<?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>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282014000200001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Comportamiento productivo y niveles de ácidos grasos en la canal de corderos suplementados con Saccharomyces cerevisiae]]></article-title>
<article-title xml:lang="en"><![CDATA[Animal performance and fatty acids levels in lambs carcass suplemented with Saccharomyces cerevisiae]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gloria Trujillo]]></surname>
<given-names><![CDATA[Adrian]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Sánchez]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Mendo]]></surname>
<given-names><![CDATA[Omar]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Crosby Galván]]></surname>
<given-names><![CDATA[María Magdalena]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pinto Ruiz]]></surname>
<given-names><![CDATA[René]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meraz Romero]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Bribiesca]]></surname>
<given-names><![CDATA[J Efrén]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Colegio de Postgraduados Instituto de Recursos Genéticos y Productividad Postgrado en Ganadería]]></institution>
<addr-line><![CDATA[Montecillo Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma de Chiapas Facultad de Ciencias Agronómicas ]]></institution>
<addr-line><![CDATA[Tuxtla Gutiérrez Chiapas]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2014</year>
</pub-date>
<volume>1</volume>
<numero>2</numero>
<fpage>87</fpage>
<lpage>96</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282014000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282014000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282014000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los ácidos grasos (AG) saturados depositados en la canal de rumiantes representan un punto crítico en la alimentación humana por su relación con enfermedades cardiovasculares. Ante esto, Saccharomyces cerevisiae (Sc) representa una alternativa para modificar el perfil de AG en la carne debido a sus elevados niveles de AG insaturados. Con este antecedente, se realizó un experimento utilizando 30 corderos comerciales en crecimiento (20 ± 0.9 kg PV), distribuidos en tres grupos de 10 animales cada uno, y cada grupo fue asignado a uno de tres tratamientos evaluados: 0, 3 y 5g de Sc animal-1 d-1, respectivamente, con el objetivo de determinar el comportamiento productivo del animal, niveles plasmáticos de colesterol y AG depositados en la canal. Se utilizó un diseño completamente al azar, los datos se analizaron usando PROC GLM, considerando diez repeticiones por tratamiento, y las medias de tratamientos se compararon con la prueba de Tukey. La adición de 3g animal-1 d-1 de Sc disminuyó (p < 0.05) parcialmente el consumo de MS y conversión alimenticia en los periodos evaluados, sin afectar (P &gt; 0.05) la ganancia diaria de peso. Tampoco afectó (p &gt; 0.05) el área del músculo Longissimus dorsi, espesor de grasa dorsal y colesterol total en sangre. Al incrementar la dosis de Sc, disminuyó (p < 0.05) el nivel de ácido mirístico, palmítico, oleico y linoleico. Se no afecta el comportamiento productivo del animal, tampoco mejora el perfil de AG insaturados en la canal; sin embargo, disminuye las concentraciones de AG saturados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Saturated fatty acids (FA) in the carcass of ruminants represent a critical topic in human alimentation given by their relationship with cardiovascular diseases. In view of this, Saccharomyces cerevisiae (Sc) represents an alternative to modify the meat FA profile by increasing the ratio of deposited unsaturated FA, because of its high levels of unsaturated fatty acids. An experiment was carried out using 30 commercial growing lambs (20 ± 0.9 kg LW), distributed into three groups with 10 animals each, which was placed into one of three evaluated treatments: 0, 3, and 5g Sc animal-1 d-1, in order to determine the productive performance of the animals, plasmatic cholesterol levels, and FA deposited in the carcass. A totally random design was used. Data were analyzed using the PROC GLM, considering ten repetitions per treatment. Mean comparison of the treatments was done through the Tukey test. The results show that adding 3g animal-1 d-1 Sc partially decreased (p < 0.05) DM intake and food conversion in the evaluated periods without affecting (P &gt; 0.05) daily weight gain. It also did not affect (p &gt; 0.05) muscle area of the Longissimus dorsi, fat thickness and total cholesterol in the blood. As the Sc dose increased, the levels of myristic, palmitic, oleic, and linoleic acids decreased (p < 0.05). Sc doesnt affect the animal performance, neither improvement the carcass unsaturated FA profile, however, saturated FA concentrations decreases.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Saccharomyces cerevisiae]]></kwd>
<kwd lng="es"><![CDATA[corderos]]></kwd>
<kwd lng="es"><![CDATA[oleico]]></kwd>
<kwd lng="es"><![CDATA[canal]]></kwd>
<kwd lng="es"><![CDATA[grasa dorsal]]></kwd>
<kwd lng="en"><![CDATA[Saccharomyces cerevisiae]]></kwd>
<kwd lng="en"><![CDATA[lambs]]></kwd>
<kwd lng="en"><![CDATA[oleic]]></kwd>
<kwd lng="en"><![CDATA[carcass]]></kwd>
<kwd lng="en"><![CDATA[fat thickness]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ 
	    <p align="justify"><font face="verdana" size="4">Art&iacute;culos cient&iacute;ficos</font></p>

