<?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>S0120-06902020000400228</article-id>
<article-id pub-id-type="doi">10.17533/udea.rccp.v33n4a03</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Multi-objective optimization of methionine+cysteine levels in diets for growing pigs]]></article-title>
<article-title xml:lang="es"><![CDATA[Nivel óptimo multiobjetivo de metionina+cisteína en dietas para cerdos en crecimiento]]></article-title>
<article-title xml:lang="pt"><![CDATA[Otimização multiobjetivo do nível de metionina+cisteína em dietas para suínos em crescimento]]></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[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[Vaquera-Huerta]]></surname>
<given-names><![CDATA[Humberto]]></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 contrib-type="author">
<name>
<surname><![CDATA[Nieto-Aquino]]></surname>
<given-names><![CDATA[Rafael]]></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[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Tecnológico de Huejutla  ]]></institution>
<addr-line><![CDATA[Huejutla de Reyes Hidalgo]]></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>228</fpage>
<lpage>238</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-06902020000400228&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-06902020000400228&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-06902020000400228&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: The addition of synthetic methionine to growing pig diets should consider the requirements of the methionine+cysteine complex, as most cysteine is obtained through dietary methionine.  Objective: To determine an optimal level of methionine+cysteine (Met+Cys) in growing pig diets.  Methods: Ninety-nine hybrid (Yorkshire×Landrace×Duroc) barrows were used in a completely randomized design (initial body weight: 25.90±3.99 kg). Nine levels of Met+Cys (0.500, 0.525, 0.550, 0.575, 0.600, 0.625, 0.650, 0.675, and 0.700%) were evaluated during 35 days. To determine a multi-objective optimal level of Met+Cys, growth performance and strongly related carcass traits were evaluated.  Results: Average daily feed intake (ADFI) and feed:gain ratio (FGR) showed a linear response to the dietary Met+Cys level (p&lt;0.05), with estimated optimal concentration at 0.700%. Average daily gain (ADG) did not show any effect on the Met+Cys level (p&gt;0.05). Carcass characteristics were not affected by the Met+Cys concentration (p&gt;0.05). The multi-objective optimal level for ADG, ADFI, and FGR was 0.667% Met+Cys.  Conclusions: According to our results, 0.667% Met+Cys is the best concentration in diets for growing pigs.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Las dietas para cerdos en crecimiento deben adicionarse con metionina sintética para suplir los requerimientos del complejo metionina+cisteína (Met+Cis), pues ellos producen gran parte de la cisteína que requieren a partir de la metionina dietaría.  Objetivo: determinar el nivel óptimo multiobjetivo de Met+Cis en dietas para cerdos en crecimiento.  Métodos: noventa y nueve machos castrados híbridos (Yorkshire×Landrace×Duroc) se utilizaron en un diseño completamente al azar (peso vivo inicial: 25,90±3,99 kg). Se evaluaron nueve niveles de Met+Cys (0,500, 0,525, 0,550, 0,575, 0,600, 0,625, 0,650, 0,675 y 0,700%) durante 35 d. Para determinar el nivel óptimo multiobjetivo de Met+Cis se consideraron las variables de rendimiento de crecimiento y características de la canal que mantienen una fuerte interrelación.  