<?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>S2007-90282023000200002</article-id>
<article-id pub-id-type="doi">10.19136/era.a10n2.3545</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Nivel de proteína y energía en la fermentación in vitro de dietas para borregos]]></article-title>
<article-title xml:lang="en"><![CDATA[Level of protein and energy on the in vitro fermentation of diets for lambs]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[De la Rosa-Zariñana]]></surname>
<given-names><![CDATA[Asael Edem]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miranda-Romero]]></surname>
<given-names><![CDATA[Luis Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Hernández]]></surname>
<given-names><![CDATA[Pedro Arturo]]></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[Elmasry]]></surname>
<given-names><![CDATA[Amr]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo Posgrado en Producción Animal Departamento de Zootecnia]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Posgraduados Posgrado en Ciencias Agrícolas en el Trópico ]]></institution>
<addr-line><![CDATA[Heroica Cárdenas Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Menoufia University Botany Department ]]></institution>
<addr-line><![CDATA[Shibin El-Kom ]]></addr-line>
<country>Egypt</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<volume>10</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282023000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282023000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282023000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen. La eficiencia de utilización ruminal del alimento, entre otras razones, depende del nivel de energía y proteína contenida en el mismo. Con el objetivo de determinar el efecto del nivel de energía y proteína del alimento en la digestibilidad (DIVMS72h), el volumen (Vm), tasa (S) y fase Lag (L) de la producción de gas; las fracciones de fermentación rápida (FFR), media (FFM) y lenta (FFL); la producción de metano, el indicador del potencial de calentamiento global (IPCG) e índice de impacto ambiental (IIA), se formularon cinco dietas de acuerdo con el nivel de energía metabolizable (EM, Mcal kg-1 MS) y proteína cruda (PC, %); BB; 2.6 y 13.8, MM; 2.8 y 16, AA; 3.0 y 17.2, AB; 2.8 y 14.5, BA; 2.6 y 17.2 en EM y PC. La S fue superior (p &lt; 0.05) en las dietas AA y AB, el Vm fue menor (p &lt; 0.05) para la dieta BA. La dieta AA tuvo las mayores (p &lt; 0.05) FFR y FFM. Las dietas BA y BB tuvieron la mayor (p &lt; 0.05) FFL, pero menor DIVMS72h (p &lt; 0.05). Respecto al impacto ambiental, la dieta BB produjo la mayor proporción (p &lt; 0.05) de CH4, IPCG e IIA. Se concluye que las dietas con mayor contenido de carbohidratos no estructurales tienen mejor cinética fermentativa y digestibilidades, también generan menores proporciones de CH4, IPCG y IIA, estos últimos pueden usarse como indicadores del impacto ambiental ya que consideran el CO2 y CH4 producidos por los consorcios microbianos del rumen.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract. The ruminal utilization efficiency of the feed, among other rea- sons, depends on the level of energy and protein it contains. To determine the effect of the energy and protein level of the feed on digestibility (IVMD72h), volume (Vm), rate (S) and Lag phase (L) of gas production; the fast (FFR), medium (MFF) and slow (SFF) fermentation fractions; methane production, the global warming potential indicator (GWPI) and environmental impact index (EII), five diets were formulated according to the level of metabolizable energy (ME, Mcal kg-1 DM) and crude protein (PC , %); BB; 2.6 and 13.8, MM; 2.8 and 16, AA; 3.0 and 17.2, AB; 2.8 and 14.5, BA; 2.6 and 17.2 on EM and PC. The S was higher (p &lt; 0.05) in the AA and AB diets, the Vm was lower (p &lt; 0.05) for the BA diet. The AA diet had the highest (p &lt; 0.05) FFR and FFM. The BA and BB diets had the highest (p &lt; 0.05) FFL, but the lowest IVMD72h (p &lt; 0.05). Regarding the environmental impact, the BB diet produced the highest proportion (p &lt; 0.05) of CH4, GWPI and EII. It is concluded that diets with a higher content of non-structural carbohydrates have better fermentative kinetics and digestibilities, they also generate lower proportions of CH4, IPCG and EII, the latter can be used as indicators of environmental impact since they consider the CO2 and CH4 produced by the consortia. rumen microbials.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Digestibilidad]]></kwd>
<kwd lng="es"><![CDATA[engorda intensiva]]></kwd>
<kwd lng="es"><![CDATA[fracciones fermentables]]></kwd>
<kwd lng="es"><![CDATA[impacto ambiental]]></kwd>
<kwd lng="es"><![CDATA[técnica de producción de gas]]></kwd>
<kwd lng="en"><![CDATA[Digestibilit]]></kwd>
<kwd lng="en"><![CDATA[intensive fattening]]></kwd>
<kwd lng="en"><![CDATA[fermentable fractions]]></kwd>
<kwd lng="en"><![CDATA[environmental impact]]></kwd>
<kwd lng="en"><![CDATA[and gas production technique]]></kwd>
</kwd-group>
</article-meta>
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