<?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>2007-1124</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. pecuarias]]></abbrev-journal-title>
<issn>2007-1124</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11242017000200121</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v8i2.4414</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Eficacia de dos fitasas bacterianas en la liberación de fósforo en dietas para pollos de engorda en crecimiento]]></article-title>
<article-title xml:lang="en"><![CDATA[Efficacy of two bacterial phytase in the release of phosphorus in diets for growing chicken broilers]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Diosdado Espinoza]]></surname>
<given-names><![CDATA[María Liliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortes Cuevas]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avila González]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Veterinaria y Zootecnia Centro de Enseñanza, Investigación y Extensión en Producción Avícola]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<volume>8</volume>
<numero>2</numero>
<fpage>121</fpage>
<lpage>128</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242017000200121&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242017000200121&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242017000200121&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La eficacia de dos fitasas (Citrobacter brakii y E. Coli) utilizadas en diferentes dosis (500 y 1,000 FTU) se evaluaron en una dieta deficiente en fósforo (0.15% P disponible) formulada a base de sorgo-soya. Para la estimación de la eficacia en la liberación de P de las fitasas evaluadas se utilizó como referencia fósforo inorgánico suplementado a través de fosfato monodicálcico (FMD), para alcanzar una concentración final de P disponible de 0.23, 0.31 y 0.39 %. Para lo anterior la dieta basal deficiente en P se suplementó como sigue: 1) sin fitasas, sin FMD; 2) 0.08% FMD; 3) 0.16% FMD; 4) 0.24% PMD; 5) citrobacter-500 FTU; 6) coli-500 FTU; 7) citrobacter-1,000 FTU y 8) coli-1,000 FTU. Los tratamientos se aplicaron a 216 pollos de la estirpe Ross (27 pollos/tratamiento) de los 7 a 21 días de edad. La ganancia de peso, eficiencia alimenticia y concentración de ceniza y P en tibias fue mayor en los pollos que recibieron 0.39% PMD y los 1,000 FTU de ambas fitasas, no existiendo diferencias en estos niveles entre los tratamientos FMD y fitasas. La cantidad de fósforo liberado no se afectó (P&gt;0.05) por el tipo de fitasa (promedio 0.142 %), pero sí por el nivel de fitasa utilizado (0.102 vs 0.182 % para 500 y 1,000 FTU respectivamente). Los resultados indican que la suplementación con 1,000 FTU/kg de ambas fitasas en dietas deficientes en P resulta en ganancias y eficiencias alimenticias similares cuando las dietas se suplementan hasta 0.24 % de FMD. Ambas fitasas mejoraron en 78.4 % el aprovechamiento del fósforo fítico en dietas sorgo-soya para pollos en crecimiento.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The efficacy of two phytases (Citrobacter brakii and Escherichia coli) used in different doses (500 and 1,000 FTU) were evaluated in a diet deficient in phosphorus (0.15% available P) formulated with sorghum-soybean meal. To estimate the efficacy of the release of P evaluated phytases, inorganic phosphorus supplemented by mono-phosphate (MDP) to reach a final concentration of available P of 0.23, 0.31 and 0.39 % was used as reference. The basal diet deficient in P was supplemented as follows: 1) Without phytases, without MDP; 2) 0.08% MDP; 3) 0.16% MDP; 4) 0.24% MDP; 5) Citrobacter-500 FTU; 6) coli FTU-500; 7) citrobacter-1,000 FTU and 8) FTU coli-1,000. The treatments were applied to Ross 216 chickens (27 birds/treatment) 7 to 21 d old. Weight gain, feed efficiency and concentration of tibia ash and P was better in chickens receiving 0.39% PMD and 1,000 FTU of both phytase, with no differences in these levels between MDP and phytase treatments. The amount of phosphorus released was not affected (P&gt;0.05) by type of phytase (average 0.142 %), with effect to level of phytase used (0.102 vs 0.182 % for 500 and 1,000 FTU respectively). The results indicate that supplementation 1,000 FTU / kg in both phytase in diets deficient in P results in weight gain and feed efficiency similar when the diets are supplemented with 0.24% MDP. Both phytases improved to 78.4 % utilization of phytate phosphorus in sorghum-soybean meal diets on growing chicks.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fitasas]]></kwd>
<kwd lng="es"><![CDATA[Citrobacter braakii]]></kwd>
<kwd lng="es"><![CDATA[Escherichia coli]]></kwd>
<kwd lng="es"><![CDATA[Fósforo en tibias]]></kwd>
<kwd lng="es"><![CDATA[Cenizas en tibias]]></kwd>
<kwd lng="es"><![CDATA[Pollos de engorda]]></kwd>
<kwd lng="en"><![CDATA[Phytases]]></kwd>
<kwd lng="en"><![CDATA[Citrobacter braakii]]></kwd>
<kwd lng="en"><![CDATA[Escherichia coli]]></kwd>
<kwd lng="en"><![CDATA[Phosphorus tibia]]></kwd>
<kwd lng="en"><![CDATA[Tibia ashes]]></kwd>
<kwd lng="en"><![CDATA[Broilers]]></kwd>
</kwd-group>
</article-meta>
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