Resultados: el promedio de consumo de alimento diario (ADFI) y la conversión alimenticia (FGR) mostraron una respuesta lineal al nivel de Met+Cis en la dieta (p&lt;0,05), con una concentración óptima estimada en 0,700%. El nivel de Met+Cis no afecto a la ganancia diaria de peso (ADG; p&gt;0,05). La concentración de Met+Cis tampoco afectó las características de la canal (p&gt;0,05). El nivel óptimo multi- objetivo de Met+Cis para ADFI, FGR y ADG fue 0,667%.  Conclusión: los resultados indican que 0,667% de Met+Cis es la mejor concentración en la dieta para cerdos en crecimiento.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Antecedentes: a adição de metionina em dietas para suínos em crescimento deve ser feita para atender às exigências do complexo metionina+cisteína (Met+Cis), porque grande parte da cisteína é obtida através da dieta com metionina.  Objetivo: determinar o nível multiobjetivo ótimo de Met+Cis em dietas para suínos em crescimento.  Métodos: noventa e nove suínos machos castrados híbridos (Yorkshire×Landrace×Duroc) foram utilizados em delineamento inteiramente casualizado, com peso inicial de 25,90±3,99 kg. Nove níveis de Met+Cis (0,500, 0,525, 0,550, 0,575, 0,600, 0,625, 0,650, 0,675 y 0,700%) foram avaliados em suínos em crescimento por 35 d. Para determinar o nível multiobjetivo ótimo de Met+Cis, foram consideradas as variáveis de comportamento de crescimento e características do canal que mantêm uma forte inter-relação.  Resultados: a ingestão média diária de alimentos (ADFI) e a conversão alimentar (FGR) mostraram uma resposta linear ao nível de Met+Cis na dieta (p&lt;0,05), estimando a concentração ótima em 0,700%. O ganho de peso diário (ADG) não mostrou efeito devido ao nível de Met+Cis na dieta (p&gt;0,05). As características da carcaça não foram afetadas pela concentração de Met+Cis na dieta (p&gt;0,05). Com ADFI, FGR e ADG, o nível ótimo de Met+Cis foi obtido, encontrando este nível em 0,667%.  Conclusões: os resultados indicam que 0,667% de Met+Cis é a melhor concentração na dieta para suínos em crescimento.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[carcass characteristics]]></kwd>
<kwd lng="en"><![CDATA[cysteine]]></kwd>
<kwd lng="en"><![CDATA[growth performance]]></kwd>
<kwd lng="en"><![CDATA[methionine]]></kwd>
<kwd lng="en"><![CDATA[nutritional requirements]]></kwd>
<kwd lng="en"><![CDATA[protein]]></kwd>
<kwd lng="en"><![CDATA[pigs]]></kwd>
<kwd lng="en"><![CDATA[sulfur amino acids]]></kwd>
<kwd lng="en"><![CDATA[swine nutrition]]></kwd>
<kwd lng="es"><![CDATA[aminoácidos azufrados]]></kwd>
<kwd lng="es"><![CDATA[características de la canal]]></kwd>
<kwd lng="es"><![CDATA[cerdos]]></kwd>
<kwd lng="es"><![CDATA[cisteína]]></kwd>
<kwd lng="es"><![CDATA[comportamiento productivo]]></kwd>
<kwd lng="es"><![CDATA[metionina]]></kwd>
<kwd lng="es"><![CDATA[nutrición de cerdos]]></kwd>
<kwd lng="es"><![CDATA[proteína]]></kwd>
<kwd lng="es"><![CDATA[requerimientos nutricionales]]></kwd>
<kwd lng="pt"><![CDATA[aminoácidos sulfurados]]></kwd>
<kwd lng="pt"><![CDATA[características de carcaça]]></kwd>
<kwd lng="pt"><![CDATA[cisteina]]></kwd>
<kwd lng="pt"><![CDATA[comportamento produtivo]]></kwd>
<kwd lng="pt"><![CDATA[exigências nutricionais]]></kwd>
<kwd lng="pt"><![CDATA[metionina]]></kwd>
<kwd lng="pt"><![CDATA[nutrição suína]]></kwd>
<kwd lng="pt"><![CDATA[porcos]]></kwd>
<kwd lng="pt"><![CDATA[proteína]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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<given-names><![CDATA[H]]></given-names>
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<article-title xml:lang=""><![CDATA[Methionine restriction on lipid metabolism and its possible mechanisms]]></article-title>
<source><![CDATA[Amino Acids]]></source>
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<volume>48</volume>
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</article>
