<?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>S1659-13212016000200337</article-id>
<article-id pub-id-type="doi">10.15517/am.v27i2.24386</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Ácidos grasos, fermentación ruminal y producción de metano, de forrajes de silvopasturas intensivas con Leucaena]]></article-title>
<article-title xml:lang="en"><![CDATA[Fatty acids, ruminal fermentation, and methane production, of forage in intensive silvopastures with Leucaena]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prieto-Manrique]]></surname>
<given-names><![CDATA[Esperanza]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Sánchez]]></surname>
<given-names><![CDATA[Julio-Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Angulo-Arizala]]></surname>
<given-names><![CDATA[Joaquín]]></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-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Sucre Facultad de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Caldas Facultad de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agrarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CO</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<volume>27</volume>
<numero>2</numero>
<fpage>337</fpage>
<lpage>352</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212016000200337&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212016000200337&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212016000200337&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenEl objetivo del presente trabajo fue determinar el efecto de los forrajes sobre los ácidos grasos de cadena larga, fermentación ruminal y producción de metano de un sistema silvopastoril intensivo de Leucaena leucocephala. La investigación se desarrolló en el laboratorio NUTRILAB- GRICA, perteneciente a la Facultad de Ciencias Agrarias, de la Universidad de Antioquia, Medellín-Colombia, en julio del 2013. Se utilizó la técnica de producción de gas in vitro, utilizando como sustrato de fermentación las gramíneas (C. plectostachyus y/o M. maximus cv. Tanzania) y leucaena (L. leucocephala), solas o en sus combinaciones, con una relación forraje:concentrado 70:30 y gramínea: leucaena 56:14, para un total de siete tratamientos. No se encontró efecto de los forrajes (p&gt;0,05), sobre el contenido de ácido linoleico conjugado (ALC, C18:2 c9t11) o ruménico en la digesta. La inclusión de 14% de leucaena aumentó el contenido de ácido linoleico (C18:2 c9, 12) y linolénico (C18:3 c9, 12, 15) en el alimento y de transvaccénico (ATV, C18:1 t11), esteárico (C18:0), linoleico y linolénico en la digesta (p&lt;0,05), y no afectó la cinética de fermentación, digestibilidad de la materia seca (MS), pH, total y proporción de ácidos grasos volátiles, ni redujo la producción de metano. Las gramíneas, C. plectostachyus y M. maximus, se comportaron similar en las variables evaluadas (p&gt;0,05). Los sistemas silvopastoriles pueden ser una opción para aumentar los ácidos grasos benéficos en la leche.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractThe aim of this study was to evaluate the effect of forages on the long chain fatty acids, ruminal fermentation, and methane production in an intensive silvopastoral system of Leucaena leucocephala. This study was developed in the laboratory NUTRILAB-GRICA, of the Faculty of Agricultural Sciences, University of Antioquia, Medellin-Colombia, in July 2013. The study was carried out by the in vitro gas production technique using grasses (C. plectostachyus and/or M. maximus cv. Tanzania) and leucaena (L. leucocephala) as substrate of fermentation, alone or with their combinations, with 70:30 forage:concentrate ratio and 56:14 grass: leucaena ratio for a total of seven treatments. No forage effect (p&gt;0,05) on the conjugated linoleic fatty acid content (CLA, C18:2 c9t11) or rumenic acid, in the digesta was found. The inclusion of 14% of leucaena increased the content of linoleic (C18: 2 c9, 12) and linolenic (C18: 3 c9, 12, 15) acids in food and transvaccenic (TVA, C18: 1 t11), stearic (C18: 0), linoleic and linolenic acids in the digesta (p &lt;0.05), and did not affect the kinetics of fermentation, digestibility of dry matter, pH, total and ratio volatile fatty acids, nor reduced methane production. Grasses, C. plectostachyus and M. maximus had a similar behavior in the evaluated variables (p&gt;0.05). Silvopastoral systems could be an option to increase the beneficial fatty acids in milk.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ácido linoleico conjugado]]></kwd>
<kwd lng="es"><![CDATA[ácido transvaccénico]]></kwd>
<kwd lng="es"><![CDATA[Cynodon plectostachyus]]></kwd>
<kwd lng="es"><![CDATA[Megathyrsus maximus cv]]></kwd>
<kwd lng="en"><![CDATA[conjugated linoleic acid]]></kwd>
<kwd lng="en"><![CDATA[transvaccenic acid]]></kwd>
<kwd lng="en"><![CDATA[Cynodon plectostachyus]]></kwd>
<kwd lng="en"><![CDATA[Megathyrsus maximus cv. Tanzania]]></kwd>
<kwd lng="en"><![CDATA[silvopastoral system.]]></kwd>
</kwd-group>
</article-meta>
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