<?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>S1659-13212019000200497</article-id>
<article-id pub-id-type="doi">10.15517/am.v30i2.34723</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Perfil lipídico en leche de vacas en pastoreo de gramíneas en el trópico seco colombiano]]></article-title>
<article-title xml:lang="en"><![CDATA[Lipid profile in milk of grazing cows in the colombian dry tropics]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mojica-Rodríguez]]></surname>
<given-names><![CDATA[José Edwin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro-Rincón]]></surname>
<given-names><![CDATA[Edwin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carulla-Fornaguera]]></surname>
<given-names><![CDATA[Juan Evangelista]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lascano-Aguilar]]></surname>
<given-names><![CDATA[Carlos Eduardo]]></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[,Universidad Nacional de Colombia.  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Centro Internacional de Agricultura Tropical (CIAT)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<volume>30</volume>
<numero>2</numero>
<fpage>497</fpage>
<lpage>515</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212019000200497&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212019000200497&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212019000200497&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. La composición de la grasa en la leche bovina tiene relevancia en la salud humana, donde ácidos grasos poliinsaturados como el ácido linoleico conjugado (ALC c9 t11), tienen efectos positivos (anticarcinogénicos, antidiabetogénico). Existen investigaciones sobre efecto de la alimentación de los bovinos en la calidad de la leche en zonas templadas (por encima de 2200 msnm), pero pocas en el trópico bajo colombiano (por debajo de 1500 msnm). Objetivo. El objetivo de este trabajo fue evaluar el efecto de tres gramíneas, Mulato II, Tanzania y Toledo, sobre la producción, composición y perfil lipídico de la leche de vacas gyr x pardo suizo en el primer, segundo y tercer tercio de lactancia. Materiales y métodos. El estudio se llevó a cabo durante mayo y junio de 2013, en el municipio de San Diego, Cesar, Colombia. Se seleccionaron dos grupos de nueve animales (tres vacas en cada tercio de lactancia) y se asignó una vaca de cada tercio de lactancia a cada gramínea en un diseño de cuadrado latino 3 x 3 replicado. Resultados. La producción de leche fue similar (p&gt;0,05) en las gramíneas evaluadas y disminuyó (p&lt;0,05) conforme avanzó la lactancia. La concentración de grasa y proteína en la leche fue mayor (p&lt;0,05) en Tanzania y Mulato II, aunque en el segundo tercio hubo un mayor (p&lt;0,05) contenido de ácidos grasos poliinsaturados respectivamente, en comparación con Toledo. El tercio de lactancia no afectó (p&gt;0,05) la composición de la leche. Se presentó una mayor (p&lt;0,05) concentración de ácido linoleico conjugado y de ácidos poliinsaturados en la grasa de la leche en vacas alimentadas con los pastos Tanzania y Toledo. Conclusión. Alimentar vacas doble propósito con pastos Tanzania y Toledo podría tener efectos positivos en salud humana, debido al perfil lipídico más saludable de la leche producida.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. The composition of fat in bovine milk has relevance in human health, where polyunsaturated fatty acids such as conjugated linoleic acid (ALC c9 t11) have positive effects (anticarcinogenic, antidiabetogenic). There are investigations regarding the effect of bovine feeding on milk quality in temperate zones (above 2200 m.a.s.l.), but few in the Colombian low tropics (below 1500 m.a.s.l.). Objetive. The objective of this work was to evaluate the effect of three grasses Mulato II, Tanzania, and Toledo on production, composition, and lipid panel in the milk of Gyr x Brown Swiss cows in the first-second-and three-third of lactation. Materials and methods. The study was conducted from May to June 2013 in the city council of San Diego, Cesar, Colombia. Two groups of nine animals were selected (three cows in each third lactation stage), and one cow was assigned to each grass in a replicated 3 x 3 Latin Square design. Results. Milk production was similar (p&gt;0.05) in evaluated grasses and decreased (p&lt;0.05) as the lactation advanced. The concentration of milk fat and protein was higher (p&lt;0.05) in Tanzania and Mulato II, although in the second-third there was a higher content (p&lt;0.05) of polyunsaturated acids, compared to Toledo. The lactation trimester did not affect (p&gt;0.05) milk composition. There was higher fed (p&lt;0.05) concentration of conjugated linoleic acid and polyunsaturated fatty acids in milk fat in cows fed with Tanzania and Toledo forage. Conclusion. Feeding dual-purpose cows with Tanzania and Toledo grasses could have positive effects on human health, due to the healthier lipid panel of the milk produced.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ácidos grasos en leche bovina]]></kwd>
<kwd lng="es"><![CDATA[alimentación animal]]></kwd>
<kwd lng="es"><![CDATA[forrajes]]></kwd>
<kwd lng="es"><![CDATA[razas mixtas]]></kwd>
<kwd lng="en"><![CDATA[fatty acids in bovine milk]]></kwd>
<kwd lng="en"><![CDATA[animal feeding]]></kwd>
<kwd lng="en"><![CDATA[forage]]></kwd>
<kwd lng="en"><![CDATA[multiple purpose breeds]]></kwd>
</kwd-group>
</article-meta>
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