<?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>S2007-11242020000300738</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v11i3.4828</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto del reemplazo folicular (GnRH) y de somatotropina bovina (bST) sobre la fertilidad de vacas lecheras expuestas a estrés calórico]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of follicular replacement (GnRH) and bovine somatotropin (bST) on the fertility of dairy cows exposed to heat stress]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lozano-Domínguez]]></surname>
<given-names><![CDATA[Renato Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aréchiga-Flores]]></surname>
<given-names><![CDATA[Carlos Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Carlos]]></surname>
<given-names><![CDATA[Marco Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortés-Vidauri]]></surname>
<given-names><![CDATA[Zimri]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rincón-Delgado]]></surname>
<given-names><![CDATA[Melba]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrera-Chávez]]></surname>
<given-names><![CDATA[José Ma.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Macías-Cruz]]></surname>
<given-names><![CDATA[Ulises]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Cerón]]></surname>
<given-names><![CDATA[Joel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Zacatecas Unidad Académica de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[ Zacatecas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Ciudad Juárez Instituto de Ciencias Biomédicas Departamento de Ciencias Veterinarias]]></institution>
<addr-line><![CDATA[Ciudad Juarez Chihuahua]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Baja California Instituto de Ciencias Agrícolas ]]></institution>
<addr-line><![CDATA[Mexicali Baja California]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Veterinaria y Zootecnia Departamento de Reproducción]]></institution>
<addr-line><![CDATA[Ciudad Universitaria Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>11</volume>
<numero>3</numero>
<fpage>738</fpage>
<lpage>756</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242020000300738&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242020000300738&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242020000300738&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Tres protocolos reproductivos fueron evaluados: 1) PG: inyección de PGF2&#945; en el día 50 posparto e inseminación (IA) en base a detección del estro. 2) OVS (Ovsynch: día 0, GnRH; día 7, PGF2&#945;; día 9, GnRH; día 10, IA); y 3) ROV (GnRH + Ovsynch: día- 7, GnRH; día 0, GnRH; día 7, PGF2&#945;; día 9, GnRH; día 10, IA). Además, el efecto de la somatotropina (bST) a la IA, sobre la fertilidad al primer servicio posparto (FERT), y la tasa de preñez a 99 días posparto (PP). FERT fue similar en ROV y OVS (36.2 vs 36.6 %) (P&gt;0.05); y mayor a PG (27.3 %) (P&lt;0.05). Igualmente, FERT fue similar con bST y sin bST (36.2 vs 30.6 %, P&gt;0.05). PG y sin bST (22.5 %) fue menor que OVS con (38.5 %), y sin bST (33.7 %); y que ROV con bST (37.0 %) y sin bST (36.1 %); y PG con bST (32.9 %) (P&lt;0.05). La tasa de preñez a 99 días PP fue: OVS (60.6 %); ROV (54.3 %), superior al grupo PG (46.8 %) (P&lt;0.05). OVS con bST (64.7 %), y sin bST (56.5 %), y ROV sin bST fueron mayores que PG sin bST (41.1 %, P&lt;0.05). En conclusión, GnRH previo al Ovsynch (ROV) y la bST al momento de la IA no incrementaron la fertilidad del primer servicio en vacas Holstein en estrés calórico. OVS y ROV incrementaron la fertilidad del primer servicio posparto y la tasa de preñez a 99 días posparto. La somatotropina incrementó la fertilidad del primer servicio posparto solo en vacas tratadas con PG.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Three reproductive protocols were evaluated: 1) PG: injection of PGF2&#945; on d-50 postpartum and insemination (AI) based on estrus detection. 2) OVS (Ovsynch: d 0, GnRH; d 7, PGF2&#945;; d 9, GnRH; d 10, AI); 3) ROV (GnRH + Ovsynch: d- 7, GnRH; d 0, GnRH; d 7 PGF2&#945;; d 9, GnRB; d 10, AI). In addition, the effect of somatotropin (bST) to AI, on fertility at first postpartum service (FERT), and pregnancy rate at 99 d postpartum (PP) FERT was similar in ROV and OVS (36.2 vs 36.6 %) (P&gt;0.05); and higher than PG (27.3 %) (P&lt;0.05). Likewise, FERT was similar with and without bST (36.2 vs 30.6 %, P&gt;0.05). PG and without bST (22.5 %) was lower than OVS with (38.5 %) and without bST (33.7 %), as well as than ROV with (37.0 %) and without bST (36.1 %), and PG with bST (32.9 %). The pregnancy rate at 99 d was: OVS (60.6 %); ROV (54.3 %), higher than PG group (46.8 %) (P&gt;0.05). OVS with (64.7 %) and without bST (56.5 %) and ROV without bST were higher than PG without bST (41.1 %, P&lt;0.05). In conclusion, GnRH before Ovsynch (ROV) and bST at AI did not increase fertility at the first service in Holstein cows under heat stress. OVS and ROV increased fertility of first service postpartum and pregnancy rate to 99 d postpartum. Somatotropin increased fertility of first postpartum service only in PG treated cows.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Vaca lechera]]></kwd>
<kwd lng="es"><![CDATA[Ovsynch]]></kwd>
<kwd lng="es"><![CDATA[Somatotropina]]></kwd>
<kwd lng="es"><![CDATA[Estrés calórico]]></kwd>
<kwd lng="es"><![CDATA[GnRH]]></kwd>
<kwd lng="en"><![CDATA[Dairy cow]]></kwd>
<kwd lng="en"><![CDATA[Ovsynch]]></kwd>
<kwd lng="en"><![CDATA[Somatotropin]]></kwd>
<kwd lng="en"><![CDATA[heat stress]]></kwd>
<kwd lng="en"><![CDATA[GnRH]]></kwd>
</kwd-group>
</article-meta>
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