<?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>S0120-06902021000200095</article-id>
<article-id pub-id-type="doi">10.17533/udea.rccp.v34n2a02</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of dietary inclusion of guanidinoacetic acid on broiler performance]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto de la inclusión dietética del ácido guanidinoacético en el desempeño de pollos de engorde]]></article-title>
<article-title xml:lang="pt"><![CDATA[Efeito da inclusão dietética do ácido guanidinoacético no desempenho de frangos de corte]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Borges]]></surname>
<given-names><![CDATA[Kamilla M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mello]]></surname>
<given-names><![CDATA[Heloisa H de C]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Café]]></surname>
<given-names><![CDATA[Marcos B]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arnhold]]></surname>
<given-names><![CDATA[Emmanuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Xavier]]></surname>
<given-names><![CDATA[Hyara P F]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Oliveira]]></surname>
<given-names><![CDATA[Helder F]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mascarenhas]]></surname>
<given-names><![CDATA[Alessandra G]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal de Goiás Escola de Veterinária e Zootecnia ]]></institution>
<addr-line><![CDATA[Goiânia Goiás]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>34</volume>
<numero>2</numero>
<fpage>95</fpage>
<lpage>104</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-06902021000200095&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-06902021000200095&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-06902021000200095&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Creatine and its precursor, guanidinoacetic acid (GAA), decrease protein degradation, avoiding amino acid offset to gluconeogenesis.  Objective: To evaluate the inclusion of GAA in the pre-initial diet (1 to 7 days) on performance, digestibility, and blood parameters of broilers from one to 21 days of age.  Methods: 252 male broiler chickens aged one day were distributed in a completely randomized design with seven replicates and 12 animals per experimental unit. Treatments consisted of a basal diet, and the basal added with 0.10 and 0.20% GAA.  Results: From days 1 to 7, a tendency on improved feed conversion (FC) was observed for broilers receiving 0.20% GAA (p&lt;0.10). Between 7 and 14 days, FC improved, as well as a tendency was observed on improved weight gain in animals fed 0.20% GAA. Animals that received 0.20% GAA showed higher blood concentrations of creatine kinase. Blood creatine and blood glucose did not differ between treatments at day six. The assimilation coefficient of crude protein increased during days 3 to 7 for animals receiving 0.20% GAA. On the period between 17 and 21 days, no difference was observed between treatments. Intestinal weight and length did not show significant differences.  Conclusion: Dietary inclusion of 0.20% GAA during the pre-initial stage could improve weight gain and feed conversion of broilers between 1 and 14 days of age.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: La creatina suministra energía y el ácido guanidinoacético (GAA) es su precursor y actúa como sustrato energético, reduciendo la degradación proteica y evitando el desvío de aminoácidos para gluconeogénesis.  Objetivo: Evaluar el GAA en la dieta de pre-iniciación (1 a 7 dias) sobre el desempeño, la digestibilidad y los parámetros sanguíneos de pollos entre 1 y 21 dias de edad.  Métodos: Se utilizaron 252 pollitos de engorde machos de un día de edad, distribuidos en un diseño completamente al azar, con siete repeticiones y 12 aves por unidad experimental. Los tratamientos consistieron en: ración basal y ración basal adicionada con 0,10 y 0,20% de GAA.  