y la covariable edad de la vaca al parto (lineal y cuadrático); y como aleatorios los efectos genéticos directos y maternos, maternos de ambiente permanente y residuales. Se estimó la heredabilidad directa  y materna , las correlaciones genéticas entre los efectos directos (raa), los maternos (rmm), y los directos con maternos (ram). Las  oscilaron de 0.18 a 0.30, y las  de 0.07 a 0.39; lo cual indica una probable respuesta a la selección en PEA y TAC. Todas las correlaciones genéticas fueron positivas en un intervalo de 0.09 a 0.87, con excepción de r aa entre PEA y TAC (-0.57); este antagonismo genético indica que los individuos con tasas altas de crecimiento no son los de mayor peso adulto.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The aim of this study was to estimate genetic parameters for mature weight (MW) and growth rate (GR) derived from the nonlinear Brody model, and analyze the possible genetic relationships between these variables and weaning weight (WW). The information analyzed was MW (kg; n = 994), GR (kg kg-1 month-1, n = 994), and WW adjusted to 240 d (kg; n = 1506); the mean values and standard deviation (±) for MW, GR and WW were 419.1 ± 94.4, 0.0081 ± 0.0039 and 206.8 ± 34.1, respectively; the pedigree was composed of 2504 records. A multivariate analysis was performed (MW, GR and WW) from a mixed model that included as fixed effects the contemporary groups and the covariate age of the cow at calving (linear and quadratic), and as random ones the direct and maternal, maternal permanent environment, and residual genetic effects. Direct  and maternal  heritability, as well as the genetic correlations between direct (r aa ), maternal (r mm ), and direct with maternal effects (r am ) were estimated. The  varied from 0.18 to 0.30, and the  from 0.07 to 0.39, indicating that there could be a response to the selection in MW and GR. All genetic correlations were positive in an interval of 0.09 to 0.87, except the r aa between MG and GR (-0.57), this genetic antagonism indicates that individuals with high growth rates do not have the highest mature weight.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Correlación genética]]></kwd>
<kwd lng="es"><![CDATA[raza sintética]]></kwd>
<kwd lng="es"><![CDATA[ganadería tropical]]></kwd>
<kwd lng="es"><![CDATA[modelos no lineales]]></kwd>
<kwd lng="es"><![CDATA[heredabilidad.]]></kwd>
<kwd lng="en"><![CDATA[Genetic correlation]]></kwd>
<kwd lng="en"><![CDATA[synthetic breed: tropical livestock]]></kwd>
<kwd lng="en"><![CDATA[nonlinear models]]></kwd>
<kwd lng="en"><![CDATA[heritability]]></kwd>
</kwd-group>
</article-meta>
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