<?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>S2079-34802020000400557</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Phytobiotic effect of Psidium guajava leaf powder on productivity and quality of the egg of laying hens]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto fitobiótico del polvo de hojas de Psidium guajava en la productividad y calidad del huevo de gallinas ponedoras]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
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<contrib contrib-type="author">
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<surname><![CDATA[Pupo]]></surname>
<given-names><![CDATA[G.E.]]></given-names>
</name>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosabal]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Olmo]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Valdivié]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Escuela Agrícola Panamericana Departamento de Ciencia y Producción Agropecuaria ]]></institution>
<addr-line><![CDATA[Zamorano ]]></addr-line>
<country>Honduras</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Granma Centro de Estudios de Producción Animal Facultad de Ciencias Agrícolas]]></institution>
<addr-line><![CDATA[Bayamo Granma]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro Nacional para la Producción de Animales de Laboratorio  ]]></institution>
<addr-line><![CDATA[La Habana ]]></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>4</numero>
<fpage>557</fpage>
<lpage>568</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2079-34802020000400557&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2079-34802020000400557&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2079-34802020000400557&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In order to evaluate the phytobiotic effect of Psidium guajava (guava) leaf powder on the productivity and quality of the egg of laying hens, a phytochemical screening of the leaves under study was previously developed. A total of 160 White Leghorn L-33 hens, of 27 weeks old, were randomly distributed for 70 days in four treatments, with 10 repetitions each, and four hens per repetition. The treatments consisted on a control diet (T0) and the addition of 0.5 (T1), 1.0 (T2) and 1.5 % (T3) of Psidium guajava leaf powder. Saponins, reducing sugars, quinones, triterpenes, free amino acids, anthocyanidins, tannins and flavonoids (++) were detected in P. guajava leaves. The addition with 0.5 % of P. guajava leaf powder improved (P &lt;0.05) the mass conversion (2.41 kg/kg), the production (83.46 %) and the egg weight (54.75 g) compared to the control, without notable changes (P&gt; 0.05) for the food intake and the unfit eggs. In addition, this treatment (0.5 %) increased the shell thickness (0.26 mm) and the yolk color (7). However, the addition of 1.5 of P. guajava decreased (P &lt;0.05) the height of the white (5.97 mm) with respect to T0. The shell surface and yolk height did not change as a result of the experimental treatments (P&gt; 0.05). The addition of 0.5 % of P. guajava leaf powder to laying hen diets is recommended to improve productivity and some indicators of egg quality.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Para evaluar el efecto fitobiótico del polvo de hojas de Psidium guajava (guayaba) en la productividad y calidad del huevo de gallinas ponedoras, se desarrolló previamente un tamizaje fitoquímico a las hojas en estudio. Un total de 160 gallinas White Leghorn L-33, de 27 semanas de edad, se distribuyeron aleatoriamente durante 70 días en cuatro tratamientos, con 10 repeticiones cada uno, y cuatro gallinas por repetición. Los tratamientos consistieron en una dieta control (T0) y la adición de 0.5 (T1), 1.0 (T2) y 1.5 % (T3) del polvo de hojas de Psidium guajava. En las hojas de P. guajava se detectaron saponinas, azúcares reductores, quinonas, triterpenos, aminoácidos libres, antocianidinas, taninos y flavonoides (++). La adición con 0.5% de polvo de hojas de P. guajava mejoró (P&lt;0.05) la conversión masal (2.41 kg/kg), la producción (83.46%) y el peso del huevo (54.75 g) en comparación con el control, sin cambios notables (P&gt;0.05) para el consumo de alimento y los huevos no aptos. Además, este tratamiento (0.5 %) incrementó el grosor de la cáscara (0.26 mm) y el color de la yema (7). No obstante, la adición de 1.5% de P. guajava disminuyó (P &lt; 0.05) la altura de la clara (5.97 mm) con respecto a T0. La superficie de la cáscara y altura de la yema no cambiaron por efecto de los tratamientos experimentales (P &gt; 0.05). Se recomienda la adición de 0.5% del polvo de hojas de P. guajava en las dietas de gallinas ponedoras para mejorar la productividad y algunos indicadores de la calidad de huevo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[additive]]></kwd>
<kwd lng="en"><![CDATA[laying hen (ave de postura)]]></kwd>
<kwd lng="en"><![CDATA[guava]]></kwd>
<kwd lng="en"><![CDATA[biological response]]></kwd>
<kwd lng="es"><![CDATA[aditivo]]></kwd>
<kwd lng="es"><![CDATA[ave de postura]]></kwd>
<kwd lng="es"><![CDATA[guayaba]]></kwd>
<kwd lng="es"><![CDATA[respuesta biológica]]></kwd>
</kwd-group>
</article-meta>
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