<?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>1665-1456</journal-id>
<journal-title><![CDATA[Biotecnia]]></journal-title>
<abbrev-journal-title><![CDATA[Biotecnia]]></abbrev-journal-title>
<issn>1665-1456</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Sonora, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-14562021000300030</article-id>
<article-id pub-id-type="doi">10.18633/biotecnia.v23i3.1412</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Performance of Litopenaeus vannamei at different levels of daily protein intake and carbohydrate/protein ratios in low fishmeal content feeds]]></article-title>
<article-title xml:lang="es"><![CDATA[Rendimiento de Litopenaeus vannamei a diferentes niveles de ingesta diaria de proteína y proporciones carbohidrato/proteína en alimentos formulados con baja inclusión de harina de pescado]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruvalcaba Márquez]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Antonio]]></surname>
<given-names><![CDATA[Eliza]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez Ruíz]]></surname>
<given-names><![CDATA[Píndaro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Casillas Hernández]]></surname>
<given-names><![CDATA[Ramón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mejía Ruíz]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Magallón Barajas]]></surname>
<given-names><![CDATA[Francisco Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigaciones Biológicas del Noroeste, S.C.  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Tecnológico de Sonora  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>23</volume>
<numero>3</numero>
<fpage>30</fpage>
<lpage>37</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-14562021000300030&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-14562021000300030&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-14562021000300030&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The increase in shrimp aquaculture production relates to the development of increasingly efficient formulated feeds and feed management strategies. Protein, considered the most important ingredient in feeds, represent the highest economic and environmental cost. Therefore, determining the appropriate amount of protein is essential to maintain a balance between performance, cost, and environment in aquaculture systems. The objective of this study was to determine the mathematical functions of Daily Protein Intake (DPI), to evaluate feeds with different Carbohydrate/Crude protein (CBH:CP) ratio and low inclusion of fishmeal for L. vannamei juveniles culture. The adjusted mathematical function that best represented aquaculture feeding practices was DPI=44.7(BW)-0.714. In the first experiment, four variants of DPI (80, 100, 120 and 140 %) at a constant CBH:CP ratio was carried out, finding the best performance at 120 %. In the second experiment, diets with five levels of CBH:CP (g CBH: g crude protein; 2.1, 1.5, 1.1, 0.8 and 0.6) with constant Lip:CP were evaluated using the same DPI function. The CBH:CP levels variation had a significant effect on growth parameters, feed conversion rate, nitrogen retention and protein, determining that feed with 2.1 CBH:CP ratio presents the best results when using DPI=53.64(BW)-0.714.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El aumento de la producción acuícola de camarón se ha logrado gracias al desarrollo de alimentos balanceados y estrategias de alimentación más eficientes. La proteína es considerada el insumo más importante para el desarrollo de los organismos, y representa el mayor costo económico y ambiental. El objetivo de este estudio fue determinar las funciones matemáticas de ingesta diaria de proteína (IDP), con objeto de utilizarlas para evaluar dietas con diferentes proporciones de carbohidratos/proteína cruda (CHO:CP) y baja inclusión de harina de pescado en juveniles de L. vannamei. El modelo matemático que representó de mejor manera las prácticas de alimentación acuícolas evaluadas fue IDP=44.7(PC)-0.714. En el primer experimento se utilizaron cuatro niveles de variación de IDP (80, 100, 120 y 140 %) a una proporción CHO:CP constante, encontrando el mejor rendimiento con IDP 120 %. En el segundo experimento; se evaluaron dietas con cinco niveles de CHO:CP (g CHO:g proteína cruda; 2.1, 1.5, 1.1, 0.8 y 0.6) usando la mejor función de IDP. La variación de los niveles de CHO:CP tuvieron un efecto significativo en crecimiento, el factor de conversión alimenticia, retención de nitrógeno y eficiencia proteica, determinando que la dieta con CHO:CP de 2.1 presentó mejores resultados con IDP=53.64(PC)-0.714.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Daily protein intake]]></kwd>
<kwd lng="en"><![CDATA[nitrogen retention]]></kwd>
<kwd lng="en"><![CDATA[L. vannamei performance]]></kwd>
<kwd lng="en"><![CDATA[carbohydrates:protein rates]]></kwd>
<kwd lng="es"><![CDATA[Ingesta diaria de proteína]]></kwd>
<kwd lng="es"><![CDATA[retención de nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[desempeño de L. vannamei]]></kwd>
<kwd lng="es"><![CDATA[proporción carbohidrato: proteína]]></kwd>
</kwd-group>
</article-meta>
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