<?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>2448-6760</journal-id>
<journal-title><![CDATA[Veterinaria México OA]]></journal-title>
<abbrev-journal-title><![CDATA[Veterinaria México OA]]></abbrev-journal-title>
<issn>2448-6760</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina Veterinaria y Zootecnia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2448-67602022000100309</article-id>
<article-id pub-id-type="doi">10.22201/fmvz.24486760el2022.1056</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Fertility in dairy cows treated in the early luteal phase with a reused progesterone-releasing intravaginal device]]></article-title>
<article-title xml:lang="es"><![CDATA[Fertilidad en vacas lecheras tratadas en la fase lútea temprana con un dispositivo intravaginal liberador de progesterona reutilizado]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meneses Arias]]></surname>
<given-names><![CDATA[Graciela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera Acuña]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montaldo]]></surname>
<given-names><![CDATA[Hugo Horacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez López]]></surname>
<given-names><![CDATA[Martha]]></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 Nacional Autónoma de México Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico de Sonora Departamento de Ciencias Agronómicas y Veterinarias ]]></institution>
<addr-line><![CDATA[Cd. Obregón Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>9</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-67602022000100309&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-67602022000100309&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-67602022000100309&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In this study, we tested whether early luteal phase treatment with a previously used progesterone-releasing intravaginal device (DIV) increased conception rate (CR) in dairy cows. Two experiments were performed; in the first, progesterone concentrations were determined in cows treated with a reused DIV. Seven cows received PGF2&#945; and a reused DIV was inserted for seven days. Blood samples were collected daily for progesterone determination. Progesterone increased from 0.42 ± 0.17 ng/mL (mean ± standard deviation) at DIV insertion to 1.99 ± 0.52 ng/mL at 24 h and 2.11 ± 0.40 ng/mL at 48 h after; during the treatment period, progesterone showed an average concentration of 1.4 ± 0.55 ng/mL. In the second experiment, 383 cows were randomly divided on day 4 post-insemination, into two treatment groups: DIV (n = 188), received a reused DIV, which was removed on day 14; Control (n = 195), did not receive DIV. Progesterone concentrations were determined in seven cows from each group. The CR was not affected by treatment [DIV (33.5 %) vs. Control (37.4 %); P &gt; 0.05]. No interaction was observed between treatment and service number, parity, the type of postpartum (normal or pathological), body condition, or days in milk (P &gt; 0.05). Progesterone concentrations were similar between treatments (P &gt; 0.05). We conclude that the insertion of a reused DIV at early diestrus did not increase serum progesterone concentrations or conception rate in dairy cows.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Probamos si el tratamiento en la fase lútea temprana con un dispositivo intravaginal liberador de progesterona (DIV) reutilizado incrementa el porcentaje de concepción (PC) en vacas lecheras. Se realizaron dos experimentos; en el primero, se determinaron las concentraciones de progesterona en vacas tratadas con un DIV reutilizado. Siete vacas recibieron PGF2&#945; y se insertó durante siete días un DIV reutilizado. Se determinaron diariamente las concentraciones de progesterona, las cuales se incrementaron de 0.42 ± 0.17 ng/mL (media ± desviación estándar) al momento de la inserción del DIV a 1.99 ± 0.52 ng/mL a las 24 h y a 2.11 ± 0.40 ng/mL a las 48 h; la concentración promedio fue de 1.4 ± 0.55 ng/mL. En el segundo experimento, 383 vacas se asignaron el día cuatro posinseminación a dos tratamientos: DIV (n = 188), recibieron un DIV reutilizado, el cual se retiró el día 14; Testigo (n = 195), no recibieron dispositivo. Se determinaron las concentraciones de progesterona en siete vacas de cada grupo. El PC no fue afectado por el tratamiento [DIV (33.5 %) vs Testigo (37.4 %); P &gt; 0.05]. No se observó interacción del tratamiento con el número de servicio, número de parto, tipo de puerperio (normal o patológico), condición corporal o días en leche (P &gt; 0.05). Las concentraciones de progesterona fueron similares entre los tratamientos (P &gt; 0.05). Se concluye que la inserción de un DIV reutilizado en la fase lútea temprana no aumenta las concentraciones de progesterona ni incrementa el PC en vacas lecheras.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[progesterone]]></kwd>
<kwd lng="en"><![CDATA[intravaginal progesterone-releasing device]]></kwd>
<kwd lng="en"><![CDATA[dairy cows]]></kwd>
<kwd lng="en"><![CDATA[fertility]]></kwd>
<kwd lng="es"><![CDATA[progesterona]]></kwd>
<kwd lng="es"><![CDATA[dispositivo intravaginal]]></kwd>
<kwd lng="es"><![CDATA[fertilidad]]></kwd>
<kwd lng="es"><![CDATA[vacas lecheras]]></kwd>
</kwd-group>
</article-meta>
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