<?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>S0120-06902020000400217</article-id>
<article-id pub-id-type="doi">10.17533/udea.rccp.v33n4a02</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effectiveness and optimum level of protected methionine in fattening pig diets]]></article-title>
<article-title xml:lang="es"><![CDATA[Efectividad y nivel óptimo de metionina protegida en dietas para cerdos en engorde]]></article-title>
<article-title xml:lang="pt"><![CDATA[Eficácia e nível ideal de metionina protegida em dietas para suínos de engorda]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Figueroa-Velasco]]></surname>
<given-names><![CDATA[José L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trujano-San-Luis]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Aispuro]]></surname>
<given-names><![CDATA[José A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Torres]]></surname>
<given-names><![CDATA[María T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Crosby-Galván]]></surname>
<given-names><![CDATA[María M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruíz-Flores]]></surname>
<given-names><![CDATA[Agustín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cordero-Mora]]></surname>
<given-names><![CDATA[José L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Zootecnia ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</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>33</volume>
<numero>4</numero>
<fpage>217</fpage>
<lpage>227</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-06902020000400217&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-06902020000400217&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-06902020000400217&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Methionine (Met) requirements have not been clearly established for fattening pigs due to their metabolic interrelationships and its bioavailability for protein synthesis.  Objective: To determine the optimum level of regular crystalline or protected Met in pig diets from nursery to finishing.  Methods: A total of 48 crossbred pigs (11.74±1.72 kg of initial body weight) were used. The treatments consisted of adding four levels (0.00, 0.05, 0.10, 0.15% in addition to dietary content) and two types of Met (regular and protected) to pig diets.  Results: Nursery, Finishing I, and II pigs fed protected Met increased daily feed intake (DFI; p&#8804;0.10). Protected Met raised daily weight gain (DWG) in nursery pigs and increased backfat thickness (BT) in nursery and grower pigs (p&#8804;0.10). In Finishing I pigs, protected Met increased DWG and improved carcass characteristics (p&#8804;0.10). In nursery and grower pigs, an extra 0.15% Met decreased feed:gain ratio (FGR; p&#8804;0.10). In grower and Finishing II pigs fed extra 0.05% Met improved DWG and extra 0.10% Met reduced plasma urea concentration (p&#8804;0.10).  Conclusions: Feeding protected Met in pig diets increases DWG, DFI and BT. Increasing 0.05-0.15% Met level improves FGR, DWG, potentially reducing nitrogen excretion to the environment.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: los requerimientos de metionina (Met) para cerdos en crecimiento no han sido claramente establecidos, lo que se debe a sus relaciones metabólicas y su biodisponibilidad para la síntesis proteica.  Objetivo: determinar el nivel óptimo de Met regular o protegida en dietas para cerdos en crecimiento.  Métodos: Se utilizaron un total de 48 cerdos híbridos (11,74±1,72 kg peso vivo inicial). Los tratamientos consistieron en niveles incrementales (0,00, 0,05, 0,10, 0,15% adicionales al contenido de la dieta) y dos tipos de Met (regular y protegida) en la dieta.  