	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="center"><font face="verdana" size="4"><b>Comportamiento productivo y niveles de &aacute;cidos grasos en la canal de corderos suplementados con <i>Saccharomyces cerevisiae</i></b></font></p>

	    <p align="center"><font face="verdana" size="3">&nbsp;</font></p>

	    <p align="center"><font face="verdana" size="3"><b>Animal performance and fatty acids levels in lambs carcass suplemented with <i>Saccharomyces cerevisiae</i></b></font></p>

	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="center"><font face="verdana" size="2"><b><sup>1</sup>Adrian Gloria Trujillo, <sup>1*</sup>David Hern&aacute;ndez S&aacute;nchez, <sup>1</sup> Omar Hern&aacute;ndez Mendo, <sup>1</sup> Mar&iacute;a Magdalena Crosby Galv&aacute;n, <sup>2</sup> Ren&eacute; Pinto Ruiz, <sup>3</sup> Edgar Meraz Romero, <sup>1</sup> J Efr&eacute;n Ram&iacute;rez Bribiesca</b></font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup> <i>Postgrado en Ganader&iacute;a, Instituto de Recursos Gen&eacute;ticos y Productividad, Colegio de Postgraduados, Campus Motecillo, km 36.5, Carretera M&eacute;xico&#45;Texcoco, Montecillo, Municipio de Texcoco, Edo. de M&eacute;xico</i>.*<a href="mailto:sanchezd@colpos.mx">sanchezd@colpos.mx</a></font></p>

	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><sup><i>2</i></sup> <i>Facultad de Ciencias Agron&oacute;micas, Universidad Aut&oacute;noma de Chiapas.</i></font></p>

	    <p align="justify"><font face="verdana" size="2"><sup><i>3</i></sup> <i>Facultad de Medicina Veterinaria y Zootecnia. UNAM.</i></font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="justify"><font face="verdana" size="2">Art&iacute;culo cient&iacute;fico recibido: 18 de febrero de 2014    <br>
	Aceptado: 02 de mayo de 2014</font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>

	    <p align="justify"><font face="verdana" size="2">Los &aacute;cidos grasos (AG) saturados depositados en la canal de rumiantes representan un punto cr&iacute;tico en la alimentaci&oacute;n humana por su relaci&oacute;n con enfermedades cardiovasculares. Ante esto, <i>Saccharomyces cerevisiae</i> (Sc) representa una alternativa para modificar el perfil de AG en la carne debido a sus elevados niveles de AG insaturados. Con este antecedente, se realiz&oacute; un experimento utilizando 30 corderos comerciales en crecimiento (20 &plusmn; 0.9 kg PV), distribuidos en tres grupos de 10 animales cada uno, y cada grupo fue asignado a uno de tres tratamientos evaluados: 0, 3 y 5g de Sc animal<sup>&#45;1</sup> d<sup>&#45;1</sup>, respectivamente, con el objetivo de determinar el comportamiento productivo del animal, niveles plasm&aacute;ticos de colesterol y AG depositados en la canal. Se utiliz&oacute; un dise&ntilde;o completamente al azar, los datos se analizaron usando PROC GLM, considerando diez repeticiones por tratamiento, y las medias de tratamientos se compararon con la prueba de Tukey. La adici&oacute;n de 3g animal<sup>&#45;1</sup> d<sup>&#45;1</sup> de Sc disminuy&oacute; (p &lt; 0.05) parcialmente el consumo de MS y conversi&oacute;n alimenticia en los periodos evaluados, sin afectar (P &gt; 0.05) la ganancia diaria de peso. Tampoco afect&oacute; (p &gt; 0.05) el &aacute;rea del m&uacute;sculo <i>Longissimus dorsi,</i> espesor de grasa dorsal y colesterol total en sangre. Al incrementar la dosis de Sc, disminuy&oacute; (p &lt; 0.05) el nivel de &aacute;cido mir&iacute;stico, palm&iacute;tico, oleico y linoleico. Se no afecta el comportamiento productivo del animal, tampoco mejora el perfil de AG insaturados en la canal; sin embargo, disminuye las concentraciones de AG saturados.</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> <i>Saccharomyces cerevisiae,</i> corderos, oleico, canal, grasa dorsal.</font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>

