<?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>2079-3480</journal-id>
<journal-title><![CDATA[Cuban Journal of Agricultural Science]]></journal-title>
<abbrev-journal-title><![CDATA[Cuban J. Agric. Sci.]]></abbrev-journal-title>
<issn>2079-3480</issn>
<publisher>
<publisher-name><![CDATA[Editorial del Instituto de Ciencia Animal]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2079-34802022000100003</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of three collections of Tithonia diversifolia on the ruminal microbial population of cattle]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto de tres colectas de Tithonia diversifolia en la población microbiana ruminal de vacunos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galindo]]></surname>
<given-names><![CDATA[Juana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[Niurca]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera]]></surname>
<given-names><![CDATA[Magaly]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreira]]></surname>
<given-names><![CDATA[Onidia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Capó]]></surname>
<given-names><![CDATA[Aned]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Ciencia Animal  ]]></institution>
<addr-line><![CDATA[Mayabeque ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<volume>56</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2079-34802022000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2079-34802022000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2079-34802022000100003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In order to determine the effect of three collections of Tithonia diversifolia (mv-12, mv-14 and mv-17), collected in the eastern region of Cuba, on the ruminal microbial population of cattle, an experiment under in vitro conditions was developed. The control treatments with Cynodon nlemfuensis (star grass) were compared: star grass + mv-12; star grass + mv-14 and star grass + mv-17. The three collections were included at a rate of 20 % of the dry matter. The crude protein content was 19-23 % of the dry matter. With the materials mv-14 and mv-17 higher populations of cellulolytic bacteria were obtained, at three and six hours after starting fermentation with respect to that obtained with star grass. The three collections doubled the population of proteolytic bacteria three hours after starting fermentation, while at six hours only mv-12 produced effects in this bacterial group. The methane values were 37.4, 32.6, 33.2 and 32.33 g/kg of digested organic matter for the control, and the treatments mv-12, mv-14 and mv-17, respectively. Although they did not differ between plant materials, mv-12, mv-14 and mv-17 produced less methane than the star grass treatment only (P = 0.0477). It is concluded that the treatments mv-12, mv-14 and mv-17 caused modifications in the ruminal ecosystem, by increasing the population of total cellulolytic organisms and proteolytic bacteria; in addition to reducing the protozoan population. The methane estimated from crude protein concentration also decreased.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Para determinar el efecto de tres colectas de Tithonia diversifolia (mv-12, mv-14 y mv-17), recogidas en la región oriental de Cuba, en la población microbiana ruminal de vacunos, se desarrolló un experimento en condiciones in vitro. Se compararon los tratamientos control con Cynodon nlemfuensis (pasto estrella): pasto estrella + mv-12; pasto estrella + mv-14 y pasto estrella + mv-17. Las tres colectas se incluyeron a razón del 20 % de la materia seca. El contenido en proteína bruta fue de 19-23 % de la materia seca. Con los materiales mv-14 y mv-17 se obtuvieron mayores poblaciones de bacterias celulolíticas, a las tres y seis horas después de iniciada la fermentación con respecto a lo obtenido con pasto estrella. Las tres colectas duplicaron la población de bacterias proteolíticas a las tres horas de comenzar la fermentación, mientras que a las seis horas solamente el mv-12 produjo efectos en este grupo bacteriano. Los valores de metano fueron 37.4, 32.6, 33.2 y 32.33 g/kg de materia orgánica digerida para el control, y los tratamientos mv-12, mv-14 y mv-17, respectivamente. Aunque no difirieron entre materiales vegetales, mv-12, mv-14 y mv-17 produjeron menos metano que el tratamiento con pasto estrella solamente (P = 0.0477). Se concluye que los tratamientos mv- 12, mv- 14 y mv-17 propiciaron modificaciones en el ecosistema ruminal, al incrementar la población de organismos celulolíticos totales y bacterias proteolíticas; además de reducir la población de protozoos. El metano estimado a partir de la concentración en proteína bruta también disminuyó.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[cellulolytic bacteria]]></kwd>
<kwd lng="en"><![CDATA[proteolytic]]></kwd>
<kwd lng="en"><![CDATA[methane]]></kwd>
<kwd lng="en"><![CDATA[SCFAs]]></kwd>
<kwd lng="en"><![CDATA[protozoa]]></kwd>
<kwd lng="es"><![CDATA[bacterias celulolíticas]]></kwd>
<kwd lng="es"><![CDATA[proteolíticas]]></kwd>
<kwd lng="es"><![CDATA[metano]]></kwd>
<kwd lng="es"><![CDATA[AGCC]]></kwd>
<kwd lng="es"><![CDATA[protozoos]]></kwd>
</kwd-group>
</article-meta>
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