Resultados: En el período de 1 a 7 días se observó una tendencia de mejora de la conversión alimenticia (FC) en las aves que recibieron 0,20% de GAA (p&lt;0,10). De 7 a 14 días hubo mejoría en FC y tendencia de mejora en ganancia de peso de los animales que recibieron 0,20% de GAA. Los animales que recibieron 0,20% de GAA presentaron mayor concentración sanguínea de creatina quinasa. La creatinina y la glucosa sanguínea a los seis días no difirieron entre los tratamientos. El coeficiente de metabolización de la proteína bruta aumentó en el período de 3 a 7 días en los animales que recibieron 0,20% de GAA. Para el período de 17 a 21 días no hubo diferencia entre los tratamientos. Para peso y longitud del intestino no se presentaron diferencias significativas.  Conclusión: El GAA a un nivel de 0,20% en la dieta pre- inicial podria mejorar la ganancia de peso, y la conversión alimenticia en el período de 1 a 14 días de edad en pollos de engorde.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Antecedentes: A creatina é uma substância que fornece energia e o ácido guanidinoacético (GAA) é seu precursor atuando como substrato energético, menor degradação proteica evitando o desvio de aminoácidos para gliconeogênese.  Objetivo: Avaliar o GAA em dietas pré-iniciais sobre o desempenho, a digestibilidade e parâmetros sanguíneos.  Métodos: Foram utilizados 252 pintos de corte machos de um a 21 dias de idade distribuído sem delineamento inteiramente casualizado, sete repetições e 12 aves por unidade experimental. Os tratamentos consistiram: ração basal e rações com 0,10 e 0,20% de GAA.  Resultados: No período de 1 a 7 dias foi observada tendência de melhora da conversão alimentar (FC) (p&lt;0,10) quando as aves receberam 0,20% de GAA. No período de 7 a 14 dias houve melhora na FC e tendência de melhora do ganho de peso dos animais que receberam 0,20% de GAA. Animais que receberam 0,20% de GAA apresentaram concentração sanguínea da enzima creatina quinase maior. A creatinina sanguínea aos seis dias e glicose sanguínea não diferiram entre os tratamentos. O coeficiente de metabolização da proteína bruta foi aumentado no período de 3 a 7 dias para animais que receberam 0,20% de GAA, para o período de 17 a 21 dias não houve diferença entre os tratamentos. Peso e comprimento do intestino não apresentaram diferenças significativas.  Conclusão: O GAA em nível de 0,20% na dieta pré-inicial melhoram o ganho de peso, e a conversão alimentar no período de 1 a 14 dias de idade em frangos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[additive]]></kwd>
<kwd lng="en"><![CDATA[broilers]]></kwd>
<kwd lng="en"><![CDATA[chicken]]></kwd>
<kwd lng="en"><![CDATA[creatine]]></kwd>
<kwd lng="en"><![CDATA[feed additive]]></kwd>
<kwd lng="en"><![CDATA[guanidinoacetic acid]]></kwd>
<kwd lng="en"><![CDATA[metabolism]]></kwd>
<kwd lng="en"><![CDATA[nutrition]]></kwd>
<kwd lng="en"><![CDATA[organ biometry]]></kwd>
<kwd lng="en"><![CDATA[poultry]]></kwd>
<kwd lng="es"><![CDATA[ácido guanidinoacético]]></kwd>
<kwd lng="es"><![CDATA[aditivo]]></kwd>
<kwd lng="es"><![CDATA[aditivo alimentario]]></kwd>
<kwd lng="es"><![CDATA[aves de corral]]></kwd>
<kwd lng="es"><![CDATA[biometría de órganos]]></kwd>
<kwd lng="es"><![CDATA[creatina]]></kwd>
<kwd lng="es"><![CDATA[metabolismo]]></kwd>
<kwd lng="es"><![CDATA[nutrición]]></kwd>
<kwd lng="es"><![CDATA[pollos de engorde]]></kwd>
<kwd lng="pt"><![CDATA[ácido guanidinoacético]]></kwd>
<kwd lng="pt"><![CDATA[aditivo]]></kwd>
<kwd lng="pt"><![CDATA[aditivo alimentar]]></kwd>
<kwd lng="pt"><![CDATA[aves]]></kwd>
<kwd lng="pt"><![CDATA[biometria de órgãos]]></kwd>
<kwd lng="pt"><![CDATA[creatina]]></kwd>
<kwd lng="pt"><![CDATA[frango]]></kwd>
<kwd lng="pt"><![CDATA[metabolismo]]></kwd>
<kwd lng="pt"><![CDATA[nutrição]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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