<?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>S2007-90282022000300010</article-id>
<article-id pub-id-type="doi">10.19136/era.a9n3.3252</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Seasonal variation in biomass yield and quality of Tithonia diversifolia at different cutting heights]]></article-title>
<article-title xml:lang="en"><![CDATA[Variación estacional en el rendimiento y calidad de Tithonia diversifolia a diferentes alturas de corte]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Uu-Espens]]></surname>
<given-names><![CDATA[Carol]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Canul-Solís]]></surname>
<given-names><![CDATA[Jorge R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chay-Canul]]></surname>
<given-names><![CDATA[Alfonso J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piñeiro-Vázquez]]></surname>
<given-names><![CDATA[Ángel T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villanueva-López]]></surname>
<given-names><![CDATA[Gilberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aryal]]></surname>
<given-names><![CDATA[Deb R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pozo-Leyva]]></surname>
<given-names><![CDATA[Dixan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Casanova-Lugo]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Tecnológico Nacional de México  ]]></institution>
<addr-line><![CDATA[Othón P. Blanco Quintana Roo]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Tecnologico Nacional de México  ]]></institution>
<addr-line><![CDATA[Tizimín Yucatán]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Juárez Autónoma de Tabasco División Académica de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[Villahermosa Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Tecnológico Nacional de México  ]]></institution>
<addr-line><![CDATA[Conkal Yucatán]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,El Colegio de la Frontera Sur  ]]></institution>
<addr-line><![CDATA[Centro Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Autónoma de Chiapas Facultad de Ciencias Agronómicas ]]></institution>
<addr-line><![CDATA[Villaflores Chiapas]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>9</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282022000300010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282022000300010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282022000300010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de esta investigación fue evaluar y comparar el rendimiento y la calidad del forraje de Tithonia diversifolia bajo diferentes alturas de cosecha, durante las estaciones seca y lluviosa en el tropico de México. Los tratamientos consistieron en tres alturas de cosecha a 40, 60 y 80 cm del nivel del suelo cortadas cada 60 días, durante dos épocas del año. En cada período, la biomasa se cosechó y se separó en componentes comestibles y no comestibles. Se determinó el rendimiento de biomasa y la concentración de proteína cruda (CP), fibra detergente neutra (FDN), fibra detergente ácido (FDA), lignina, cenizas y materia orgánica (MO) del forraje. El corte a 80 cm de altura produjo la mayor biomasa de forraje por cosecha (2 008 kg MS ha&#8722;1) mientras que no hubo diferencias significativas en el rendimiento de forraje entre 40 y 60 cm de altura. Las diferencias en las alturas de corte también afectaron la calidad de los nutrientes del forraje comestible animal porque las concentraciones de CP, FDA y FDN variaron significativamente. Hubo una interacción significativa entre las alturas de corte y la temporada en la producción y calidad del forraje. En la estación seca, el contenido de NDF, FDA, lignina y ceniza fue mayor, mientras que el PC y MO fueron menores. Se recomienda el uso de T. diversifolia como una planta forrajera y cosechar a una altura de 80 cm para mantener la mejor producción y la calidad del forraje durante todo el año para la producción ganadera.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of this research was to evaluate and compare the yield performance and quality of Tithonia diversifolia forage under different harvesting heights, during the dry and rainy seasons in tropical Mexico. The treatments consisted of three harvest heights 40, 60 and 80 cm from the ground level, cut every 60 days, during two seasons of the year. In each period, the biomass was harvested and separated into edible and non-edible components. We determined the biomass yield, and the concentration of crude protein (CP), neutral detergent fibre (NDF), acid detergent fibre (ADF), lignin, ash and organic matter (OM) of the forage. Cutting at 80 cm height yielded the highest forage biomass per harvest (2 008 kg DM ha&#8722;1) while there were no significant differences in forage yield between 40 and 60 cm heights. The differences in cutting heights also affected the nutrient quality of the animal edible forage because the concentrations of CP, ADF and NDF varied significantly. There was a significant interaction between cutting heights and the season on forage production and quality. In the dry season, the content of NDF, FDA, lignin and ash were higher, while the PC and OM were lower. The use of T. diversifolia as a forage plant and cutting it to a height of 80 cm is recommended to maintain the best production and the quality of the forage throughout the year for livestock production.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Livestock systems]]></kwd>
<kwd lng="en"><![CDATA[Mexican sunflower]]></kwd>
<kwd lng="en"><![CDATA[native shrubs]]></kwd>
<kwd lng="en"><![CDATA[nutritional quality]]></kwd>
<kwd lng="en"><![CDATA[repeated harvesting]]></kwd>
<kwd lng="es"><![CDATA[Sistemas ganaderos]]></kwd>
<kwd lng="es"><![CDATA[girasol mexicano]]></kwd>
<kwd lng="es"><![CDATA[arbustos nativos]]></kwd>
<kwd lng="es"><![CDATA[calidad nutricional]]></kwd>
<kwd lng="es"><![CDATA[cosechas repetidas]]></kwd>
</kwd-group>
</article-meta>
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