<?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>S2007-90282024000400003</article-id>
<article-id pub-id-type="doi">10.19136/era.a11niv.4034</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Características químicas y fermentativas in vitro de Cynodon nlemfuensis Vanderyst y Guazuma ulmifolia Lam]]></article-title>
<article-title xml:lang="en"><![CDATA[In vitro Chemical and Fermentative Characteristics of Cynodon nlemfuensis Vanderyst and Guazuma ulmifolia Lam]]></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"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso Bran]]></surname>
<given-names><![CDATA[Reynerio Adrián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Aguilar]]></surname>
<given-names><![CDATA[Jonathan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerra-Medina]]></surname>
<given-names><![CDATA[Cándido Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-Espinoza]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montañez-Valdez]]></surname>
<given-names><![CDATA[Oziel Dante]]></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[Villaflores Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UNACH Facultad de Ciencias Agronómicas ]]></institution>
<addr-line><![CDATA[Villaflores Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Tuxtla Chico Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario del Sur ]]></institution>
<addr-line><![CDATA[Ciudad Guzmán Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>11</volume>
<numero>spe4</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282024000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282024000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282024000400003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo consistió en evaluar in vitro las características químicas y fermentativas de mezclas de pasto Estrella (Cynodon nlemfuensis; Cn) con niveles crecientes de guácima (Guazuma ulmifolia; Gu). En cuatro biodigestores con una capacidad de 2 000 mL cada uno, a los cuales se añadió 200 mL de un medio de cultivo más 20 g de los tratamientos: T1: 20 g Cn (control); T2: 16 g Cn + 4.0 g Gu; T3: 12 g Cn + 8 g Gu; T4: 8 g Cn + 12 g Gu. Los tratamientos se inocularon con 20 mL de líquido ruminal y se mantuvieron a 38 °C durante 24, 48, 72 y 96 h. El diseño experimental fue un completamente al azar con una prueba de medias Tukey. En las muestras se evaluaron las producciones de biogás, metano (CH4), ácidos grasos volátiles (AGV), concentración de bacterias totales (BT) y bacterias celulolíticas (BC), además del pH. La inclusión de guácima en la mezcla permitió la reducción de paredes celulares fermentables, que resultó en menor producción de CH4. Hubo cambios en el patrón de fermentación de AGV, con disminución en la relación acetato:propionato. El tratamiento control tuvo la mayor concentración de BC, sin diferencias entre los tratamientos en cuanto a las BT. Aunque el pH estuvo por arriba de 6.0, no comprometió la estabilidad en los medios de cultivo. La presencia de guácima en las fermentaciones in vitro contribuyó a mitigar la producción de biogás y CH4, y mejoró la producción de ácido propiónico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective consisted into the evaluation in vitro about the chemical and ferment characteristics mixing of the Estrella grass (Cynodon nlemfuensis; Cn) with an increase level of guacima (Guazuma ulmifolia; Gu). Four biodigester with a capacity fill of 2 000 mL individually, in which one, it was added 200 mL of mid cultive plus the treatments: T1: 20 g Cn (control); T2: 16 g Cn + 4.0 g Gu; T3: 12 g Cn + 8 g Gu; T4: 8 g Cn + 12 g Gu. Treatments were inoculated with 20 mL of ruminal liquid, and they were kept during, 24, 48, 72 and 96 h in a temperature of 38 °C. The experiment design was a complement randomly measure with Tukey mean comparison test. In the results they were evaluated the productions of biogas, methane (CH4), volatile fatty acids (VFA), total bacterial concentrations (TBC) so the cellulolytic bacteria (CB), including the pH. The inclusion on guacima in the mixing allowed the reduction of fermentable cell walls, which result with less production of CH4. There were changes in the fermentation patrons of VFA, decreasing on the relation of acetate: propionate. The control treatment had the highest concentration of CB, without differences in the treatments based on the CBT. Although the pH which was up 6.0, it did not compromise the stability of the cultivation medias. The presence of guácima in the fermentations in vitro were contributed to mitigate the production of biogas and CH4, which get better the production of propionic acid.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Biogás]]></kwd>
<kwd lng="es"><![CDATA[fermentación]]></kwd>
<kwd lng="es"><![CDATA[forrajes]]></kwd>
<kwd lng="es"><![CDATA[ganadería]]></kwd>
<kwd lng="es"><![CDATA[trópico]]></kwd>
<kwd lng="en"><![CDATA[Biogas]]></kwd>
<kwd lng="en"><![CDATA[fermentation]]></kwd>
<kwd lng="en"><![CDATA[forage]]></kwd>
<kwd lng="en"><![CDATA[livestock]]></kwd>
<kwd lng="en"><![CDATA[tropic]]></kwd>
</kwd-group>
</article-meta>
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