<?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>0122-8706</journal-id>
<journal-title><![CDATA[Ciencia y Tecnología Agropecuaria]]></journal-title>
<abbrev-journal-title><![CDATA[Cienc. Tecnol. Agropecuaria]]></abbrev-journal-title>
<issn>0122-8706</issn>
<publisher>
<publisher-name><![CDATA[Corporación Colombiana de Investigación Agropecuaria - Corpoica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-87062021000100016</article-id>
<article-id pub-id-type="doi">10.21930/rcta.vol22_num1_art:1921</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effects of different protein and sulfur amino acids levels on layers&#8217; production efficiency]]></article-title>
<article-title xml:lang="es"><![CDATA[Efectos de diferentes niveles de proteína y aminoácidos azufrados en el rendimiento productivo de gallinas ponedoras]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arquiñego-Alderete]]></surname>
<given-names><![CDATA[Edwin Gustavo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cantaro-Segura]]></surname>
<given-names><![CDATA[Jose Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cumpa-Gavidia]]></surname>
<given-names><![CDATA[Marcial Estanislao]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Agraria La Molina  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Perú</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Agraria La Molina  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Perú</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Agraria La Molina  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Perú</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<volume>22</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-87062021000100016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-87062021000100016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-87062021000100016&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This research aims to evaluate the effect of three protein levels (15.0, 16.5, and 18.0%) and three sulfur amino acid levels (0.71, 0.78, and 0.86%) on hens&#8217; production efficiency and egg quality. It used Hy-Line Brown layers (n = 216) at 25 weeks of age. The nine treatments were distributed in a completely randomized design with a 3 x 3 factorial pattern. The experiment lasted 12 weeks. The best egg production was reported by hens fed 18.0% protein, while the best egg weight value was obtained with 15.0% protein. The highest weight gain was achieved with diets containing 16.5% protein. Except for weight gain, there were no significant effects (p &gt; 0.05) of methionine + cystine levels on the factors studied, obtaining the most significant weight gain with a methionine + cystine level of 0.86%. The highest returns were attained with protein and sulfur amino acid levels of 16.5 and 0.71% or 15.00 and 0.86%, respectively.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de la presente investigación fue evaluar el efecto de tres niveles de proteína (15,0%, 16,5% y 18,0%) y tres niveles de aminoácidos azufrados (0,71%, 0,78%, 0,86%) sobre el comportamiento productivo y calidad de los huevos en gallinas. Se emplearon 216 gallinas de postura de la línea Hy-Line Brown de 25 semanas de edad, en la que los nueve tratamientos fueron distribuidos en un diseño completamente al azar con un arreglo factorial de 3 × 3, con una duración del experimento de 12 semanas. La mayor producción de huevos fue registrada en las aves alimentadas con 18,0% de proteína bruta (PB), mientras que el mayor peso de huevo fue obtenido con 15,0% de PB. La mayor ganancia de peso se obtuvo con las dietas que contenían 16,5% de PB. A excepción de la ganancia de peso, no se observaron efectos significativos (p &gt; 0,05) de los niveles de metionina + cistina sobre los factores estudiados, donde la mayor ganancia de peso se obtuvo con el nivel de metionina + cistina de 0,86%. Las mayores retribuciones económicas se obtuvieron con los niveles de proteína y aminoácidos azufrados de 16,50% y 0,71% o 15,00% y 0,86%, respectivamente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[eggs]]></kwd>
<kwd lng="en"><![CDATA[essential amino acids]]></kwd>
<kwd lng="en"><![CDATA[crude protein]]></kwd>
<kwd lng="en"><![CDATA[cystine]]></kwd>
<kwd lng="en"><![CDATA[methionine]]></kwd>
<kwd lng="en"><![CDATA[sulfur amino acids]]></kwd>
<kwd lng="es"><![CDATA[aminoácidos esenciales]]></kwd>
<kwd lng="es"><![CDATA[aminoácidos sulfurados]]></kwd>
<kwd lng="es"><![CDATA[cistina]]></kwd>
<kwd lng="es"><![CDATA[huevos]]></kwd>
<kwd lng="es"><![CDATA[metionina]]></kwd>
<kwd lng="es"><![CDATA[proteína bruta]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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