<?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>S1659-13212017000300657</article-id>
<article-id pub-id-type="doi">10.15517/ma.v28i3.26216</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Degradabilidad ruminal de la alfalfa en la zona oriental del Valle Central de Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Ruminal degradability of alfalfa in the Costa Rica&#8217;s Central Valley, Eastern zone]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Boschini-Figueroa]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chacón-Hernández]]></surname>
<given-names><![CDATA[Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Facultad de Ciencias Agroalimentarias Estación Experimental Alfredo Volio Mata]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Facultad de Ciencias Agroalimentarias Estación Experimental Alfredo Volio Mata]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CR</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>28</volume>
<numero>3</numero>
<fpage>657</fpage>
<lpage>666</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212017000300657&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212017000300657&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212017000300657&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo del trabajo fue evaluar en bovinos de leche, el potencial de degradabilidad ruminal de cuatro variedades de alfalfa ( Medicago sativa ) desarrolladas en la República Argentina. La investigación se llevó a cabo en la Estación Experimental Alfredo Volio Mata, localizada en la provincia de Cartago, Costa Rica; la zona presenta una temperatura promedio de 17,9 °C, una altura de 1542 msnm y precipitación de 1465,9 mm anuales distribuidos principalmente de mayo a noviembre. El muestreo fue realizado durante la época lluviosa del año 2014, por medio de la cosecha de alfalfa, a nivel del suelo, de muestras de las variedades Mora, Patricia, Victoria y Súper Monarca, a edades de cosecha de 28, 35, 42, 49, 56 y 63 días de rebrote; todas las muestras fueron secadas, molidas e incubadas por duplicado en dos vacas Jersey-Reyna fistuladas ruminalmente, por 0, 3, 6, 12, 24 y 48 horas. Los resultados fueron analizados mediante el algoritmo de Marquardt con el programa estadístico SAS. Solo hubo diferencias estadísticamente significativas (p&lt;0,05) para las fracciones solubles y la tasa de degradación según la edad de cosecha, con valores de fracción soluble, potencialmente degradable y tasa de degradación entre 35,34%-44,65%, 36,46%-39,96% y 0,0734/h-0,1176/h, respectivamente. Asimismo, se obtuvieron porcentajes de degradabilidad efectiva entre 59,06%-67,09%, con una tasa de paso de 6%/h, según el tiempo de rebrote. Según los resultados obtenidos, las variedades analizadas de M. sativa mostraron un forraje digestible y con potencial para uso en animales altamente productivos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of this work was to evaluate in dairy cows, the potential of ruminal degradability of four alfalfa ( Medicago sativa ) varieties developed in Argentina. The research was carried out in the Alfredo Volio Mata Experimental Station, located in the province of Cartago, Costa Rica; the area has a mean temperature of 17.9°C; a height of 1542 masl, and 1465.9 mm of rain evenly distributed between the months of May and November. Sampling was performed during 2014&#8217;s rainy season with ground level harvest of alfalfa, with samples of the varieties of Mora, Patricia, Victoria and Super Monarca, with harvest age of 28, 35, 42, 49, 56 and 63 days; all samples were dried, minced and incubated by duplicate on two Jersey-Reyna ruminally fistulated cows, for 0, 3, 6, 12, 24 and 48 hours. The results were analyzed through the Marquardt algorithm with the SAS software. Statical differences were only found between soluble fraction and degradation rate (p&lt;0.05) according to harvest ages, with values of soluble, potentially degradable and degradation rate of 35.34%-44.65%, 36.46%-39.96% and 0.0734/h-0.1176/h, respectively. Likewise, effective degradability percentages of 59.06%-67.09%, with passage rates of 6%/h, according to harvest ages were obtained. Given the obtained results, the analyzed varieties of M. sativa showed a digestible forage, which could be used for the feeding of highly production animals.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Medicago sativa]]></kwd>
<kwd lng="es"><![CDATA[nutrición de rumiantes]]></kwd>
<kwd lng="es"><![CDATA[digestibilidad in situ]]></kwd>
<kwd lng="en"><![CDATA[Medicago sativa]]></kwd>
<kwd lng="en"><![CDATA[ruminant nutrition]]></kwd>
<kwd lng="en"><![CDATA[in situ degradability]]></kwd>
</kwd-group>
</article-meta>
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