<?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>S2079-34802020000300387</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Substitution of commercial feed for natural zeolite in Nile tilapias GIFT (Oreochromis niloticus)]]></article-title>
<article-title xml:lang="es"><![CDATA[Sustitución de pienso comercial por zeolita natural en tilapias del Nilo GIFT (Oreochromis niloticus)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Llanes]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Empresa Desarrollo Tecnologías Acuícolas  ]]></institution>
<addr-line><![CDATA[Cotorro La Habana]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<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>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>54</volume>
<numero>3</numero>
<fpage>387</fpage>
<lpage>394</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2079-34802020000300387&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2079-34802020000300387&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2079-34802020000300387&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Using a one-way design, with four treatments and three repetitions, different percentages (1, 3 and 5) of substitution of commercial feed by natural zeolite in Nile tilapia GIFT (Oreochromis niloticus) were evaluated. A total of 240 small fish (0.11 ± 0.03 g initial weigh) were used, which were fed with experimental rations during 60d.The increase of zeolite in the rations decrease (P &lt; 0.05) the amount of food per animal (9.08 to 6.50 g) and intake protein (2.95 a 2.09 g). There were not differences (P &gt;0.05) in the final weights (5.88, 5.84, 4.89 and 5.74 g) and survivals (86.66, 95.67, 90.00 and 90.00 %) between the experimental treatments. However, the feed conversion and protein efficiency increase (P &lt; 0.05) with 5 % of zeolite, which allowed decrease the feeding costs with saving of US $ 226.74 /t. It is concluded that the substitution of 5 % of commercial feed by natural zeolite improves the efficiency in the food use as positive economic effect. It is proposed to continue researchers with zeolite as partial replacement of protein raw matters in tilapias feed.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Mediante un diseño de clasificación simple, con cuatro tratamientos y tres repeticiones, se evaluaron diferentes porcentajes (1, 3 y 5) de sustitución de pienso comercial por zeolita natural en tilapias del Nilo GIFT (Oreochromis niloticus). Se utilizaron 240 alevines (0.11 ± 0.03 g de peso inicial), que se alimentaron con las raciones experimentales durante 60 d. El incremento de la utilización de zeolita en las raciones disminuyó (P &lt; 0.05) la cantidad de alimento por animal (9.08 a 6.50 g) y de proteína suministrada (2.95 a 2.09 g). No se encontraron diferencias (P &gt;0.05) en los pesos finales (5.88, 5.84, 4.89 y 5.74 g) y las supervivencias (86.66, 95.67, 90.00 y 90.00%) entre los tratamientos experimentales. Sin embargo, la conversión alimentaria y la eficiencia proteica mejoraron (P &lt; 0.05) con 5 % de zeolita, lo que permitió disminuir los costos de alimentación con ahorro de US $ 226.74 /t. Se concluye que la sustitución de 5 % de pienso comercial por zeolita natural cubana mejora la eficiencia en la utilización del alimento con efecto económico positivo. Se propone continuar investigaciones con la zeolita como sustituto parcial de materias primas proteicas en el pienso de tilapias.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[feeding]]></kwd>
<kwd lng="en"><![CDATA[minerals]]></kwd>
<kwd lng="en"><![CDATA[fishes]]></kwd>
<kwd lng="en"><![CDATA[zoad]]></kwd>
<kwd lng="es"><![CDATA[alimentación]]></kwd>
<kwd lng="es"><![CDATA[minerales]]></kwd>
<kwd lng="es"><![CDATA[peces]]></kwd>
<kwd lng="es"><![CDATA[zoad]]></kwd>
</kwd-group>
</article-meta>
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