<?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>S1659-13212017000200341</article-id>
<article-id pub-id-type="doi">10.15517/ma.v28i2.25643</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Digestión de materia seca, proteína cruda y aminoácidos de la dieta de vacas lecheras]]></article-title>
<article-title xml:lang="en"><![CDATA[Digestion of dry matter, crude protein and amino acids of the diet dairy cows]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Duque-Quintero]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosero-Noguera]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olivera-Ángel]]></surname>
<given-names><![CDATA[Marta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agrarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agrarias ]]></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>08</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<volume>28</volume>
<numero>2</numero>
<fpage>341</fpage>
<lpage>356</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212017000200341&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212017000200341&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212017000200341&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de este trabajo fue determinar la digestión de materia seca (MS), proteína cruda (PC) y aminoácidos (AA) en vacas lecheras. Fueron utilizadas dos vacas canuladas para la medición de la tasa de pasaje (Kp), la degradabilidad ruminal (DR) in situ y la digestibilidad intestinal (DI) por sonda abomasal. Los datos para calcular la Kp fueron analizados con el procedimiento NLIN de SAS, y mediante estadística descriptiva para la DR y DI de la MS, PC y AA del pasto kikuyo (Pennisetum clandestinum), un suplemento comercial y dos fuentes de AA protegidos (metionina protegida (MetP) y lisina protegida (LysP)). Se encontró una Kp y un tiempo medio de retención ruminal de 0,036 h-1 y 27,4 h. Los mayores valores de degradabilidad ruminal de la materia seca y proteína cruda, fueron para el kikuyo (69,0 y 61,8%) y el concentrado (84,7 y 77,2), seguido de MetP (60,2 y 66,7%) y LysP (6,72 y 11,4%). El mayor porcentaje de aminoácidos degradables en el rumen (AADR) fue mayor para el kikuyo y el concentrado, variando entre 58,7 y 68% para el forraje, y 76,1 y 82,9% para el concentrado. La DR de LysP y MetP fue de 11,5 y 65,8%, respectivamente. La digestibilidad intestinal de los aminoácidos (% AANDR) varió entre 42,3 y 77,4% para el kikuyo, y 42,2 y 59,3% para el concentrado. Los valores para los aminoácidos protegidos fueron de 42,1 en LysP y 58,6 para MetP.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The aim of this study was to determine the digestion of dry matter (MS), crude protein (PC) and amino acids (AA) in dairy cows. Two cannulated cows were used for the determination of passage rate (Kp), in situ ruminal degradability (DR) and intestinal digestibility (DI) by abomasal catheter. The data to calculate Kp was analyzed with NLIN procedure by SAS, and descriptive statistics for DR and DI of MS, PC and AA from Kikuyu grass (Pennisetum clandestinum), a commercial supplement and two sources of rumen-protected AA. The study showed a Kp and a ruminal retention time of 0.036 h-1 and 27.4 h. The highest values from DR of MS and CP were from Kikuyu grass (69.0 and 61.8%) and concentrate (84.7 and 77.2%), followed by MetP (60.2 and 66.7%) and LysP (6.72 and 11.4%). The highest percentages of rumen indegradable amino acids (AADR) were from Kikuyu and concentrate, varying between 58.7 and 68% in forage, and 76.1 and 82.9% in the concentrate. The DR was 11.5 and 65.8% in LysP and MetP, respectively. The DI of AA (%AADR) varied between 42.3 and 77.4% for Kikuyu and 42.2 and 59.3% for concentrate. The values for the protected amino acids were 42.1 for LysP and 58.6 for MetP.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[degradabilidad ruminal]]></kwd>
<kwd lng="es"><![CDATA[digestibilidad intestinal]]></kwd>
<kwd lng="es"><![CDATA[metionina protegida]]></kwd>
<kwd lng="es"><![CDATA[lisina protegida]]></kwd>
<kwd lng="es"><![CDATA[tasa de pasaje]]></kwd>
<kwd lng="en"><![CDATA[ruminal degradability]]></kwd>
<kwd lng="en"><![CDATA[intestinal digestibility]]></kwd>
<kwd lng="en"><![CDATA[rumen-protected methionine]]></kwd>
<kwd lng="en"><![CDATA[rumen-protected lysine]]></kwd>
<kwd lng="en"><![CDATA[passage rate]]></kwd>
</kwd-group>
</article-meta>
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