Resultados: los cerdos en iniciación, Finalización I, y II, alimentados con Met protegida tuvieron un mayor consumo diario de alimento (DFI; p&#8804;0,10). La Met protegida aumentó la ganancia diaria de peso (DWG) durante la etapa de iniciación, e incrementó el grosor de la grasa dorsal (BT) en iniciación y levante (p&#8804;0,10). Durante Finalización I, la Met protegida aumentó la DWG y mejoró las características de la canal (p&#8804;0,10). Durante iniciación y levante, 0,15% extra de Met disminuyó la conversión alimenticia (FGR; p&#8804;0,10). Los cerdos en levante y Finalización II alimentados con 0,05% extra de Met mejoraron la DWG y con 0.10% extra de Met redujeron la concentración de urea en plasma (p&#8804;0,10).  Conclusiones: el uso de Met protegida incrementa DWG, DFI y BT. El aumento del nivel de Met de 0,05-0,15% mejora FGR y DWG, y podria disminuir la excreción de nitrógeno al ambiente.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Antecedentes: os requisitos de metionina (Met) para suínos de engorda não foram claramente estabelecidos devido às suas relações metabólicas e sua biodisponibilidade para a síntese de proteínas.  Objetivo: determinar o nível ideal de Met regular ou protegida em dietas para suínos de engorda.  Métodos: foram utilizados 48 suínos híbridos (11,74±1,72 kg de peso vivo inicial). Os tratamentos consistiram em quatro níveis (0,00, 0,05, 0,10, 0,15% mais) e dois tipos (regular e protegida) de Met em dietas para suínos de engorda.  Resultados: suínos no início, finalização I e II alimentados com Met protegida aumentaram o consumo diário de ração (DFI; p&#8804;0,10). Met protegido aumentou o ganho de peso diário (DWG) em suínos na iniciação e, aumentou espessura da gordura dorsal (BT) em suínos em iniciação e crescimento (p&#8804;0,10). Nos suínos finalização I, Met protegido aumentou DWG e melhorou as características do canal (p&#8804;0,10). Para suínos de iniciação e crescimento, 0,15% extra de Met diminuiu conversão alimentar (FGR; p&#8804;0,10). No crescimento e finalização II, a adição de 0,05% de Met melhoraram o DWG e com 0,10% reduziram a concentração de uréia (p&#8804;0,10).  Conclusões: o uso de Met protegida melhora DWG, DFI e BT. O nível de Met aumentado de 0,05-0,15% melhora FGR e DWG; além disso, a excreção de nitrogênio ambiental pode ser diminuída.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[bioavailability]]></kwd>
<kwd lng="en"><![CDATA[carcass traits]]></kwd>
<kwd lng="en"><![CDATA[growth performance]]></kwd>
<kwd lng="en"><![CDATA[nutrient requirements]]></kwd>
<kwd lng="en"><![CDATA[pig]]></kwd>
<kwd lng="en"><![CDATA[protected methionine]]></kwd>
<kwd lng="en"><![CDATA[protein]]></kwd>
<kwd lng="en"><![CDATA[swine]]></kwd>
<kwd lng="en"><![CDATA[synthetic amino acids]]></kwd>
<kwd lng="en"><![CDATA[urea.]]></kwd>
<kwd lng="es"><![CDATA[aminoácidos sintéticos]]></kwd>
<kwd lng="es"><![CDATA[biodisponibilidad]]></kwd>
<kwd lng="es"><![CDATA[características de la canal]]></kwd>
<kwd lng="es"><![CDATA[cerdos]]></kwd>
<kwd lng="es"><![CDATA[comportamiento productivo]]></kwd>
<kwd lng="es"><![CDATA[metionina protegida]]></kwd>
<kwd lng="es"><![CDATA[proteína]]></kwd>
<kwd lng="es"><![CDATA[requerimientos nutricionales]]></kwd>
<kwd lng="es"><![CDATA[suínos]]></kwd>
<kwd lng="es"><![CDATA[urea]]></kwd>
<kwd lng="pt"><![CDATA[aminoácidos sintéticos]]></kwd>
<kwd lng="pt"><![CDATA[biodisponibilidade]]></kwd>
<kwd lng="pt"><![CDATA[características de carcaça]]></kwd>
<kwd lng="pt"><![CDATA[comportamento produtivo]]></kwd>
<kwd lng="pt"><![CDATA[metionina protegida]]></kwd>
<kwd lng="pt"><![CDATA[necessidades nutricionais]]></kwd>
<kwd lng="pt"><![CDATA[porcos]]></kwd>
<kwd lng="pt"><![CDATA[proteína]]></kwd>
<kwd lng="pt"><![CDATA[suínos]]></kwd>
<kwd lng="pt"><![CDATA[uréia]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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