<?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>S2007-90282021000200020</article-id>
<article-id pub-id-type="doi">10.19136/era.a8n2.2976</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Partición de la energía bruta consumida y el aporte de energía metabolizable en bovinos F1]]></article-title>
<article-title xml:lang="en"><![CDATA[Partitioning of gross energy intake and metabolizable energy supply in bovines F1]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Carrillo]]></surname>
<given-names><![CDATA[María Fernanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montelongo-Pérez]]></surname>
<given-names><![CDATA[Hugo Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Ronquillo]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo-Gallegos]]></surname>
<given-names><![CDATA[Epigmenio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castelán-Ortega]]></surname>
<given-names><![CDATA[Octavio Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Coyoacán Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma del Estado de México Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Toluca Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>8</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282021000200020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282021000200020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282021000200020&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se estimó la partición de la energía bruta consumida (EBi) por novillonas, la densidad energética y metabolicidad de la dieta (qm), y el factor de partición de la energía hacia metano (Ym), por la técnica de cámaras de respiración de circuito abierto. Se utilizaron cuatro novillonas de 206 ± 39.7 kg de peso vivo y 12 ± 0.93 meses de edad; distribuidas en un diseño completamente al azar y dos dietas: dieta A con 74% de ensilado de maíz + 26% de concentrado y dieta B con 100% de ensilado de maíz. Se utilizó una prueba de t para el análisis de resultados. El consumo de materia seca (CMS), digestibilidad, factor Ym y el rendimiento de metano g kg&#8722;1 de CMS, para ambas dietas fue diferente (P &lt; 0.05). Se logró estimar la partición de la EBi, la densidad energética y los factores Ym y qm de la dieta.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The partition of the gross energy intake (GEi) by heifers, the energy density, metabolicity of the diet (qm), and the Ym factor were estimated, by the open circuit respiration chamber technique. Four heifers of 206 ± 39.7 kg of live weight and 12 ± 0.93 months of age were used in a completely randomized design. The heifers were randomly assigned to two diets: Diet A consisted of 74% corn silage + 26% commercial concentrate and diet B 100% corn silage. A t-test was used for analysis of results. Dry matter intake (DMI), digestibility of the DM, Ym factor and methane yield (CH4 g kg&#8722;1 DMI) for both diets were different (P &lt; 0.05). In the present study we were able to estimate the partitioning of the GE consumed by the experimental animals; as well as the energy density, the Ym and qm factors of the diet.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Consumo de materia seca]]></kwd>
<kwd lng="es"><![CDATA[digestibilidad]]></kwd>
<kwd lng="es"><![CDATA[factor Ym]]></kwd>
<kwd lng="es"><![CDATA[metabolicidad]]></kwd>
<kwd lng="es"><![CDATA[metano]]></kwd>
<kwd lng="en"><![CDATA[Digestibility]]></kwd>
<kwd lng="en"><![CDATA[dry matter intake]]></kwd>
<kwd lng="en"><![CDATA[metabolicity]]></kwd>
<kwd lng="en"><![CDATA[methane]]></kwd>
<kwd lng="en"><![CDATA[Ym Factor]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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