<?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>0122-0268</journal-id>
<journal-title><![CDATA[Revista MVZ Córdoba]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.MVZ Cordoba]]></abbrev-journal-title>
<issn>0122-0268</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Córdoba - Facultad de Medicina Veterinaria y Zootecnia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-02682018000306788</article-id>
<article-id pub-id-type="doi">10.21897/rmvz.1368</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[In vitro production of gas methane by tropical grasses]]></article-title>
<article-title xml:lang="es"><![CDATA[Produccion in vitro de gas metano por gramineas forrajeras tropicales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ley de Coss]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerra-Medina]]></surname>
<given-names><![CDATA[Cándido]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montañez-Valdez]]></surname>
<given-names><![CDATA[Oziel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara H]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pinto R]]></surname>
<given-names><![CDATA[René]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Gutiérrez]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Chiapas Facultad de Ciencias Agronómicas ]]></institution>
<addr-line><![CDATA[Chiapas ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación del Pacifico Sur  ]]></institution>
<addr-line><![CDATA[Chiapas ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario del Sur ]]></institution>
<addr-line><![CDATA[Jalisco ]]></addr-line>
<country>Mexico</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>23</volume>
<numero>3</numero>
<fpage>6788</fpage>
<lpage>6798</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-02682018000306788&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-02682018000306788&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-02682018000306788&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Objective.  Estimate the production of methane (CH4) by tropical grasses fermented in vitro.  Materials and methods.  A sample of 20 g dry matter of Cynodon nlemfuensis, Hyparrhenia rufa, Megathyrsus maximus and Digitaria swazilandensis plus 200 ml of culture medium were plated in triplicate flasks sterile stainless steel with CO2 flux, inoculated with 20 ml of ruminal fluid bovine, incubated at 38 °C for 24, 48, 72 and 96 h. Total production of gas, CH4, volatile fatty acids, and pH were evaluated in a completely randomized design with three replicates per treatment and comparison of means with Tukey; the concentration of total and cellulolytic bacteria were analyzed with the Kruskal-Wallis, and the GLM procedure independent data Wilcoxon rank.  Results. H. rufa and D. swazilandensis both had the lowest total gas production (p&lt;0.05), while D. swazilandensis had lower production of CH4, increased production of propionic acid (p&lt;0.05) and lower pH 96 hours of incubation (p&lt;0.05). D. swazilandensis showed greater efficiency in energy production due to reduced production of CH4 and increased propionate production. The concentration of total bacteria was similar between treatments (p&gt;0.05), while the concentration of cellulolytic bacteria was lower in C. nlemfuensis y D. swazilandensis when 96 of incubation (p&lt;0.05).  Conclusions.  The Digitaria swazilandensis, showed favorable conditions to have lower total methane and total gas production.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Objetivo.  Estimar la producción de metano (CH4) por gramíneas tropicales fermentadas in vitro.  Materiales y métodos.  Una muestra de 20 g de materia seca de Cynodon nlemfuensis, Hyparrhenia rufa, Megathyrsus maximus y Digitaria swazilandensis más 200 ml de medio de cultivo se depositaron por triplicado en frascos de acero inoxidable estériles con flujo de CO2, se inocularon con 20 ml de líquido ruminal de bovino e incubaron a 38 °C por 24, 48, 72 y 96 h. Se evaluó producción total de gas, CH4, ácidos grasos volátiles, y pH en un diseño completamente al azar con tres repeticiones por tratamiento y la comparación de medias con Tukey; la concentración de bacterias totales y celulolíticas, se analizaron con la prueba de Kruskal-Wallis, y el procedimiento GLM con datos de rangos independientes de Wilcoxon.  Resultados. H. rufa y D. swazilandensis tuvieron la menor producción total de gases (p&lt;0.05), mientras que D. swazilandensis tuvo menor producción de CH4, mayor producción de ácido propónico (p&lt;0.05) y menor pH a las 96 horas de incubación (p&lt;0.05). D. swazilandensis mostró mayor eficiencia en la producción de energía por la menor producción de CH4 y mayor producción de propionato. La concentración de bacterias totales fue similar entre tratamientos (p&gt;0.05), mientras que la concentración de bacterias celulolíticas fue menor en C. nlemfuensis y D. swazilandensis a la hora 96 de incubación (p&lt;0.05).  Conclusiones.  La Digitaria swazilandensis, mostró condiciones favorables para tener menor producción total de metano y gases totales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Grasses]]></kwd>
<kwd lng="en"><![CDATA[in vitro digestibility]]></kwd>
<kwd lng="en"><![CDATA[methane]]></kwd>
<kwd lng="en"><![CDATA[(Source: Tesauro de la biblioteca nacional de agricultura)]]></kwd>
<kwd lng="es"><![CDATA[Digestibilidad in vitro]]></kwd>
<kwd lng="es"><![CDATA[gramíneas]]></kwd>
<kwd lng="es"><![CDATA[metano (Fuente: Tesauro de la biblioteca nacional]]></kwd>
</kwd-group>
</article-meta>
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