<?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>2071-0054</journal-id>
<journal-title><![CDATA[Revista Ciencias Técnicas Agropecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cie Téc Agr]]></abbrev-journal-title>
<issn>2071-0054</issn>
<publisher>
<publisher-name><![CDATA[Universidad Agraria de La Habana]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2071-00542019000100006</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Evaluation of Centrifugal Pumps in a Silage Feed Processing Plant for Pigs]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación de las bombas centrifugas en una planta procesadora de alimento ensilado para cerdos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Peña]]></surname>
<given-names><![CDATA[Arelys]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Cardenas]]></surname>
<given-names><![CDATA[Verena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cobo-Cuña]]></surname>
<given-names><![CDATA[Fermín Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez]]></surname>
<given-names><![CDATA[Antihus Hernández]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-González]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerra-Bustillo]]></surname>
<given-names><![CDATA[Caridad Walkiria]]></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>
<aff id="Af2">
<institution><![CDATA[,Universidad Agraria de La Habana  ]]></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>03</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2019</year>
</pub-date>
<volume>28</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2071-00542019000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2071-00542019000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2071-00542019000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The work was carried out with the objective of determining how often the centrifugal pumps for industrial silage production have to work in the "Héctor Molina" plant of the Municipality of San Nicolás de Bari in Mayabeque, Cuba. That technology was developed by the Institute of Animal Science (ICA) and it uses by-products and wastes from the sugar industry and agricultural production for animal feed. To determine the frequency, the sedimentation rate (v) of the solids in the liquid raw materials (thermolised Saccharomyces cerevisiae yeast cream, concentrated vinasse) and the silage feed was calculated. For that, three experiments were carried out, each one with 10 graduated test tubes. Initial height of each test tube and height of descendant interfaces at different time intervals were measured and the behavior of the variable sedimentation vs. time was analyzed with statistical criteria. It was obtained that the (v) of the vinasse, cream and silage are 1,58 E-6 m / s, 2,76 E-07 m / s, and 1,55 E-07m / s, respectively. It is concluded that the centrifugal pump must recirculate the vinasse and the cream to maintain a stable chemical composition every 4 h and 12 h. The silage should be recirculated every 58 h to facilitate the extraction of the final product from the silos and the model that best describes the sedimentation of CSF is the quadratic model.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El trabajo se realizó con el objetivo de determinar con qué frecuencia tienen que trabajar las bombas centrífugas para la producción de ensilado a escala industrial en la planta &#8220;Héctor Molina&#8221; del Municipio San Nicolás de Barís en Mayabeque, Cuba. Tecnología desarrollada por el Instituto de Ciencia Animal (ICA), que aprovecha subproductos y desechos de la industria azucarera y de las producciones agrícolas, para la alimentación animal. Para determinar la frecuencia se calculó la velocidad de sedimentación (v) de los sólidos en las materias primas líquidas (crema de levadura Saccharomyces cerevisiae termolizada, vinaza concentrada) y el alimento ensilado, para esto se realizaron tres experimentos cada uno con 10 probetas aforadas, se midieron la altura inicial de cada probeta, la altura de interfases descendientes a diferentes intervalos de tiempo y se analizó el comportamiento de la variable sedimentación vs tiempo con criterios estadísticos. Se obtuvo que la (v) de la vinaza, la crema y del ensilaje son de 1,58 E-6 m/s, 2,76 E-07 m/s, y 1,55 E-07 m/s respectivamente. Se concluye que la bomba centrifuga debe recircular la vinaza y la crema para mantener una composición química estable cada 4 h y 12 h. El ensilaje debe recircularse cada 58 h para facilitar la extracción del producto final de los silos y el modelo que mejor describe la sedimentación del AEC es el modelo cuadrático.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[sedimentation]]></kwd>
<kwd lng="en"><![CDATA[silage]]></kwd>
<kwd lng="en"><![CDATA[centrifugal pumps]]></kwd>
<kwd lng="en"><![CDATA[recirculation]]></kwd>
<kwd lng="es"><![CDATA[sedimentación]]></kwd>
<kwd lng="es"><![CDATA[ensilaje]]></kwd>
<kwd lng="es"><![CDATA[bombas centrífugas]]></kwd>
<kwd lng="es"><![CDATA[recirculación]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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