<?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>2007-0705</journal-id>
<journal-title><![CDATA[Nova scientia]]></journal-title>
<abbrev-journal-title><![CDATA[Nova scientia]]></abbrev-journal-title>
<issn>2007-0705</issn>
<publisher>
<publisher-name><![CDATA[Universidad de La Salle Bajío A. C., Coordinación de Investigación]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-07052020000100010</article-id>
<article-id pub-id-type="doi">10.21640/ns.v12i24.2305</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Impacto de las evaluaciones genéticas en las tendencias genéticas de bovinos Jersey y Suizo Americano en México]]></article-title>
<article-title xml:lang="en"><![CDATA[Impact of genetic evaluations on the genetic trends of Jersey and Brown Swiss cattle in Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Larios-Sarabia]]></surname>
<given-names><![CDATA[Neon]]></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[Núñez-Domínguez]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Muñiz]]></surname>
<given-names><![CDATA[José G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruíz-Flores]]></surname>
<given-names><![CDATA[Agustín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Zootecnia Posgrado en Producción Animal]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>12</volume>
<numero>24</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-07052020000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-07052020000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-07052020000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  El hato bovino lechero especializado nacional presenta pocas estimaciones de tendencias genéticas estimadas en años recientes. Esta falta de información limita la evaluación del progreso genético obtenido y la estimación del impacto de las evaluaciones genéticas (EG) nacionales. Los objetivos del estudio fueron cuantificar el progreso genético de las poblaciones bovinas lecheras Jersey y Suizo Americano, antes y después de la implementación de las EG nacionales, así como analizar las principales causas del cambio genético estimado.  Método:  Se utilizaron las bases de datos genealógicos y productivos de las respectivas asociaciones nacionales de criadores de ganado de registro. Se analizaron los valores genéticos de producción de leche (PL) ajustada a 305 y 210 días de lactancia, para los años de 1994-2015 y 1986-2016, para Jersey y Suizo Americano, respectivamente. Las tendencias genéticas se estimaron mediante la regresión ponderada por el número de animales de los valores genéticos sobre los años de nacimiento. Para analizar el progreso genético, las tendencias se estimaron por periodos (considerando el inicio de las EG nacionales), rutas de selección, origen de los padres, hatos y por promedios ponderados de los sementales.  Resultados:  En ambas razas las tendencias genéticas generales y por periodo para PL fueron significativamente diferentes de cero (p&lt;0.001). En Jersey la tendencia fue -21.3 kg año-1 para el periodo completo, con una tendencia positiva antes de las EG nacionales (28.1 kg año-1) y negativa (-49.0 kg año-1) después de éstas. En Suizo Americano la tendencia general fue 2.4 kg año-1; antes de las EG nacionales fue positiva, pero de baja magnitud (3.2 kg año-1); después de las EG la tendencia se redujo aún más (0.43 kg año-1). En ambas razas el mejoramiento genético antes y después de las EG nacionales no cambió su estructura en cuanto a las rutas de selección o el origen de los progenitores. Las mayores diferencias entre los promedios ponderados y los no ponderados fueron en aquellos años de mayor progreso genético, a diferencia de los últimos 10 años. También, se encontraron hatos con diferentes objetivos de selección a la mayoría de los criadores de la raza, y su exclusión (Jersey) o inclusión (Suizo Americano) del hato nacional de registro contribuyó con la caída del progreso genético para PL en el segundo periodo.  Conclusión:  El progreso genético para PL de las poblaciones estudiadas ha sido bajo en Suizo Americano y negativo en Jersey, en ambas razas éste se redujo después del inicio de las EG nacionales, por lo que éstas no han tenido un impacto positivo determinante en el progreso genético para PL en estas poblaciones. Los resultados indican la necesidad de reestructurar el programa nacional de mejoramiento genético de las poblaciones estudiadas, con la participación conjunta de los actores involucrados en el sector.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  The national specialized dairy herd has few estimates of genetic trends made in recent years. This lack of information limits the evaluation of both the genetic progress obtained and the estimation of the impact of national genetic evaluations (GE). The aims of this study were to estimate the genetic progress for Jersey and Brown Swiss dairy cattle populations, before and after the implementation of the national GE, and to analyze the main causes of the estimated genetic change.  Method:  The genealogical and productive databases of the respective national associations of registered dairy cattle breeders were used. Breeding values for milk yield (MY), adjusted to 305 and 210 days in lactation, were analyzed for the periods 1994-2015 and 1986-2016, for Jersey and Brown Swiss, respectively. Genetic trends were estimated by weighted regression by the number of animals of breeding values over the years of birth. To analyze the genetic progress, trends were estimated by periods (considering the year of start of the national GE), selection paths, origin of parents, herds, and by weighted averages of the sires&#8217; breeding values.  Results:  In both breeds the general and per period genetic trends for MY were significantly different from zero (p&lt;0.001). For Jersey, the trend for the whole period was -21.3 kg year-1, with a positive trend before the national GE (28.1 kg year-1) and negative (-49.0 kg year-1) after them. For the Brown Swiss breed, the general trend was 2.4 kg year-1; before the national GE the genetic trend was positive but of low magnitude (3.2 kg year-1); after the GE the genetic trend was reduced even further (0.43 kg year-1). In both breeds the genetic improvement before and after the national GE did not affect their structure in terms of the selection paths or origin of parents. The largest differences between weighted and unweighted averages were for those years with high genetic progress, unlike the last 10 years that showed the lowest genetic progress. Also, herds with selection objectives different to the majority of herds were found, and their exclusion (Jersey) or inclusion (Brown Swiss) from the national registered herd contributed significantly to decline the genetic progress for MY in the second period.  Conclusion:  The genetic improvement of MY for the populations studied has been positive but low for Brown Swiss and negative for Jersey. The genetic progress in both breeds decreased after the implementation of the national GE, so they have not had a positive impact on genetic improvement of MY in these populations. The results indicate the need to restructure the national genetic improvement program of the dairy populations studied, with the joint participation of the actors involved in the sector.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[valor genético]]></kwd>
<kwd lng="es"><![CDATA[mejoramiento genético]]></kwd>
<kwd lng="es"><![CDATA[producción de leche]]></kwd>
<kwd lng="es"><![CDATA[bovinos]]></kwd>
<kwd lng="en"><![CDATA[breeding value]]></kwd>
<kwd lng="en"><![CDATA[genetic improvement]]></kwd>
<kwd lng="en"><![CDATA[milk production]]></kwd>
<kwd lng="en"><![CDATA[bovine]]></kwd>
</kwd-group>
</article-meta>
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