<?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>2007-7858</journal-id>
<journal-title><![CDATA[CienciaUAT]]></journal-title>
<abbrev-journal-title><![CDATA[CienciaUAT]]></abbrev-journal-title>
<issn>2007-7858</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma de Tamaulipas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-78582019000100141</article-id>
<article-id pub-id-type="doi">10.29059/cienciauat.v13i2.1012</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Sincronización del estro en ovejas de pelo mediante protocolo basado en prostaglandinas + GnRH]]></article-title>
<article-title xml:lang="en"><![CDATA[Estrous synchronization in hair sheep using a protocol based on prostaglandin + GnRH]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ávila-Castillo]]></surname>
<given-names><![CDATA[Blas Rogelio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Flores]]></surname>
<given-names><![CDATA[Enrique Octavio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molina-Mendoza]]></surname>
<given-names><![CDATA[Pedro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peralta-Ortiz]]></surname>
<given-names><![CDATA[J. Jesús German]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Torres-Esqueda]]></surname>
<given-names><![CDATA[María Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo  ]]></institution>
<addr-line><![CDATA[Tulancingo Hidalgo]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guadalajara  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Intercultural del Estado de Puebla  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Montecillo ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<volume>13</volume>
<numero>2</numero>
<fpage>141</fpage>
<lpage>151</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-78582019000100141&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-78582019000100141&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-78582019000100141&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El uso de progestágenos puede contaminar el medio ambiente y el tejido animal, por lo que el uso de prostaglandinas F2&#945; (PGF2&#945;) y hormona liberadora de gonadotropinas (GnRH) pueden representar una alternativa viable. El objetivo del presente trabajo fue evaluar el efecto de aplicar una dosis de GnRH en el intervalo de aplicación de dos dosis de PGF2&#945;, y compararlo con protocolos basados en progestágenos y PGF2&#945;, comúnmente utilizados en la sincronización de estros, con respecto al pico pre-ovulatorio de la hormona luteinizante (LH), concentraciones de progesterona post-estro, tasa de preñez, pariciones y prolificidad. Después de una pre-sincronización con doble aplicación de PGF2&#945;, 30 ovejas adultas multíparas (peso vivo = 45 ± 3.1 kg, condición corporal= 3.2 ± 0.5 unidades y tiempo post-parto = 60 d a 90 d) fueron asignadas aleatoriamente a uno de tres tratamientos (n = 10). Grupo 1: P (Testigo), recibieron dosis única de 125 &#956;g de cloprostenol por vía IM (intramuscular); Grupo 2: FP, recibieron esponjas intravaginales que contenían 20 mg de acetato de fluorgestona por 5 d, y al retiro de la esponja fueron inyectadas con 125 &#956;g de cloprostenol vía IM; Grupo 3: GP, recibieron 50 &#956;g de GnRH IM, y 7 d después fueron inyectadas con 125 &#956;g de cloprostenol. El inicio del estro fue más rápido (P &#8804; 0.05) en el grupo P comparado con el grupo FP. El grupo GP (P &#8804; 0.05) tuvo mayores concentraciones de progesterona después de 5 d postestro, comparado con los grupos P y FP. La tasa de preñez no fue diferente (P &gt; 0.05) entre grupos. Los protocolos de sincronización evaluados fueron semejantes en su efectividad para mejorar el comportamiento reproductivo en ovejas de pelo. Se recomienda usar protocolos basados en su aplicación de PGF2&#945;, debido a su facilidad de aplicación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The use of progestogens can contaminate the environment and animal tissue. Therefore, the use of prostaglandins F2&#945; (PGF2&#945;) and gonadotropin-releasing hormone (GnRH) may represent a viable alternative. The aim of the present work was to evaluate the effect of applying a dose of GnRH within the range of application of two doses of PGF2&#945;, and compare it with protocols based on progestogens and PGF2&#945;, commonly used in the synchronization of estrus, with respect to the pre-ovulatory peak of luteinizing hormone (LH), post-estrus progesterone concentrations, pregnancy rate, calving and prolificacy. After a pre-synchronization with a double application of PGF2&#945;, 30 multiparous adult ewes (live weight = 45 ± 3.1 kg, body condition = 3.2 ± 0.5 units and postpartum time = 60 d to 90 d, were randomly assigned to one of three treatments (n = 10). The ewes in Group 1: P (Control) received a single dose of 125 &#956;g of cloprostenol via IM (intramuscular); the ewes in Group 2: FP received intravaginal sponges containing 20 mg of fluorogestone acetate for 5 d; and upon removal of the sponge, they were injected with 125 &#956;g of cloprostenol via IM; the ewes in Group 3: GP received 50 &#956;g of GnRH IM, and 7 d later they were injected with 125 &#956;g of cloprostenol. The onset of estrus was detected faster (P &#8804; 0.05) in P and GP groups than in the FP group. The GP group (P &#8804; 0.05) had higher concentrations of progesterone after 5 d post-estrus, compared to the P and FP groups. The pregnancy rate was not different (P &gt; 0.05) between groups. All the synchronization protocols evaluated were similar in the effectiveness to improve the reproductive behavior in hair sheep. Therefore, the use of protocols based on the application of PGF2&#945; is recommended, due to their its ease of application.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cuerpo lúteo]]></kwd>
<kwd lng="es"><![CDATA[progesterona]]></kwd>
<kwd lng="es"><![CDATA[hormona luteinizante]]></kwd>
<kwd lng="es"><![CDATA[estro]]></kwd>
<kwd lng="es"><![CDATA[gestación]]></kwd>
<kwd lng="en"><![CDATA[corpus luteum]]></kwd>
<kwd lng="en"><![CDATA[progesterone]]></kwd>
<kwd lng="en"><![CDATA[luteinizing hormone]]></kwd>
<kwd lng="en"><![CDATA[estrus]]></kwd>
<kwd lng="en"><![CDATA[gestation]]></kwd>
</kwd-group>
</article-meta>
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