<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792020000300425</article-id>
<article-id pub-id-type="doi">10.28940/terra.v38i2.628</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Producción de metano y bióxido de carbono in vitro de pastos tropicales de la costa de Oaxaca, México]]></article-title>
<article-title xml:lang="en"><![CDATA[In vitro methane and carbon dioxide production of tropical grasses of the coast of Oaxaca, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camacho-Escobar]]></surname>
<given-names><![CDATA[Marco Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galicia-Jiménez]]></surname>
<given-names><![CDATA[Mónica Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Bernal]]></surname>
<given-names><![CDATA[Edgar Iván]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ávila-Serrano]]></surname>
<given-names><![CDATA[Narciso Ysac]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Garrido]]></surname>
<given-names><![CDATA[Serafín Jacobo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,aff1  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto de Genética  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto de Ecología  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad del Mar  ]]></institution>
<addr-line><![CDATA[San Pedro Mixtepec Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>38</volume>
<numero>2</numero>
<fpage>425</fpage>
<lpage>434</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792020000300425&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792020000300425&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792020000300425&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los pastos tropicales poseen baja concentración de proteína cruda y mayor fibra detergente neutra. Los pastos fermentados en el rumen, presentan diferentes valores de digestibilidad, concentración de ácidos grasos volátiles (AGV), producción de metano (CH4) y bióxido de carbono (CO2). Objetivo: determinar la composición química, caracterizar la fermentación y estimar la producción de CH4 y CO2 in vitro en pastos tropicales de Oaxaca. Materiales y métodos. Los pastos (0.5 g de materia seca): Cynodon nlemfuensis, Andropogon gayanus, Penissetum purpureum cv. Taiwán Morado, Penissetum purpureum cv. Maralfalfa y Panicum maximum, fueron incubados con 45 mL de medio para microorganismos anaerobios, y depositados en viales de vidrio de 100 mL mantenidos en condiciones anaerobias con CO2. Los pastos fueron inoculados con cinco mL de fluido ruminal de bovino e incubados a 39 °C durante 72 h. A las 6, 12, 24, 48 72 h se determinó la producción de biogás y la población de microorganismos. La concentración de AGV, pH y degradación de la materia seca in vitro (DIVMS) se determinaron a 72 h. A 24, 48 y 72 h se midió la producción de CH4 y CO2. Las variables se evaluaron mediante un diseño completamente aleatorizado utilizando cinco repeticiones por tratamiento, la comparación de medias se realizó mediante la prueba de Tukey. Cynodon nlemfuensis tuvo el mayor contenido de proteína cruda (P = 0.05). Las poblaciones de bacterias celulolíticas presentaron menor conteo en Andropogon gayanus así como en Panicum máximum (P &lt; 0.05). Cynodon nlemfuensis, Andropogon gayanus y Pennisetum purpureum cv. Taiwán Morado presentaron menores concentraciones de acetato (P &lt; 0.05), Pannicum maximum tuvo mayor concentración de propionato (P &lt; 0.05). Pennisetum purpureum cv. Maralfalfa presentó la mayor DIVMS y produjo menor volumen de CH4 (P &lt; 0.05), Cynodon nlemfuensis y Pannicum maximum produjeron menores volúmenes de CO2 (P &lt; 0.05).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: Tropical grasses have different chemical composition; when they are fermented in rumen, they show different values in digestibility, volatile fatty acid concentration (VFA), and methane (CH4) and carbon dioxide (CO2) production. The objective of this study was to determine the chemical composition, characterize fermentation, and estimate CH4 and CO2 emissions in vitro in tropical grasses of Oaxaca. For the experiment, 0.5 g of dry matter of the grasses Cynodon nlemfuensis, Andropogon gayanus, Pennisetum purpureum cv. Taiwan Morado, Pennisetum purpureum cv. Maralfalfa and Panicum maximum were incubated with 45 mL of culture medium for anaerobic microorganisms and deposited in 100 mL glass vials with CO2 flow. The grasses were inoculated with 5 mL of rumen fluid and incubated at 39 °C for 72 h. Biogas production and microorganism population were determined at 6, 12, 24, 48, and 72 h. Volatile fatty acid (VFA) concentrations, pH and in vitro dry matter degradability (IVDMD) were determined at 72 h. CH4 and CO2 emissions were estimated at 24, 48, and 72 h. The response variables were evaluated by a completely randomized design with five replicates per treatment; the comparison of means was made with Tukey&#8217;s test. C. nlemfuensis had the highest (P &lt; 0.05) crude protein content. The cellulolytic bacterial population was lower (P &lt; 0.05) in Andropogon gayanus and Panicum maximum. Cynodon nlemfuensis, Andropogon gayanus and Pennisetum purpureum cv. Taiwan Morado had lower (P &lt; 0.05) acetate concentrations; Panicum maximum had higher (P &lt; 0.05) propionate concentration. Pennisetum purpureum cv. Maralfalfa showed the highest (P &lt; 0.05) IVDMD and produced the lowest (P &lt; 0.05) CH4 volumes; Cynodon nlemfuensis and Panicum maximum produced lower CO2 volumes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[degradabilidad in vitro]]></kwd>
<kwd lng="es"><![CDATA[fermentación]]></kwd>
<kwd lng="es"><![CDATA[gramíneas]]></kwd>
<kwd lng="es"><![CDATA[producción de GEI]]></kwd>
<kwd lng="en"><![CDATA[degradability]]></kwd>
<kwd lng="en"><![CDATA[fermentation]]></kwd>
<kwd lng="en"><![CDATA[grasses]]></kwd>
<kwd lng="en"><![CDATA[GHG production]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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