<?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>0120-0690</journal-id>
<journal-title><![CDATA[Revista Colombiana de Ciencias Pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Colom Cienc Pecua]]></abbrev-journal-title>
<issn>0120-0690</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-06902023000200066</article-id>
<article-id pub-id-type="doi">10.17533/udea.rccp.v36n2a2</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Performance and bone quality of broilers fed diets containing different levels of phosphorus and supplemented with phytase]]></article-title>
<article-title xml:lang="es"><![CDATA[Rendimiento y calidad ósea de pollos de engorde alimentados con dietas que contienen diferentes niveles de fósforo y suplementadas con fitasa]]></article-title>
<article-title xml:lang="pt"><![CDATA[Desempenho e qualidade óssea de frangos de corte alimentados com dietas com diferentes níveis de fósforo e suplementadas com fitase]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saldanha]]></surname>
<given-names><![CDATA[Mariana M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pereira]]></surname>
<given-names><![CDATA[Luiz F P]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abreu]]></surname>
<given-names><![CDATA[Anna R C]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[Fernanda L S]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Clímaco]]></surname>
<given-names><![CDATA[Winnie L S]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Araújo]]></surname>
<given-names><![CDATA[Itallo C S]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lara]]></surname>
<given-names><![CDATA[Leonardo J C]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal Rural da Amazônia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal de Minas Gerais  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,aff3  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Federal de Minas Gerais  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidade Federal de Minas Gerais  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidade Federal de Minas Gerais  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Universidade Federal de Minas Gerais  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<volume>36</volume>
<numero>2</numero>
<fpage>66</fpage>
<lpage>79</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-06902023000200066&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-06902023000200066&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-06902023000200066&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background:  Although phytase has been widely used in poultry nutrition, the effects of the enzyme on broilers fed low levels of phosphorus are poorly understood.  Objective:  To evaluate the effects of two commercial phytases on live performance and bone quality of broilers fed diets with normal and reduced levels of phosphorus.  Methods: Two experiments were conducted with four treatments and six repetitions with 30 birds each, for a total of 24 groups. The first experiment (Exp. I) used a reference level of available phosphorus (AP) with four treatments, as follows: Positive control= 0.45% AP starter diet/0.40% AP grower diet without phytase; Phytase X= 0.35% AP starter diet/0.30% AP grower diet + Phytase X; Phytase Y= 0.35% AP starter diet/0.30% AP grower diet + Phytase Y; and Negative control= 0.35% AP starter diet/0.30% AP grower diet, without phytase. In experiment II (Exp. II) the same treatments were used, but AP levels were reduced by 0.10%. The variables analyzed were: performance from one to 35 days, and bone quality at 35 days of age. Both experiments were analyzed using a completely randomized design.  Results:  In Exp. I, the positive control resulted in greater body weight gain (2,558 g; p&lt;0,05) compared to Phytase Y (2,470 g) and negative control (2,472 g), and better feed conversion ratio (1.48; p&lt;0,05) than the negative control (1.51). However, when phosphorus was reduced in Exp. II, the positive control and treatments with Phytase X showed better results (p&lt;0.01) for feed intake (3,608 g and 3,593 g, respectively) and weight gain (2,430 g and 2,400 g, respectively) compared to the negative control (2,889 g of feed intake and 1,915 g of weight gain; p&lt;0.01), which also presented low bone ash (36.8%) and phosphorus in the tibia (5.48%; p&lt;0.01).  Conclusion: Reducing AP concentration in diets not added with phytase negatively affects weight gain and feed intake of broilers.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Aunque la fitasa ha sido ampliamente utilizada en nutrición aviar, sus efectos en pollos de engorde alimentados con bajos niveles de fósforo son poco comprendidos.  Objetivo:  Evaluar el efecto de dos fitasas comerciales sobre el desempeño y la calidad ósea de pollos de engorde alimentados con dietas con niveles normales y reducidos de fósforo.  Métodos:  Se realizaron dos experimentos con cuatro tratamientos y seis repeticiones de 30 aves cada una, totalizando 24 grupos. En el primero (Exp. I) se utilizó el nivel de referencia de fósforo disponible (Pd) con cuatro tratamientos, así: Control positivo= 0,45% Pd dieta inicial/0,40% Pd dieta de engorde, sin fitasa; Fitasa X= 0,35% Pd dieta inicial/0,30% Pd dieta engorde + Fitasa X; Fitasa Y= 0,35% Pd dieta inicial/0,30% Pd dieta engorde + Fitasa Y; finalmente, Control negativo= 0,35% Pd dieta inicial/0,30% Pd dieta engorde, sin fitasa. En el segundo experimento (Exp. II) se utilizaron los mismos tratamientos, pero reduciendo en 0,10% el nivel de Pd. Las variables analizadas fueron: desempeño de uno a siete días y de uno a 35 días y calidad ósea a los 35 días de edad. Ambos experimentos se analizaron mediante un diseño completamente aleatorizado.  