<?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>S1659-13212017000100002</article-id>
<article-id pub-id-type="doi">10.15517/am.v28i1.22816</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Grasa y ácidos grasos en leche de vacas pastoreando, en cuatro sistemas de producción]]></article-title>
<article-title xml:lang="en"><![CDATA[Fat and fatty acids of cow milk grazing in four production systems]]></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>19</fpage>
<lpage>42</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212017000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212017000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212017000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenGrasa y ácidos grasos en leche de vacas pastoreando, en cuatro sistemas de producción. El objetivo de este trabajo fue evaluar el efecto de la dieta, número de partos y tercio de lactancia sobre el porcentaje de grasa, la concentración de ácido linoleico conjugado (ALC-c9t11), transvaccénico (ATV-C18:1t11) y otros ácidos grasos (AG) insaturados en la leche de vacas pastoreando en cuatro sistemas de producción. El trabajo se realizó de mayo a diciembre del 2012 en diez ganaderías colombianas, representativas de los sistemas de producción lechería tropical (LT) y doble propósito (DP) con/sin sistema silvopastoril intensivo de leucaena (SSPi). En cada ganadería se tomaron tres muestras individuales de leche, de cinco vacas (día 62 ± 22, día 147 ± 22 y día 227 ± 22 de lactancia), conjuntamente se estimó el consumo de suplemento y de forraje, y se determinaron AG en estos. Cada sistema de producción se analizó independientemente. El contenido de grasa en leche fue afectado por el tercio de lactancia (p&lt;0,05) en LTSSPi y DPSSPi, presentando el primer tercio el menor valor. ALC-c9t11 en la leche varió entre 1,02 a 2,22%, ATV entre 4,40 a 6,50% y el índice de aterogenicidad entre 1,69 a 2,89. La alta participación de la grasa de los suplementos (51 a 84%) en el total de grasa consumida y su composición, llevó a variaciones en el perfil de AG de la leche en los sistemas LT, LTSSPi y DP. El número de parto y el tercio de lactancia presentaron menor efecto que la dieta.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractFat and fatty acids of cow milk grazing in four production systems. The aim of this work was to evaluate the effect of diet, number of births and stage of lactation on the percentage of milk fat, concentration of conjugated linoleic acid (CLA-c9t11), trans-vaccenic acid (TVA-C18:1t11) and other milk unsaturated fatty acids (FA) of cows grazing in four production systems. This work was carried out from May to December 2012 in ten farms in Colombia, representing tropical dairy production system (LT) and dual purpose production system (DP) with and without intensive silvopastoral system of leucaena (SSPi). Three individual samples of milk from five cows were taken in each farm (day 62 ± 22, day 147 ± 22 and day 227 ± 22 of lactation), at the same time, supplement and forage intake was estimated and FA were determined in these. Each production system was independently analyzed. The milk fat content was affected by the stage of lactation (p&lt;0.05) in LTSSPi and DPSSPi, obtaining the lower value in the first stage of lactation. CLA-c9t11 in the milk ranged between 1.02 and 2.22%, TVA between 4.40 and 6.50% and the atherogenic index between 1.69 and 2.89. The high share of fat supplements (51 to 84%) on total fat consumed and the composition of fat supplements affected the variations of the milk fatty acid profile in LT, LTSSPi and DP systems. Births and stage of lactation had a lower effect than dieting.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ácido linoleico conjugado]]></kwd>
<kwd lng="es"><![CDATA[ácido transvaccénico]]></kwd>
<kwd lng="es"><![CDATA[lechería tropical]]></kwd>
<kwd lng="es"><![CDATA[doble propósito]]></kwd>
<kwd lng="es"><![CDATA[leucaena]]></kwd>
<kwd lng="en"><![CDATA[conjugated linoleic acid]]></kwd>
<kwd lng="en"><![CDATA[trans-vaccenic acid]]></kwd>
<kwd lng="en"><![CDATA[tropical dairy system]]></kwd>
<kwd lng="en"><![CDATA[dual purpose]]></kwd>
<kwd lng="en"><![CDATA[leucaena]]></kwd>
</kwd-group>
</article-meta>
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