	    <p align="justify"><font face="verdana" size="2">Saturated fatty acids (FA) in the carcass of ruminants represent a critical topic in human alimentation given by their relationship with cardiovascular diseases. In view of this, <i>Saccharomyces cerevisiae</i> (Sc) represents an alternative to modify the meat FA profile by increasing the ratio of deposited unsaturated FA, because of its high levels of unsaturated fatty acids. An experiment was carried out using 30 commercial growing lambs (20 &plusmn; 0.9 kg LW), distributed into three groups with 10 animals each, which was placed into one of three evaluated treatments: 0, 3, and 5g Sc animal<sup>&#45;1</sup> d<sup>&#45;1</sup>, in order to determine the productive performance of the animals, plasmatic cholesterol levels, and FA deposited in the carcass. A totally random design was used. Data were analyzed using the PROC GLM, considering ten repetitions per treatment. Mean comparison of the treatments was done through the Tukey test. The results show that adding 3g animal<sup>&#45;1</sup> d<sup>&#45;1</sup> Sc partially decreased (p &lt; 0.05) DM intake and food conversion in the evaluated periods without affecting (P &gt; 0.05) daily weight gain. It also did not affect (p &gt; 0.05) muscle area of the <i>Longissimus dorsi,</i> fat thickness and total cholesterol in the blood. As the Sc dose increased, the levels of myristic, palmitic, oleic, and linoleic acids decreased (p &lt; 0.05). Sc doesnt affect the animal performance, neither improvement the carcass unsaturated FA profile, however, saturated FA concentrations decreases.</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> <i>Saccharomyces cerevisiae,</i> lambs, oleic, carcass, fat thickness.</font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>

	    <p align="justify"><font face="verdana" size="2"><i>Saccharomyces cerevisiae</i> (Sc) ha sido ampliamente evaluada como probi&oacute;tico en estudios relacionados con la alimentaci&oacute;n animal, tanto en rumiantes como en no rumiantes. Los estudios desarrollados en rumiantes contemplan evaluaciones relacionadas con la fermentaci&oacute;n ruminal y su efecto en la respuesta animal (Sales 2011). Sin embargo, su utilizaci&oacute;n ha derivado en resultados variables (Duarte <i>et al.</i> 2012), encontr&aacute;ndose incrementos en las concentraciones de &aacute;cidos grasos vol&aacute;tiles despu&eacute;s de suplementar Sc en la dieta, sugiriendo una mejora en la eficiencia de la fermentaci&oacute;n ruminal y un mayor rendimiento debido a un incremento en la digesti&oacute;n de la fibra y en el consumo de materia seca (Zaworski <i>et al.</i> 2014). En contraste, en otras investigaciones el consumo y el pH ruminal no fueron afectados por el uso de la levadura (Allen y Ying 2012). Desafortunadamente, son pocos los reportes en la literatura que relacionan el efecto de Sc con los par&aacute;metros de calidad en la canal. Titi <i>et al.</i> (2008), reportaron incrementos en los niveles de grasa dorsal de corderos suplementados con Sc; sin embargo, no se menciona el efecto de la levadura sobre el perfil de la grasa depositada en la canal.</font></p>

	    <p align="justify"><font face="verdana" size="2">El cultivo de Sc se caracteriza por un perfil lip&iacute;dico constituido de entre un 75.42 a 80.25 % de &aacute;cidos grasos insaturados (palmitoleico y oleico) (Tronchoni <i>et al.</i> 2012), lo que sugiere una fuente alterna de &eacute;stos &aacute;cidos grasos en el tejido adiposo del animal y de alguna forma podr&iacute;a disminuir los niveles de colesterol total, lipoprote&iacute;nas de baja densidad y triglic&eacute;ridos en el plasma sangu&iacute;neo del consumidor (Gnoni <i>et al.</i> 2010), debido a un menor consumo de &aacute;cidos grasos saturados en la carne, asociados con la presencia de enfermedades cr&oacute;nicas y cardiacas (Teira <i>et al.</i> 2006, Weing&auml;rtner <i>et al.</i> 2011). Por lo anterior, el objetivo del presente estudio fue determinar el comportamiento productivo de corderos en crecimiento, el perfil de &aacute;cidos grasos depositados en la canal y los niveles circulantes de colesterol, cuando se suplementa con niveles crecientes de Sc.</font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>MATERIALES Y M&Eacute;TODOS</b></font></p>

