<?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>2007-1124</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. pecuarias]]></abbrev-journal-title>
<issn>2007-1124</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11242018000300588</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v9i3.4490</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[In vitro ruminal degradation of neutral detergent fiber insoluble protein from tropical pastures fertilized with nitrogen]]></article-title>
<article-title xml:lang="es"><![CDATA[Degradación ruminal in vitro de la proteína insoluble en fibra detergente neutro de pastos tropicales fertilizados con nitrógeno]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Juárez Lagunes]]></surname>
<given-names><![CDATA[Francisco Indalecio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pell]]></surname>
<given-names><![CDATA[Alice N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Blake]]></surname>
<given-names><![CDATA[Robert W.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montero Lagunes]]></surname>
<given-names><![CDATA[Maribel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pinos Rodríguez]]></surname>
<given-names><![CDATA[Juan Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Veracruzana Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Veracruz Ver]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Cornell University Animal Science Department ]]></institution>
<addr-line><![CDATA[Ithaca NY]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,INIFAP Campo Experimental La Posta. Medellín ]]></institution>
<addr-line><![CDATA[ Ver]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2018</year>
</pub-date>
<volume>9</volume>
<numero>3</numero>
<fpage>588</fpage>
<lpage>600</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242018000300588&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242018000300588&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242018000300588&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The objective was to determine in vitro the NDF insoluble protein (NDIP) extension and degradation rate of four tropical grasses by the potential effect of N fertilization. The grasses (Andropogon gayanus, Brachiaria brizantha, Cynodon plectostachyus and Megathyrsus maximus) that grow in Mexico were used. Each grass was grown in four plots (5×5 m), fertilized (relationship equivalent to 0 and 100 kg N/ha) and clipped 35 d after the N fertilization. A complete randomized block design with factorial arrangement 4×2, and two replicates per treatment was used, where the factors were grass species and N fertilization. Non-protein nitrogen (NPN), buffer insoluble protein (IP), NDIP and acid detergent insoluble protein (ADIP) were performed. Freeze-dried samples were incubated at 0, 1.5, 3, 6, 9, 12, 24, 48 and 96 h. After fermentation, the CP content of the NDF residues was determined. An exponential equation was used to determine the rate of the NDIP disappearance. There was no detectable interaction between type of grass and fertilization level. The NDIP (as %CP) averaged 35 % with a range of 10 to 60 %. The NDIP variation was primarily due to species. The extent and rates of degradation of the NDIP were 70.6 % and 7.1 %/h respectively, with no N-fertilization effect. The NDIP was degraded faster (P&#8804;0.05) than NDF (7.7 vs 5.0 %/h). These data show that the NDIP is ruminally degraded and that this fraction significantly contributes to the rumen nitrogen supply.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El objetivo fue determinar la tasa y extensión de degradación ruminal in vitro de la proteína insoluble en fibra detergente neutro (NDIP) de pastos tropicales por efecto de la fertilización nitrogenada. Se analizaron los pastos Andropogon gayanus, Brachiaria brizantha, Cynodon plectostachyus y Megathyrsus maximus. Cada pasto se estableció en cuatro parcelas (5×5 m), se fertilizó (a una relación equivalente a 0 y 100 kg N/ha) y se muestreó cada 35 días. El análisis estadístico fue un diseño en bloques completos al azar en un arreglo factorial 4×2 y dos réplicas por tratamiento. Los factores fueron la especie y la fertilización. Se determinó el nitrógeno no proteico, proteína insoluble en buffer, NDIP y proteína insoluble en fibra detergente ácido (ADIP). Las muestras liofilizadas de los pastos se incubaron por 0, 1.5, 3, 6, 9, 12, 24, 48 y 96 h. Después de la fermentación, se determinó PC en la FDN residual y se calculó la tasa de desaparición de NDIP con una ecuación exponencial. No se detectó efecto de interacción entre especie y fertilización. La NDIP (%PC) promedió 35 % con rango de 10 a 60 %. La variación de NDIP fue debido a la especie. La tasa y extensión de la degradación de NDIP fueron del 7.1 %/h y 70.6 % respectivamente, sin efecto de la fertilización. La tasa de degradación fue más rápida (P&#8804;0.05) en la fracción NDIP que en la FDN (7.7 % vs 5.0 %/h). Los resultados muestran que parte del NDIP es degradado en rumen, pudiendo aportar N para la actividad microbiana.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Tropical grasses]]></kwd>
<kwd lng="en"><![CDATA[Degradation kinetics]]></kwd>
<kwd lng="en"><![CDATA[Protein fractions]]></kwd>
<kwd lng="en"><![CDATA[NDF]]></kwd>
<kwd lng="en"><![CDATA[N fertilization]]></kwd>
<kwd lng="es"><![CDATA[Pastos tropicales]]></kwd>
<kwd lng="es"><![CDATA[Cinética de degradación]]></kwd>
<kwd lng="es"><![CDATA[Fracciones de proteína]]></kwd>
<kwd lng="es"><![CDATA[FDN]]></kwd>
<kwd lng="es"><![CDATA[Fertilización nitrogenada]]></kwd>
</kwd-group>
</article-meta>
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