<?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>1665-1456</journal-id>
<journal-title><![CDATA[Biotecnia]]></journal-title>
<abbrev-journal-title><![CDATA[Biotecnia]]></abbrev-journal-title>
<issn>1665-1456</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Sonora, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-14562024000100180</article-id>
<article-id pub-id-type="doi">10.18633/biotecnia.v26.2261</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Polimorfismo del gen PAPPA2 asociado con la fertilidad postparto en vacas lecheras de raza Holstein manejadas bajo condiciones cálidas en el sur de Sonora México]]></article-title>
<article-title xml:lang="en"><![CDATA[Polimorphism in the PAPPA2 gene associated with postpartum fertility in Holstein milking cows managed under warm conditions in southern Sonora Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luna-Nevárez]]></surname>
<given-names><![CDATA[Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Tavares]]></surname>
<given-names><![CDATA[Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres Simental]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leyva-Corona]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medrano]]></surname>
<given-names><![CDATA[Juan F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Thomas]]></surname>
<given-names><![CDATA[Milton G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zamorano-Algandar]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nieblas-López]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Sonora Departamento de Ciencias Agronómicas y Veterinarias ]]></institution>
<addr-line><![CDATA[Ciudad Obregón Son]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of California Department of Animal Science ]]></institution>
<addr-line><![CDATA[Davis CA]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Texas A&amp;M AgriLife Research  ]]></institution>
<addr-line><![CDATA[Beeville TX]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Sonora Departamento de Agricultura y Ganadería ]]></institution>
<addr-line><![CDATA[Hermosillo Son]]></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>26</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-14562024000100180&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-14562024000100180&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-14562024000100180&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El manejo reproductivo en vacas lecheras en el sur de Sonora es un reto debido al clima cálido característico, por lo que la selección genética para fertilidad es deseable. El objetivo fue estudiar la asociación entre polimorfismos de nucleótido simple (SNPs) del gen PAPPA2 y caracteres de fertilidad postparto en vacas Holstein lactantes. Un total de 362 vacas fueron incluidas en el estudio. Muestras de sangre individuales fueron recolectadas y vaciadas en tarjetas FTA, las cuales fueron usadas para la extracción de ADN y genotipificación de dos SNPs del gen PAPPA2. Posteriormente se realizó un estudio asociativo entre los genotipos de los SNPs y caracteres reproductivos postparto, usando un modelo estadístico de efectos mixtos. Sólo el SNP rs109952914 se asoció con todos los rasgos reproductivos estudiados por lo que fue retenido para el análisis de substitución alélica. El alelo favorable del SNP rs109952914 fue el alelo T (P &lt; 0.05), ya que éste aumentó el porcentaje de preñez a primer servicio (+12.60), y redujo los servicios por concepción (-0.16) y los días abiertos (-19.52). En conclusión, un SNP dentro del gen PAPPA2 resultó ser predictor de la fertilidad postparto, por lo cual se recomienda usarlo como marcador genético en programas de mejoramiento animal para incrementar la eficiencia reproductiva en vacas Holstein expuestas a condiciones ambientales cálidas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Reproductive management in dairy cows in southern Sonora is a challenge due to the characteristic hot climate, thus, genetic selection for fertility is desirable. Our objective was to study the association between single nucleotide polymorphisms (SNPs) from the PAPPA2 gene and postpartum fertility traits in lactating Holstein cows. A total of 362 cows were included in this study. Individual blood samples were collected on FTA cards, which were used for DNA extraction and genotyping of two PAPPA2 gene SNPs. An associative study was then performed between the genotypes of the SNPs and postpartum reproductive traits using a statistical mixed-effects model. Only the SNP rs109952914 was associated with all fertility traits and retained for allele substitution analysis. The favorable allele of the SNP rs109952914 was the T allele (P &lt; 0.05), as it increased the percentage of pregnancy at first service (+ 12.60), and reduced services per conception (- 0.16) and days open (- 19.52). In conclusion, a SNP within the PAPPA2 gene was a predictor of postpartum fertility in Holstein dairy cows; then, it was recommended to be used as genetic marker in animal breeding programs to increase reproductive efficiency in Holstein dairy cattle managed under warm environmental conditions.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[dairy cattle]]></kwd>
<kwd lng="en"><![CDATA[DNA]]></kwd>
<kwd lng="en"><![CDATA[hot climate]]></kwd>
<kwd lng="en"><![CDATA[reproduction]]></kwd>
<kwd lng="en"><![CDATA[SNP]]></kwd>
<kwd lng="es"><![CDATA[ADN]]></kwd>
<kwd lng="es"><![CDATA[clima caluroso]]></kwd>
<kwd lng="es"><![CDATA[reproducción]]></kwd>
<kwd lng="es"><![CDATA[SNP]]></kwd>
<kwd lng="es"><![CDATA[ganado lechero]]></kwd>
</kwd-group>
</article-meta>
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