	    <p align="justify"><font face="verdana" size="2">La presente investigaci&oacute;n se realiz&oacute; durante los meses de diciembre de 2010 y febrero de 2011, en la granja experimental del Colegio de Postgraduados, en Montecillo, Texcoco, Estado de M&eacute;xico. Se utilizaron 30 corderos criollos, con peso vivo inicial promedio de 20 &plusmn; 0.9 kg. Se formaron tres grupos homog&eacute;neos, con diez animales cada uno, y distribuidos aleatoriamente en jaulas individuales. Los corderos fueron desparasitados (Ivomec F<sup>&reg;</sup>) y vitaminados (Vigantol B<sup>&reg;</sup> y Vigantol ADE Fuerte<sup>&reg;</sup>) al inicio del estudio y 7 d posteriores.</font></p>

	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El estudio tuvo una duraci&oacute;n de 60 d, previo periodo de adaptaci&oacute;n de 10 d. Se evaluaron tres tratamientos (T) con 10 repeticiones, variando el nivel de <i>Saccharomyces cerevisiae</i> (Sc) Yea Sacc<sup>1026</sup> (levadura viable con una concentraci&oacute;n de 1 x 10<sup>8</sup> UFC g<sup>&#45;1</sup>): TI = Testigo, dieta comercial; T2 = TI + 3g de Sc animal<sup>&#45;1</sup> d<sup>&#45;1</sup> y T3 = TI + 5g de Sc animal<sup>&#45;1</sup> d<sup>&#45;1</sup>. Las dosis de Sc se establecieron con base a las recomendaciones de suplementaci&oacute;n de este aditivo alimenticio para corderos en engorda (Sales 2011), considerando un perfil de &aacute;cidos grasos de 8.8 % de mir&iacute;stico, 26.8 % de palm&iacute;tico, 6.1 % de este&aacute;rico, 25.7 % de oleico y 10.1 % de linoleico determinado por cromatograf&iacute;a de gases, seg&uacute;n Blagovic <i>et al.</i> (2001). Se utiliz&oacute; una dieta comercial para corderos en crecimiento con una composici&oacute;n proximal seg&uacute;n an&aacute;lisis de laboratorio de 91.74 % de materia seca (MS), 15.71 % de prote&iacute;na total (PT), 35.47 % de fibra detergente neutro (FDN) y 2.8 Mcal EM kg<sup>&#45;1</sup> MS, con un perfil de &aacute;cidos grasos de 14.69, 1.63, 29.93 y 53.74 % de palm&iacute;tico, este&aacute;rico, oleico y linoleico, respectivamente. El agua se ofreci&oacute; <i>ad libitum</i> y la dieta dos veces por d&iacute;a (8:00 y 16:00 h) ofreciendo el 5 % del peso vivo.</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Comportamiento productivo</b></font></p>

	    <p align="justify"><font face="verdana" size="2">Para calcular el consumo de materia seca (CMS) se pes&oacute; diariamente el alimento ofrecido y rechazado. Los borregos se pesaron en ayuno cada 15 d para calcular la ganancia diaria de peso (GDP), realizando cuatro pesajes a lo largo del experimento, que conformaron los periodos de evaluaci&oacute;n. Los datos de CMS y GDP, se usaron para calcular la conversi&oacute;n alimenticia (CA).</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Caracter&iacute;sticas de la canal</b></font></p>

	    <p align="justify"><font face="verdana" size="2">Se evalu&oacute; el &aacute;rea de m&uacute;sculo <i>Longissimus dorsi</i> (LD) y el espesor de la grasa (EG) a la altura de la 12<sup>a</sup> y 13<sup>a</sup> costilla, con un equipo de ultrasonograf&iacute;a marca Medison Sonovet 600<sup>&reg;</sup>, modelo SV&#45;600 con un Transductor lineal de 7.5 Mhz. Las lecturas se obtuvieron en mil&iacute;metros cuadrados para el &aacute;rea del ojo de la costilla y en mil&iacute;metros para el espesor de grasa dorsal (Delfa <i>et al.</i> 1995).</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Nivel de colesterol total en plasma sangu&iacute;neo</b></font></p>

