<?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>S1659-13212017000100001</article-id>
<article-id pub-id-type="doi">10.15517/am.v28i1.22034</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Aceites vegetales sobre ácidos grasos y producción de metano in vitro en vacas lecheras]]></article-title>
<article-title xml:lang="en"><![CDATA[Vegetable oils on in vitro fatty acids and methane production in dairy cows]]></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[Sincelejo&#8211;Sucre ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Caldas Facultad de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[Manizales &#8211; Caldas ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>CO</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<volume>28</volume>
<numero>1</numero>
<fpage>1</fpage>
<lpage>18</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212017000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212017000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212017000100001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenAceites vegetales sobre ácidos grasos y producción de metano in vitro en vacas lecheras . El objetivo de este trabajo fue evaluar el efecto de la adición de aceites vegetales en dietas representativas de vacas lecheras bajo pastoreo, sobre los ácidos grasos, fermentación ruminal y producción de metano in vitro . La investigación se desarrolló en el laboratorio NUTRILAB&#8211;GRICA, perteneciente a la Facultad de Ciencias Agrarias, Universidad de Antioquia, Medellín, Colombia, en agosto del 2013. Se utilizó la técnica de producción de gas in vitro. En cuatro dietas (dos de monocultivo en  Cynodon plectostachyus y dos de sistema silvopastoril intensivo con Leucaena leucocephala ), se evaluó la adición de tres aceites vegetales (girasol, lino y palma) a nivel del 2 y 4% de la MS, en un diseño completamente al azar con arreglo factorial de 4x3x2. En todas las dietas, la suplementación con aceite de girasol aumentó el contenido de ácido linoleico (C18:2 c9,12), ácido linoleico conjugado (ALC-c9t11) y ácido transvaccénico (ATV, C18:1 t11) después de la fermentación (p&lt;0,0001), redujo en 2,4 y 0,9% la digestibilidad de la MS con respecto a aceite de palma (p&lt;0,05) y lino (p&gt;0,05). Ningún aceite afectó la cinética de fermentación, pH, total de ácidos grasos volátiles (AGV), proporción de AGV, ni la producción de metano.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractVegetable oils on in vitro fatty acids and methane production in dairy cows. The aim of this study was to evaluate the effect of the addition of vegetable oils to representative diets of dairy cows under grazing, on the in vitro fatty acids, ruminal fermentation and methane production. The research was conducted in the laboratory NUTRILAB-GRICA, belonging to the Faculty of Agricultural Sciences, University of Antioquia, Medellin, Colombia, in August 2013. The technique of in vitro gas production was used. In four diets (two Cynodon plectostachyus monoculture and two intensive silvopastoral system with Leucaena leucocephala ), the addition of three vegetable oils (sunflower, linseed and palm) at 2 and 4% of MS was assessed using a factorial design completely random 4x3x2. In all diets, supplementation with sunflower oil increased the content of linoleic acid (C18: 2 c9, 12), conjugated linoleic acid (CLA-c9t11 ) and transvaccénico acid (ATV, C18:1 t11) after fermentation (p&lt;0.0001), decreased by 2,4 and 0.9% DM digestibility regarding palm oil (p&lt;0.05) and linseed oil (p&gt;0.05). No oil affected fermentation kinetics, pH, total of volatile fatty acid (VFA), VFA ratio or methane production.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ácido linoleico conjugado]]></kwd>
<kwd lng="es"><![CDATA[ácido transvaccénico]]></kwd>
<kwd lng="es"><![CDATA[fermentación ruminal]]></kwd>
<kwd lng="es"><![CDATA[ganado lechero en pastoreo]]></kwd>
<kwd lng="es"><![CDATA[sistema silvopastoril]]></kwd>
<kwd lng="en"><![CDATA[conjugated linoleic acid]]></kwd>
<kwd lng="en"><![CDATA[trans vaccenic acid]]></kwd>
<kwd lng="en"><![CDATA[ruminal fermentation]]></kwd>
<kwd lng="en"><![CDATA[dairy cattle under grazing]]></kwd>
<kwd lng="en"><![CDATA[silvopastoral system]]></kwd>
</kwd-group>
</article-meta>
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