<?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>2224-7920</journal-id>
<journal-title><![CDATA[Revista de Producción Animal]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. prod. anim.]]></abbrev-journal-title>
<issn>2224-7920</issn>
<publisher>
<publisher-name><![CDATA[Ediciones Universidad de Camagüey]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2224-79202021000200014</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Parámetros genéticos para rasgos de crecimiento de animales Santa Gertrudis en pruebas de comportamiento]]></article-title>
<article-title xml:lang="en"><![CDATA[Genetics parameters for growth traits in animals of the Santa Gertrudis breed subjected to performance tests]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez Tronco]]></surname>
<given-names><![CDATA[Marco Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Castro]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerra Rojas]]></surname>
<given-names><![CDATA[María del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Gutiérrez]]></surname>
<given-names><![CDATA[María Segunda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Agraria de La Habana (UNAH)  ]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigaciones para el Mejoramiento Animal de la Ganadería Tropical (CIMAGT)  ]]></institution>
<addr-line><![CDATA[Loma de Tierra, Cotorro La Habana]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2021</year>
</pub-date>
<volume>33</volume>
<numero>2</numero>
<fpage>14</fpage>
<lpage>25</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2224-79202021000200014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2224-79202021000200014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2224-79202021000200014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Antecedentes:  Los parámetros genéticos son fundamentales para programas de mejoramiento genético. Objetivo. Estimar los parámetros genéticos para rasgos de crecimiento en la raza Santa Gertrudis evaluadas en animales sometidos a pruebas de comportamiento (PC).  Métodos:  Se empleó una base de datos integrada por 4 607 registros de tres Empresas Genéticas entre los años 1981-2016. Los rasgos estudiados fueron: peso al nacer (PN), peso al destete (PD), peso final ajustado a 540 días de edad (PF), ganancia media diaria (GMD) y peso por edad (PPE). Los grupos contemporáneos se conformaron a partir de la combinación rebaño, año y época de nacimiento (cuatrimestre), con no menos de tres animales. Se estimaron los componentes de (co)varianza para modelos unicarácter y multicaracter y los parámetros genéticos se estimaron usando el software MTDFREML.  Resultados:  Las h2 estimadas fueron: 0,08 ± 0,02; 0,18 ± 0,02; 0,28 ± 0,07; 0,05 ± 0,02 y 0,26 ± 0,07 para PN, PD, PF, GMD y PPE, respectivamente. Las correlaciones genéticas fueron todas positivas excepto entre PN y GMD (-0,11) y las restantes oscilaron entre 0,10 (PN y PPE) y 0,98 (PD y PF; PF y GMD). Las correlaciones fenotípicas fueron más bajas que las genéticas.  Conclusiones:  El PF en PC que es el criterio de selección principal presenta la h2 mayor y tiene correlaciones genéticas positivas con los demás caracteres por lo que se debe esperar la mejora simultanea de todos. El PF, GMD y PPE están determinados por los mismos genes aditivos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Background: The genetic parameters are necessary in order to formulate optimal genetic improvement programs. Objective. To determine the genetic parameters for growth traits in animals subjected to performance tests (PT) of the Santa Gertrudis breed.  Methods: A database made up of 4,607 records of animals belonged to three genetic enterprises between years 1981-2016. The traits studied were: birth weight (BW), weaning weight (WW), final weight in the adjusted to 540 days of age (FWA), mean daily gain (ADG) and weight for age (WA). The groups of contemporaries were made up of the combination of herd, year and season of birth (four-month period), with no less than 3 animals. Variance and covariance components and genetic parameters were estimated using the restricted maximum likelihood (REML) procedure and the derivative-free algorithm using the MTDFREML software.  Results:  Heritabilities were: 0,08 ± 0,02; 0,18 ± 0,02; 0,28 ± 0,07; 0,05 ± 0,02 y 0,26 ± 0,07 for BW, WW, FWA, ADG y WA, respectively. The genetic correlations were all positive with the exception between BW and ADG (-0.11) and ranged between 0.10 (BW and PPE) and 0.98 (WW and FWA; FWA and ADG). The phenotypic correlations were lower than the genetic ones.  Conclusions  The FWA in (PT) which is the main selection criterion, shows the highest heritability and has positive genetic correlations with the other traits, so the simultaneous improvement of all should be expected. FWA, ADG and WA are determined by the same additive genes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[heredabilidades]]></kwd>
<kwd lng="es"><![CDATA[pruebas de comportamiento]]></kwd>
<kwd lng="es"><![CDATA[raza Santa Gertrudis]]></kwd>
<kwd lng="en"><![CDATA[heretabilities]]></kwd>
<kwd lng="en"><![CDATA[performance test]]></kwd>
<kwd lng="en"><![CDATA[Santa Gertrudis breed]]></kwd>
</kwd-group>
</article-meta>
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