	    <p align="justify"><font face="verdana" size="2">Se determin&oacute; el nivel de colesterol total en sangre. Para ello se tomaron muestras de sangre obtenidas de la vena yugular, utilizando tubos de recolecci&oacute;n Vacutainer de 13 x 100 mm, y posteriormente fueron almacenadas en un contenedor con hielo, hasta ser procesadas. Las muestras se centrifugaron a 3200 x g durante 20 min en una centrifuga EBA 21 de Hettich, se extrajo el suero sangu&iacute;neo y fue congelado hasta su an&aacute;lisis. Se utiliz&oacute; el m&eacute;todo enzim&aacute;tico de punto final (Trinder 1969). La concentraci&oacute;n de colesterol total (CT) (mg dL<sup>&#45;1</sup>) se midi&oacute; en un espectrofot&oacute;metro Modelo Var&iacute;an Marca CARY 1E a una absorbancia de 505 nm.</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Perfil de &aacute;cidos grasos de <i>Saccharomyces cerevisiae</i> y en la canal</b></font></p>

	    <p align="justify"><font face="verdana" size="2">El perfil de &aacute;cidos grasos se determin&oacute; del m&uacute;sculo <i>Longissimus dorsi,</i> con base al m&eacute;todo descrito por Folch <i>et al.</i> (1956). Las muestras se analizaron en un cromat&oacute;grafo de gases HP 6890 con un inyector HP 7683, equipado con una columna SPMR 2560, con dimensiones de 100 x 0.25 mm x 0.2 <i>&micro;</i>m (pel&iacute;cula) a una presi&oacute;n de 199.94 kPa utilizando helio como gas acarreador (con un Make up de 18 mL min<sup>&#45;1</sup> a una presi&oacute;n de 199.94 kPa). La temperatura del inyector y detector fue de 250 y 260&deg;C, respectivamente. La rampa de temperatura del horno se elev&oacute; de 110&deg;C x 1 min a 240&deg;C x 10 min. El contenido de &aacute;cidos grasos se expres&oacute; en mg 100 g carne<sup>&#45;1</sup>.</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>An&aacute;lisis estad&iacute;stico</b></font></p>

	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Se utiliz&oacute; un dise&ntilde;o completamente al azar con tres tratamientos y 10 repeticiones. Los datos se analizaron mediante un procedimiento PROC GLM de SAS (SAS 2004). Para el an&aacute;lisis de las variables CMS, GDP y CA se utiliz&oacute; el peso vivo inicial como covariable. La comparaci&oacute;n m&uacute;ltiple de medias de tratamientos se realiz&oacute; mediante la prueba de Tukey (&#945; = 0.05).</font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>RESULTADOS</b></font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Comportamiento productivo</b></font></p>

	    <p align="justify"><font face="verdana" size="2">Los resultados muestran que la adici&oacute;n de 3g d<sup>&#45;1</sup> de Sc en la dieta redujo (P &lt; 0.05; <a href="/img/revistas/era/v1n2/a1t1.jpg" target="_blank">Tabla 1</a>) el CMS con respecto al grupo testigo durante el segundo periodo de evaluaci&oacute;n. As&iacute; mismo, para la media general, el CMS fue de 1.25 vs 1.22 kg d<sup>&#45;1</sup> al suplementar 0 y 3g d<sup>&#45;1</sup> animal<sup>&#45;1</sup> de Sc. No obstante, la adici&oacute;n de 5 g d<sup>&#45;1</sup> de Sc (T3) no produjo cambios (p &gt; 0.05) en esta variable. Para la GDP la adici&oacute;n de Sc no evidenci&oacute; (p &gt; 0.05) diferencias entre tratamientos. Mientras que la CA fue 21.7 % mejor (P &lt; 0.05) en el T3 en comparaci&oacute;n con el T2 en el tercer periodo de evaluaci&oacute;n, sin embargo, ambos tratamientos no fueron diferentes al testigo.</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Caracter&iacute;sticas de la canal</b></font></p>

