<?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>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282018000300563</article-id>
<article-id pub-id-type="doi">10.19136/era.a5n15.1560</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto del nivel de urea del sacchapulido sobre la degradación del forraje elefante (Pennisetum purpureum)]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of the urea level of sacchapulido on the degradation of elephant grass (Pennisetum purpureum)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Juárez]]></surname>
<given-names><![CDATA[Jesús Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Villamil]]></surname>
<given-names><![CDATA[Luis Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Izquierdo-Reyes]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Cabrera]]></surname>
<given-names><![CDATA[Carlos Rubén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Martínez]]></surname>
<given-names><![CDATA[Germán David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aranda-Ibañez]]></surname>
<given-names><![CDATA[Emilio Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Sánchez]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Elías-Iglesias]]></surname>
<given-names><![CDATA[Arabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[H. Cárdenas Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Metropolitana Unidad Xochimilco Departamento de Producción Agrícola y Animal]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto de Ciencia Animal  ]]></institution>
<addr-line><![CDATA[ La Habana]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>5</volume>
<numero>15</numero>
<fpage>563</fpage>
<lpage>571</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282018000300563&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282018000300563&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282018000300563&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se evaluó el efecto del nivel de urea sobre la degradación del pasto Elefante (Pennisetum purpureum) en el suplemento fermentado, Sacchapulido (SP). Se determinó el pH, N-NH3, la degradación in situ (DI) y efectiva (DE), así como, los parámetros cinéticos de materia seca (MS), FDN y FDA del forraje. Se utilizaron cinco bovinos fistulados en rumen en un diseño cuadro Latino 5x5. La DE indicó que los suplementos que tienen entre 0.5 y 1.0% de urea, aportaron un 10% más de biomasa por el aumento de tamaño de la fracción potencialmente degradable (PD) del alimento, tanto en la FDN, como en el contenido celular. Debido al costo de la urea, se recomienda el uso del SP con 0.5% de urea.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The effect of the urea level of the fermented supplement Sacchapulido (SP) on the degradation of elephant grass (Pennisetum purpureum) was evaluated. The pH, N-NH3 and in situ and effective degradation (ID and ED respectively) were determined, as well as the kinetic parameters of dry matter (DM), NDF and ADF of the forage. Five fistulated bovines were used in a 5 x 5 Latin square design. The standard deviation indicated that the supplements have between 0.5 and 1.0% urea; they contributed 10% more biomass due to the increase in size of the potentially degradable fraction of the feed, both in the NDF and cellular content. Due to the cost of urea, the use of SP with 0.5% urea is recommended.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fermentación ruminal]]></kwd>
<kwd lng="es"><![CDATA[fracción de fibra]]></kwd>
<kwd lng="es"><![CDATA[caña de azúcar]]></kwd>
<kwd lng="es"><![CDATA[fermentación en estado sólido]]></kwd>
<kwd lng="en"><![CDATA[Ruminal fermentation]]></kwd>
<kwd lng="en"><![CDATA[fiber fraction]]></kwd>
<kwd lng="en"><![CDATA[sugarcane]]></kwd>
<kwd lng="en"><![CDATA[solid-state fermentation]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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