<?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>S2007-11242016000200185</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Progesterona y respuesta de estrés: mecanismos de acción y sus repercusiones en rumiantes domésticos. Revisión]]></article-title>
<article-title xml:lang="en"><![CDATA[Progesterone and stress response: mechanisms of action and its impact in domestic ruminants. Review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Freitas-de-Melo]]></surname>
<given-names><![CDATA[Aline]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ungerfeld]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la República Departamento de Biología Molecular y Celular ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de la República Facultad de Veterinaria Departamento de Fisiología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>7</volume>
<numero>2</numero>
<fpage>185</fpage>
<lpage>199</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242016000200185&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242016000200185&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242016000200185&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En roedores, los tratamientos con progesterona (P4) reducen la respuesta de estrés o ansiedad a través de la acción de algunos metabolitos de la P4 (allopregnanolona y pregnanolona). Aunque existen pocos trabajos que hayan estudiado estos efectos en rumiantes, los tratamientos con P4 tienen una gran potencialidad para su aplicación práctica en sistemas productivos. El objetivo de esta revisión fue sintetizar información básica sobre la respuesta de estrés y los principales mecanismos estudiados en roedores, por los que la P4 mitiga la respuesta de estrés. Además, se presenta información primaria sobre los efectos del tratamiento con P4 en el comportamiento reactivo y la respuesta de estrés en rumiantes. Se muestran los efectos del tratamiento con P4 sobre la respuesta de estrés al destete en ovejas, y sobre algunas pruebas de temperamento en terneras. También se presenta información sobre el estrés de la esquila en ovejas gestadas, y por tanto con altas concentraciones séricas de P4. En síntesis, altas concentraciones de P4 reducen la respuesta de estrés, y pueden generar cambios en el comportamiento reactivo de los animales. Sin embargo, para que el tratamiento con P4 o sus concentraciones endógenas sean utilizados como herramienta práctica durante manejos estresantes, o como un factor a ser considerado a la hora de seleccionar animales por temperamento, es necesario realizar más estudios aplicados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In rodents, progesterone (P4) administration reduces stress responses or anxiety through the action of some metabolites of P4 (allopregnanolone and pregnanolone). Although, there are few studies on these effects in ruminants, P4 administration has a great potential for practical application in animal production. The aim of this review was to summarize the information about the stress response and the main mechanisms studied in rodents by which P4 administration reduces this response. We also include information on the effects of P4 treatment on reactive behavior and stress response in ruminants. We show that P4 administration decreases the stress response of ewes to abrupt weaning of lambs, and also affects the response to tests of assessment of temperament in female beef calves. We also present information about the stress response of shearing in pregnant ewes, therefore ewes with high serum concentrations of P4. In summary, high serum concentrations of P4 reduces the stress response and provokes changes on the reactive behavior in ruminants. However, more studies are needed to include P4 in practical managements or to consider it in the selection of animals according to their temperament.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Destete artificial]]></kwd>
<kwd lng="es"><![CDATA[Temperamento]]></kwd>
<kwd lng="es"><![CDATA[Esquila preparto]]></kwd>
<kwd lng="es"><![CDATA[Neurosteroides]]></kwd>
<kwd lng="es"><![CDATA[Ungulados]]></kwd>
<kwd lng="en"><![CDATA[Abrupt weaning]]></kwd>
<kwd lng="en"><![CDATA[Temperament]]></kwd>
<kwd lng="en"><![CDATA[Shearing]]></kwd>
<kwd lng="en"><![CDATA[Neurosteroids]]></kwd>
<kwd lng="en"><![CDATA[Ungulates]]></kwd>
</kwd-group>
</article-meta>
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