	    <p align="justify"><font face="verdana" size="2">El &aacute;rea del m&uacute;sculo <i>Longissimus dorsi</i> (AML) no present&oacute; cambios (p &gt; 0.05; <a href="/img/revistas/era/v1n2/a1t2.jpg" target="_blank">Tabla 2</a>) entre tratamientos por efecto de la suplementaci&oacute;n con Sc. Este comportamiento fue consistente con la media general. As&iacute; mismo, los valores de espesor de grasa (EG) tuvieron un comportamiento similar, sin diferencias (p &gt; 0.05) entre tratamientos (<a href="/img/revistas/era/v1n2/a1t2.jpg" target="_blank">Tabla 2</a>).</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Nivel de colesterol total en plasma sangu&iacute;neo</b></font></p>

	    <p align="justify"><font face="verdana" size="2">Los valores de colesterol total (CT) en plasma sangu&iacute;neo de los corderos alimentados con niveles crecientes de Sc no mostraron cambios (p &gt; 0.05;<a href="/img/revistas/era/v1n2/a1t2.jpg" target="_blank">Tabla 2</a>) entre tratamientos, con promedios de 1.69, 1.52 y 1.7 mmol L<sup>&#45;1</sup> para T1, T2 y T3, respectivamente.</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Caracter&iacute;sticas de la canal</b></font></p>

	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El nivel de este&aacute;rico no fue diferente (p &gt; 0.05; <a href="#a1t3">Tabla 3</a>) entre tratamientos al adicionar Sc, pero si se obtuvo el nivel m&aacute;s bajo (p &lt; 0.05) en el perfil del &aacute;cido mir&iacute;stico, palm&iacute;tico, oleico y linoleico depositados en la canal, a medida que se incrementaba el nivel de levadura a 5g animal<sup>&#45;1</sup> d<sup>&#45;1</sup>.</font></p>

	    <p align="center"><font face="verdana" size="2"><a name="a1t3"></a>    <br>
	<img src="/img/revistas/era/v1n2/a1t3.jpg"></font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>DISCUSI&Oacute;N</b></font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Comportamiento productivo</b></font></p>

	    <p align="justify"><font face="verdana" size="2">El CMS en corderos suplementados con 3g d<sup>&#45;1</sup> de Sc fue menor (p &lt; 0.05) en comparaci&oacute;n con el grupo testigo. Este efecto es consistente con lo observado por Junniper <i>et al.</i> (2008), quienes reportaron que a medida que se incluye Sc en la dieta, el CMS se reduce al optimizarse el aprovechamiento de nutrientes (Fonty y Chaucheyras 2006), lo que permite al animal cubrir sus requerimientos nutricionales con menor cantidad de alimento (Di Francia <i>et al.</i> 2008, Moya <i>et al.</i> 2009). Sin embargo, esto contrasta con lo observado en el T3 (5g d<sup>&#45;1</sup> Sc) y con lo reportado por Haddad y Goussous (2005), Macedo <i>et al.</i> (2006) e Issakowicz <i>et al.</i> (2013) quienes indican que no hay efecto sobre esta variable al suplementar Sc en la dieta de corderos. Es por ello, que factores como el tipo de alimentaci&oacute;n determinan el modo de acci&oacute;n de la levadura, explicando que en dietas a base de forraje, este aditivo genera mayor CMS, en comparaci&oacute;n con dietas a base de concentrado (Kawas <i>et al.</i> 2007), ya que se incrementa la actividad bacteriana y la digestibilidad de la fibra (Zebeli <i>et al.</i> 2012, Hossain <i>et al.</i> 2012). La GDP no fue afectada (p &gt; 0.05) por la suplementaci&oacute;n con Sc y los valores obtenidos se mantuvieron dentro del intervalo reportado para corderos en engordas comerciales (200 a 300g d<sup>&#45;1</sup>) (Souz<i>a et al</i>. 2013). Al respecto se reporta que la respuesta en GDP por adicionar Sc en la dieta de borregos, solo es positiva cuando los niveles de prote&iacute;na son menores a 15 % (NRC 2007, Tripathi y Karim 2011). Esta respuesta coincide con lo reportado por Titi <i>et al.</i> (2008), quienes al ofrecer una dieta con 16.8 % de prote&iacute;na cruda obtuvieron valores similares entre el grupo testigo y el tratamiento con Sc (261 y 266g d<sup>&#45;1</sup>, respectivamente). Congruente con estos reportes, en el presente estudio, la adici&oacute;n de Sc no afect&oacute; (p &gt; 0.05) la GDP entre tratamientos, explic&aacute;ndose por el nivel de prote&iacute;na de la dieta ofrecida (15.7 %). La falta de respuesta (p &gt; 0.05) en la GDP y un CMS de 1.17 kg d<sup>&#45;1</sup> (p &lt; 0.05), propiciaron, consecuentemente, m&iacute;nima respuesta (p &lt; 0.05) en la CA. Comportamiento similar reportaron Payandeh y Kafilzadeh (2007) y Sales (2011) quienes evaluaron Sc en una dieta para corderos.</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>&Aacute;rea del m&uacute;sculo <i>Longissimus dorsi</i> y espesor de grasa dorsal</b></font></p>

