<?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>S2007-11242025000600006</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v16s4.6698</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Composición bioquímica de pastos tropicales por época del año recibiendo fertilización nitrogenada con riego]]></article-title>
<article-title xml:lang="en"><![CDATA[Biochemical composition of tropical grasses receiving nitrogen fertilization with irrigation by season of the year]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras-Jácome]]></surname>
<given-names><![CDATA[Jorge Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<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[Montero-Lagunes]]></surname>
<given-names><![CDATA[Maribel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Enríquez-Quiroz]]></surname>
<given-names><![CDATA[Javier Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro-González]]></surname>
<given-names><![CDATA[Abigail]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Hernández]]></surname>
<given-names><![CDATA[José 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[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[ Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>16</volume>
<fpage>47</fpage>
<lpage>61</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242025000600006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242025000600006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242025000600006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo fue evaluar el efecto de la fertilización con nitrógeno y riego (FR) por época del año sobre rendimiento de materia seca (RMS) y composición bioquímica de pastos tropicales. Se utilizaron cinco variedades de pastos. Cada uno con tres repeticiones con FR, y tres repeticiones sin FR. Los pastos se cortaron cada 35 días. La dosis de fertilización con Nitrógeno fue de 138 kg/ha/año equivalente a 300 kg de urea. Las parcelas con FR se regaron de diciembre a mayo. Las épocas fueron: lluvias (L, jun-nov); &#8220;nortes&#8221; (N, dic-feb) y sequía (S, mar-may). Se determinó RMS, y se estimaron las fracciones de carbohidratos y de proteínas disponibles. El diseño estadístico fue completamente al azar en arreglo de parcelas subdivididas. Las medias se compararon por Tukey (P&#8804;0.05). Sin FR en L el RMS fue el 53 % de lo que se produce con FR, y en N y S solo es el 26 y 15 % respectivamente. El nitrógeno no proteico y la proteína verdadera soluble en rumen son las fracciones proteicas que más se incrementan con FR. Los carbohidratos totales (CT), carbohidratos no fibrosos (CNF) y fibra detergente neutro (FDN) digestible son más elevados en L y S; siendo en los pastos sin FR mayores los incrementos en CT en S, CNF en L y S y FDN digestible en S. Las fracciones indigestibles se incrementan en &#8220;nortes&#8221;, y en los pastos con FR también en la época de sequía. El efecto del FR sobre las fracciones de carbohidratos es clima-dependiente.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective was to evaluate the effect of nitrogen fertilization and irrigation (FI) by season of the year on the dry matter yield (DMY) and biochemical composition of tropical grasses. Five grass varieties were used. Each with three replications with FI and three replications without FI. The pastures were cut every 35 d. The dose of nitrogen fertilization was 138 kg/ha/yr, equivalent to 300 kg of urea. The plots with FI were irrigated from December to May. The seasons were: rainy (R, Jun-Nov), &#8220;north winds&#8221; (N, Dec-Feb), and dry (D, Mar-May). DMY was determined, and the available carbohydrate and protein fractions were estimated. The statistical design was completely randomized in a split-split-plot arrangement. Means were compared by Tukey (P&#8804;0.05). Without FI, in R, DMY is 53 % of the amount produced with FI, and in N and D, it is only 26 and 15 %, respectively. Non-protein nitrogen and rumen-soluble true protein are the protein fractions that are most increased with FI. Total carbohydrates (TC), non-fibrous carbohydrates (NFC), and digestible neutral detergent fiber (NDF) are higher in R and D, and the pastures without FI showed the highest increases in TC in D, NFC in R and D, and digestible NDF in D. Indigestible fractions increase during the &#8220;north wind&#8221; season, and regarding pastures with FI, they also increase during the dry season. The effect of FI on carbohydrate fractions is climate-dependent.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Forrajes]]></kwd>
<kwd lng="es"><![CDATA[Calidad nutricional]]></kwd>
<kwd lng="es"><![CDATA[Fertirriego]]></kwd>
<kwd lng="en"><![CDATA[Forages]]></kwd>
<kwd lng="en"><![CDATA[Nutritional quality]]></kwd>
<kwd lng="en"><![CDATA[Fertigation]]></kwd>
</kwd-group>
</article-meta>
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