<?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>S2079-34802021000400361</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Meta-analysis to determine the effect of energy additives on the pH of tropical forage silages]]></article-title>
<article-title xml:lang="es"><![CDATA[Metaanálisis para determinar el efecto de aditivos energéticos en el pH de ensilajes de forrajes tropicales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres Martínez]]></surname>
<given-names><![CDATA[Mildrey]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera Villafranca]]></surname>
<given-names><![CDATA[Magaly]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Hernández]]></surname>
<given-names><![CDATA[R.]]></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[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>55</volume>
<numero>4</numero>
<fpage>361</fpage>
<lpage>371</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2079-34802021000400361&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2079-34802021000400361&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2079-34802021000400361&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract A meta-analysis was developed to estimate the effect of energy additives on the pH of tropical forage silages. A total of 197 studies were reviewed, located in the databases EBSCO, Scielo, ScienceDirect, ResearchGate and the Cuban Journal of Agricultural Science. The selection of the articles took into account the fulfillment of the inclusion criteria, the reliability of the search and the evaluation of the methodological quality of each study. The difference in standardized means between the treated sample with the additive and the control was defined as the effect size index with its respective 95% confidence interval. The Cochrane Q test was used as a heterogeneity test, and the inconsistency statistic was used to quantify the variability percentage of the results between studies. The subgroup analysis technique was applied for the analysis of qualitative moderating variables and meta-regression for quantitative variables. Using a random effects model, the results showed the global effectiveness of the energy additives evaluated d (pH) = 3.077 (C.I 95 % (2.365-3.789)). Despite the high variability found in the literature that was consulted (I2&gt; 75 %), the meta-analysis techniques confirmed in a non-experimental way the favorable effect of using energy additives to benefit the fermentation process of the silage and its conservation. In this study, the description of each step of the methodology can be use as a guide to extrapolate and apply the meta-analysis to other spheres from the agricultural sector.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se desarrolló un metaanálisis para estimar el efecto de aditivos energéticos en el pH de ensilajes de forrajes tropicales. Se revisaron 197 estudios, localizados en las bases de datos EBSCO, Scielo, ScienceDirect, ResearchGate y la revista Cuban Journal of Agricultural Science. La selección de los artículos tuvo en cuenta el cumplimiento de los criterios de inclusión, la fiabilidad de la búsqueda y la evaluación de la calidad metodológica de cada estudio. Se definió la diferencia de medias estandarizadas entre la muestra tratada con el aditivo y el control, como el índice del tamaño del efecto con su respectivo intervalo de confianza al 95 %. Se utilizó la prueba Q de Cochrane como test de heterogeneidad, y el estadístico de inconsistencia para cuantificar el porcentaje de variabilidad de los resultados entre estudios. Se aplicó la técnica de análisis de subgrupo para el análisis de las variables moderadoras cualitativas y la metaregresión para las cuantitativas. Mediante un modelo de efectos aleatorios, los resultados mostraron la efectividad global de los aditivos energéticos evaluados d (pH)=3.077 (I.C 95 % (2.365-3.789)). A pesar de la alta variabilidad encontrada en la literatura que se consultó (I2 &gt;75 %), las técnicas de metaanálisis confirmaron de forma no experimental el efecto favorable de emplear aditivos energéticos para beneficiar el proceso fermentativo del ensilaje y su conservación. En este trabajo, la descripción de cada paso de la metodología puede servir de guía para extrapolar y aplicar el metaanálisis hacia otras esferas del sector agropecuario.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[fermentative indicator]]></kwd>
<kwd lng="en"><![CDATA[forage conservation]]></kwd>
<kwd lng="en"><![CDATA[heterogeneity]]></kwd>
<kwd lng="en"><![CDATA[subgroup analysis]]></kwd>
<kwd lng="en"><![CDATA[meta-regression]]></kwd>
<kwd lng="es"><![CDATA[indicador fermentativo]]></kwd>
<kwd lng="es"><![CDATA[conservación de forraje]]></kwd>
<kwd lng="es"><![CDATA[heterogeneidad]]></kwd>
<kwd lng="es"><![CDATA[análisis de subgrupo]]></kwd>
<kwd lng="es"><![CDATA[metaregresión]]></kwd>
</kwd-group>
</article-meta>
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