<?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>1688-4809</journal-id>
<journal-title><![CDATA[Veterinaria (Montevideo)]]></journal-title>
<abbrev-journal-title><![CDATA[Veterinaria (Montev.)]]></abbrev-journal-title>
<issn>1688-4809</issn>
<publisher>
<publisher-name><![CDATA[Sociedad de Medicina Veterinaria del Uruguay]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-48092020000201401</article-id>
<article-id pub-id-type="doi">10.29155/vet.56.214.2</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Inseminación artificial con semen congelado equino: reacción inflamatoria, transporte espermático y técnica de inseminación]]></article-title>
<article-title xml:lang="en"><![CDATA[Artificial insemination with frozen equine semen: inflammatory reaction, sperm transport and insemination technique]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cazales Penino]]></surname>
<given-names><![CDATA[Nicolás]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estradé]]></surname>
<given-names><![CDATA[María José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Costa Mattos]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,UDELAR Facultad de Veterinaria Unidad Académica Reproducción Animal]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UFRGS Faculdade de Veterinária Reprolab, Departamento de Medicina Animal]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</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>56</volume>
<numero>214</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-48092020000201401&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-48092020000201401&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-48092020000201401&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El objetivo de la siguiente revisión es discutir el efecto sobre la fertilidad de algunos factores clásicamente reconocidos como relevantes para el éxito de la inseminación artificial (IA) con semen congelado equino: número total de espermatozoides por IA (dosis), número de inseminaciones por ciclo (frecuencia de IA), momento óptimo de la IA relativo a la ovulación, sitio de inseminación y técnica de IA. La IA con semen congelado ha ganado popularidad entre los propietarios y veterinarios que trabajan con equinos. La dosis mínima recomendada para la IA convencional en el cuerpo del útero con semen congelado ha sido establecida en 250 x 106 de espermatozoides con motilidad progresiva. Sin embargo, la dosis mínima requerida para mantener buenos índices de preñez parece depender de la fertilidad intrínseca de cada padrillo, así como del sitio de inseminación. La inseminación profunda en la punta del cuerno es un procedimiento de rutina entre los veterinarios de campo cuando se utiliza dosis de inseminación baja. Por otro lado, el número de inseminaciones por ciclo parecería no afectar los índices de preñez siempre y cuando la última inseminación sea realizada en la ventana de tiempo entre 12 h antes o 12 h después de la ovulación. El ovocito equino permanece viable y con plena capacidad de ser fertilizado por 12 a 15 h pos-ovulación, no habiendo un aumento en las tasas de pérdidas embrionarias hasta pasadas las 12 horas pos-ovulación. Por lo que en inseminaciones pos-ovulatorias y utilizando un agente inductor de la ovulación, no habría ninguna ventaja en revisar las yeguas en intervalos menores a 12 h, ya que no parecería mejorar los índices de preñez ni las tasas de pérdida embrionaria. En conclusión, la técnica de IA será determinada por el número y costo de las dosis de semen disponibles, estatus de la yegua a inseminar y fertilidad del semen congelado.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The aim of the following review is to discuss the effect on fertility of some factors classically recognized as relevant to the success of artificial insemination (AI) with frozen equine semen: total sperm numbers per AI (dose), number of inseminations per cycle (AI frequency), optimal timing of AI relative to ovulation, AI site and AI techniques. The frozen semen AI is widely used in the equine industry. The minimum recommended dose of spermatozoa has been established in 250 x 106 progressive motile sperm for uterine body insemination. However, the minimum dose required for maintaining the highest fertility for each stallion may differ greatly and therefore is determined by individual variation of intrinsic stallion fertility as well as with the insemination site. Deep intra-uterine insemination is commonly accepted as a routine procedure for AI with low doses. The number of AIs per cycles does not seem to be a factor affecting the final outcome of pregnancy as long as the last AI is performed within 12 h before and 12 h after the ovulation. Contrary to the extended practitioners belief, the mare&#8217;s oocyte could remain viable and fully capable of fertilization for 12-15 h, and the embryo loss rate after post-ovulatory insemination does not begin to increase until 12 h post-ovulation. Therefore, in a postovulatory insemination regime and using an ovulation inducing agent, examination of mares at intervals of any less than 12 h does not improve pregnancy or embryo loss rates. In conclusion, the number and cost of available semen doses, status of the mare to be inseminated and fertility of the frozen semen will determine the AI technique.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Dosis bajas]]></kwd>
<kwd lng="es"><![CDATA[Inseminacion profunda]]></kwd>
<kwd lng="es"><![CDATA[Semen congelado]]></kwd>
<kwd lng="es"><![CDATA[PMNs]]></kwd>
<kwd lng="es"><![CDATA[Estrato compacto]]></kwd>
<kwd lng="es"><![CDATA[Estrato esponjoso]]></kwd>
<kwd lng="en"><![CDATA[Low dose insemination, Deep-horn insemination, Frozen semen, PMNs, Stratum compactum]]></kwd>
<kwd lng="en"><![CDATA[Stratum spongiosum]]></kwd>
</kwd-group>
</article-meta>
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