Resultados:  En el Exp. I, control positivo presentó una mayor ganancia de peso corporal (2.558 g; p&lt;0,05) en comparación con la Fitasa Y (2.470 g) y el control negativo (2.472 g), y mejor índice de conversión alimenticia (1,48; p&lt;0,05) que el control negativo (1,51). Sin embargo, cuando se redujo el nivel de fósforo en el Exp. II, el control positivo y los tratamientos con Fitasa X mostraron mejores resultados (p&lt;0,01) para el consumo de alimento (3.608 g y 3.593 g, respectivamente) y la ganancia de peso (2.430 g y 2.400 g, respectivamente) en comparación con el control negativo (2.889 g de consumo de alimento y 1.915 g de ganancia de peso; p&lt;0,01), el cual también presentó baja concentración de cenizas óseas (36,8%) y fósforo en tibia (5,48%; p&lt;0,01).  Conclusión:  La reducción de la concentración de Pd en dietas no aditivadas con fitasa afecta negativamente la ganancia de peso y el consumo de alimento del pollo de engorde.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Antecedentes:  A fitase é uma enzima amplamente utilizada na nutrição de frangos de corte. No entanto existem várias opções comerciais e seus efeitos com níveis reduzidos de fósforo, são pouco avaliados.  Objetivo:  Avaliar o efeito da suplementação de fitases comerciais no desempenho e na qualidade óssea de frangos de corte, alimentados com níveis normais e reduzidos de fósforo.  Métodos:  Dois experimentos foram conduzidos com quatro tratamentos e seis repetições, com 30 aves em cada, totalizando 24 grupos. No primeiro (I) utilizou o nível de referência de fósforo disponível (Pd), totalizando quatro tratamentos: controle positivo= 0,45% Pd dieta inicial/0,40% Pd dieta crescimento, sem fitase; tratamento fitase X= 0,35% Pd dieta inicial/0,30% Pd dieta crescimento + Fitase X; tratamento fitase Y= 0,35% Pd dieta inicial/0,30% Pd dieta de crescimento + Fitase Y; e controle negativo 0,35% Pd dieta inicial/0,30% Pd dieta crescimento, sem fitase. O segundo experimento utilizou os mesmos tratamentos, reduzindo 0,10% o nível de Pd. As variáveis &#8203;&#8203;analisadas foram: desempenho de um a sete dias e de sete a 35 dias e qualidade óssea aos 35 dias. Ambos os experimentos foram analisados usando um delineamento inteiramente casualizado.  Resultados:  No Experimento I, o tratamento controle positivo apresentou maior ganho de peso corporal (2.557,86 g; p&lt;0,05) em relação a fitase Y (2.470,27 g) e o controle negativo (2.471,73 g) e melhor índice de conversão alimentar (1,48; p&lt;0,05) do que o tratamento controle negativo (1,51). Porém, quando o nível de fósforo foi reduzido no Experimento II, o controle positivo e os tratamentos com fitase X apresentaram os melhores resultados (p&lt;0,01) para consumo de ração (3.608,0 g e 3.593,1 g, respectivamente) e ganho de peso corporal (2.429,8 g e 2.399,9 g, respectivamente) em comparação ao tratamento controle negativo (2.889,0 g de ingestão de ração e 1.915,3 g de ganho de peso corporal; p&lt;0,01) que também apresentou baixa concentração de cinzas ósseas (36,8%) e fósforo na tíbia (5,48%; p&lt;0,01). Conclusões. A redução da concentração de AP sem o uso de fitase reduz o ganho de peso corporal e o consumo de ração de frangos de corte.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[available phosphorus]]></kwd>
<kwd lng="en"><![CDATA[bone health]]></kwd>
<kwd lng="en"><![CDATA[broiler]]></kwd>
<kwd lng="en"><![CDATA[exogenous enzymes]]></kwd>
<kwd lng="en"><![CDATA[feed conversion]]></kwd>
<kwd lng="en"><![CDATA[weight gain]]></kwd>
<kwd lng="en"><![CDATA[growth performance]]></kwd>
<kwd lng="en"><![CDATA[low phosphorus diet]]></kwd>
<kwd lng="en"><![CDATA[mineral]]></kwd>
<kwd lng="en"><![CDATA[nutrition]]></kwd>
<kwd lng="en"><![CDATA[phytase]]></kwd>
<kwd lng="en"><![CDATA[poultry]]></kwd>
<kwd lng="es"><![CDATA[aves]]></kwd>
<kwd lng="es"><![CDATA[crecimiento]]></kwd>
<kwd lng="es"><![CDATA[desempeño]]></kwd>
<kwd lng="es"><![CDATA[dieta baja en fosforo]]></kwd>
<kwd lng="es"><![CDATA[conversión alimenticia]]></kwd>
<kwd lng="es"><![CDATA[enzimas exógenas]]></kwd>
<kwd lng="es"><![CDATA[fitasa]]></kwd>
<kwd lng="es"><![CDATA[fósforo disponible]]></kwd>
<kwd lng="es"><![CDATA[ganancia de peso]]></kwd>
<kwd lng="es"><![CDATA[mineral]]></kwd>
<kwd lng="es"><![CDATA[nutrición]]></kwd>
<kwd lng="es"><![CDATA[pollo de engorde]]></kwd>
<kwd lng="es"><![CDATA[salud ósea]]></kwd>
<kwd lng="pt"><![CDATA[conversão alimentar]]></kwd>
<kwd lng="pt"><![CDATA[desempenho]]></kwd>
<kwd lng="pt"><![CDATA[enzimas exógenas]]></kwd>
<kwd lng="pt"><![CDATA[dieta baixa em fósforo]]></kwd>
<kwd lng="pt"><![CDATA[fitase]]></kwd>
<kwd lng="pt"><![CDATA[fósforo disponível]]></kwd>
<kwd lng="pt"><![CDATA[frango de corte]]></kwd>
<kwd lng="pt"><![CDATA[ganho de peso]]></kwd>
<kwd lng="pt"><![CDATA[mineral]]></kwd>
<kwd lng="pt"><![CDATA[nutrição]]></kwd>
<kwd lng="pt"><![CDATA[saúde óssea]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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