<?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>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212015000200211</article-id>
<article-id pub-id-type="doi">10.15517/am.v26i2.19277</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variables Fisiológicas-Metabólicas de Estrés Calórico en Vacas Bajo Silvopastoreo y Pradera sin Árboles]]></article-title>
<article-title xml:lang="en"><![CDATA[Physiological-metabolic variables of heat stress in cows grazing in silvopastoral systems and in one treeless prairie]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barragán-Hernández]]></surname>
<given-names><![CDATA[Wilson Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mahecha-Ledesma]]></surname>
<given-names><![CDATA[Liliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cajas-Girón]]></surname>
<given-names><![CDATA[Yasmin Socorro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (CORPOICA) Centro de Investigación Turipaná ]]></institution>
<addr-line><![CDATA[Cereté ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agrarias ]]></institution>
<addr-line><![CDATA[ Medellín]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (CORPOICA) Centro de Investigación Turipaná ]]></institution>
<addr-line><![CDATA[Cereté ]]></addr-line>
<country>CO</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>26</volume>
<numero>2</numero>
<fpage>211</fpage>
<lpage>223</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212015000200211&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212015000200211&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212015000200211&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:Variables fisiológicas-metabólicas de estrés calórico en vacas bajo silvopastoreo y pradera sin árboles. El presente trabajo tuvo como objetivo valorar cambios en parámetros fisiológicos y metabólicos como indicadores de estrés calórico de vacas bajo pastoreo. El estudio se llevó a cabo en el Centro de Investigación Corpoica Turipaná, Región Caribe, Cereté, Colombia, durante los años 2011-2012. Se determinó la temperatura ambiental (T) y la humedad relativa (H), y en los animales: temperatura rectal (TR), temperatura de piel (TP), frecuencia respiratoria (FR) y el estatus ácido-básico. Las variables fueron medidas en la mañana (6:00 h) y tarde (13:00 h). Se encontró efecto del tratamiento en la temperatura ambiental con 7 y 6% menos temperatura en p-Arbus-Arbor y p-Arbor, respectivamente, comparados con el tratamiento Pasto. Hubo efecto de la hora (p&lt;0,05) en T y H e interacción tratamiento x hora en la T (p&lt;0,05). Las variables TP y FR registraron efecto (p&lt;0.05) del tratamiento, hora e interacción tratamiento x hora (6:00/13:00 h). Se mostró un efecto positivo del sombrío proveniente de árboles en el sistema sobre las variables fisiológicas. Los efectos negativos observados en tratamientos sin sombrío de árboles repercutieron de forma mínima en alteraciones metabólicas, evidenciando respuestas homeostáticas en el animal ante las condiciones ambientales estresantes evaluadas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:The aim of this work was to analyze changes of physiological and metabolic parameters as indicators of heat stress of cows in pasture systems. The research was carried out from 2011 to 2012 at the Turipaná Agricultural Research Center of Corpoica located in the Caribbean region in Cereté-Colombia. Environmental temperature (T) and relative humidity (H) were determined, as well as and rectal temperature (RT), skin temperature (ST), respiratory frequency (RF) and the acid-basic status of animals. The variables were measured in the morning (6:00 h) and in the afternoon (13:00 h). Significant Statistical differences were observed (p&lt;0.05) in environmental temperature treatments (T) with 7% and 6% less temperature in p-Arbus-Arbor y p-Arbor, respectively, compared with grass treatment. There was a significant hour effect on T and H (p&lt;0.05) and a significant treatment-hour interaction on T (p&lt;0.05). TP and FR showed a significant treatment-hour interaction per hour (6:00/13:00 h). The results show a positive effect of shadow from trees on the physiological variables. The negative effects observed on the physiological variables of unshaded treatments impacted in a minimal way the metabolic variables suggesting homeostatic responses in the animals under the evaluated stressful environmental conditions.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[bienestar animal]]></kwd>
<kwd lng="es"><![CDATA[estrés térmico]]></kwd>
<kwd lng="es"><![CDATA[sombra de árboles]]></kwd>
<kwd lng="es"><![CDATA[sombra de arbustos.]]></kwd>
<kwd lng="en"><![CDATA[animal welfare]]></kwd>
<kwd lng="en"><![CDATA[heat stress]]></kwd>
<kwd lng="en"><![CDATA[trees shade]]></kwd>
<kwd lng="en"><![CDATA[shrubs shade.]]></kwd>
</kwd-group>
</article-meta>
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<conf-loc>Reno, Nevada </conf-loc>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
