<?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>S1659-13212019000300751</article-id>
<article-id pub-id-type="doi">10.15517/am.v30i3.36296</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estrés calórico y conteo de dípteros hematófagos en sistemas silvopastoriles de estratos múltiples 1]]></article-title>
<article-title xml:lang="en"><![CDATA[Heat stress and blood-sucking diptera count in multi-level silvopastoral systems]]></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[Benavidez-Cruz]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zúñiga-López]]></surname>
<given-names><![CDATA[Aldemar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espitia-Pacheco]]></surname>
<given-names><![CDATA[Amado]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cardozo-Cerquera]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (Agrosavia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (Agrosavia)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (Agrosavia)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Sucre  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (Agrosavia)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>30</volume>
<numero>3</numero>
<fpage>751</fpage>
<lpage>765</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212019000300751&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212019000300751&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212019000300751&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. Los sistemas silvopastoriles son esquemas de producción ganadera con potencial para mitigar el efecto negativo del ambiente en la productividad animal. Objetivo. El objetivo del presente trabajo fue evaluar los efectos de sistemas silvopastoriles de estratos múltiples sobre el estrés calórico y la población de dípteros hematófagos en ganado de carne. Materiales y métodos. Se analizó entre mayo y octubre del 2014, en el centro de investigación Turipaná, Córdoba, Colombia, el comportamiento de animales Cebú Brahman y Romosinuano, en dos arreglos silvopastoriles (aSSP) con diversidad en su composición y estratificación vegetal (p-Arbust con dos estratos y p-Arbust-Arbor con tres estratos) y en una pradera sin árboles, con un diseño de bloques completos al azar. En cada tratamiento se evaluaron la temperatura ambiental (TA) y la humedad relativa (HR), y se construyó un índice de temperatura-humedad (ITH). En los animales se evaluó la temperatura de piel (TP) y la frecuencia respiratoria (FR) a dos horas del día (6:00 y 13:00), y se contaron los dípteros hematófagos (CDH) entre las 8:00 y 10:00 h. Los datos se sometieron a un análisis de varianza para modelos mixtos en las variables TA, HR, TP e ITH y modelos mixtos generalizados para CDH y FR. Resultados. Las variables ambientales estuvieron influenciadas por múltiples factores, entre ellos, el cambio en los horarios de muestreo y el arreglo silvopastoril. La mayor carga ambiental (ITH) se observó durante la tarde, evaluación que influyó significativamente sobre la respuesta en FR con aumentos que alcanzaron 2,1 veces más en el tratamiento Pasto, contra 0,8 en p-Arbust-Arbor. Conclusiones. Los aSSP evaluados presentaron ventajas comparativas frente a la reducción del estrés calórico y el conteo de moscas hematófagas bajo condiciones del valle medio del río Sinú. El aSSP p-Arbust, logró mantener los conteos de moscas más bajos a través del tiempo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. Silvopastoral systems are livestock scheme production schemes with the potential to mitigate the negative effect of the environment on animal productivity. Objective. The objective of this work was to evaluate the effects of multi-stratum silvopastoral systems on heat stress and the population of hematophagous dipterans in beef cattle. Materials and methods. Between May and October 2014, in the Turipaná research center in Córdoba, Colombia, the behavior of Cebu Brahman and Romosinuano animals was analyzed in two silvopastoral arrangements (aSSP) with diversity in their composition and plant stratification (p-Arbust with two strata and p-Arbust-Arbor with three strata) and in a treeless prairie, with a random complete block design. In each treatment, the environmental temperature (TA) and relative humidity (RH) were evaluated, and a temperature-humidity index (ITH) was constructed. In animals the skin temperature (TP) and respiratory rate (FR) were evaluated at two hours of the day (6:00 and 13:00), and hematophagous diptera (CDH) were counted between 8:00 and 10:00 a.m. The data were submitted to a variance analysis for mixed models in the variables TA, HR, TP and ITH and generalized mixed models for CDH and FR. Results. The environmental variables were influenced by multiple factors including: the change in sampling schedules, and the silvopastoral arrangement. The highest environmental load (ITH) was observed during the afternoon, an evaluation that significantly influenced the response in FR with increases that reached 2.1 times more in the Pasto treatment, against 0.8 in p-Arbust-Arbor. Conclusions. The aSSP evaluated presented comparative advantages against the reduction of heat stress and the count of hematophage flies under conditions of the middle valley of the Sinu River. The aSSP p-Arbust managed to keep fly counts lower over time.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[agroforestería]]></kwd>
<kwd lng="es"><![CDATA[ectoparásitos]]></kwd>
<kwd lng="es"><![CDATA[tasa de respiración]]></kwd>
<kwd lng="es"><![CDATA[factores climáticos]]></kwd>
<kwd lng="es"><![CDATA[cebú]]></kwd>
<kwd lng="es"><![CDATA[animales de carne]]></kwd>
<kwd lng="en"><![CDATA[agroforestry]]></kwd>
<kwd lng="en"><![CDATA[ectoparasites]]></kwd>
<kwd lng="en"><![CDATA[respiration rate]]></kwd>
<kwd lng="en"><![CDATA[climatic factors]]></kwd>
<kwd lng="en"><![CDATA[zebu]]></kwd>
<kwd lng="en"><![CDATA[meat animals]]></kwd>
</kwd-group>
</article-meta>
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