	    <p align="justify"><font face="verdana" size="2">La suplementaci&oacute;n con Sc no gener&oacute; cambios (p &gt; 0.05) entre tratamientos al evaluar el AML y el EG. Consistente con esto, Kawas <i>et al.</i> (2007), Titi <i>et al.</i> (2008) y Rodrigues <i>et al.</i> (2013) reportaron una tendencia similar para corderos en finalizaci&oacute;n. Est&aacute; documentado que factores como la edad, peso, raza y sexo del animal afectan el AML (Wilches <i>et al.</i> 2011), la cual disminuye cuando se incrementa la deposici&oacute;n de grasa dorsal, causada por la ingesti&oacute;n de dietas a base de grano (Seabrook <i>et al.</i> 2011). La falta de respuesta en estas variables, se puede explicar por la relaci&oacute;n inversa que existe entre el AML y el EG, al disminuir la deposici&oacute;n de grasa cuando se incrementa la deposici&oacute;n de m&uacute;sculo (Rufino <i>et al.</i> 2013), debido a una mayor utilizaci&oacute;n de la energ&iacute;a y s&iacute;ntesis de prote&iacute;na provocada por una mayor cantidad de prote&iacute;na no degradada a nivel ruminal (Ponnampalam <i>et al.</i> 2001), la cual puede determinar la ausencia de diferencias significativas en el grado de engrasamiento, rendimiento y caracter&iacute;sticas de la canal, cuando los animales se alimentan bajo un mismo r&eacute;gimen alimenticio (Manso <i>et al.</i> 2009).</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>Colesterol total en plasma sangu&iacute;neo</b></font></p>

	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">De acuerdo a los resultados obtenidos en este trabajo, Sc (p &gt; 0.05) no tiene efecto sobre las concentraciones plasm&aacute;ticas de colesterol, ya que con niveles de 3 y 5 g animal<sup>&#45;1</sup> d<sup>&#45;1</sup>, las concentraciones de este metabolito no cambiaron y fueron similares a los valores biol&oacute;gicos reportados para corderos en crecimiento alimentados con dietas a base de concentrado (1.61 a 4.98 mmol L<sup>-1</sup>) (Bodas et al. 2011); aun cuando los niveles de suplementaciÃ³n de Sc se incrementan a 15 y 30 g animal<sup>&#45;1</sup> d<sup>&#45;1</sup>, los niveles plasm&aacute;ticos de colesterol no son afectados (Pal <i>et al.</i> 2010). En este sentido, los resultados obtenidos en el presente estudio y los reportados en la literatura evidencian que la capacidad hipocolesterolemica de Sc es nula (Van Den Top <i>et al.</i> 1994, Beynen <i>et al.</i> 2000), se&ntilde;alando que el efecto principal de la levadura se limita a nivel ruminal (Sales 2011).</font></p>

    <p align="justify"><font face="verdana" size="2"><b>Perfil de &aacute;cidos grasos en la canal</b></font></p>

	    <p align="justify"><font face="verdana" size="2">La concentraci&oacute;n de &aacute;cido oleico en la canal de corderos disminuy&oacute; (P &lt; 0.05) a medida que se incrementaron los niveles de Sc en una dieta a base de concentrado. Esto contrasta con la concentraci&oacute;n de &aacute;cido oleico reportada para corderos alimentados bajo condiciones intensivas, la cual se estima en los 669.7 a 860 mg 100 g<sup>&#45;1</sup> de carne (Nuernberg <i>et al.</i> 2008, Komprda <i>et al.</i> 2012). Est&aacute; documentado que dietas a base de concentrado y altas en prote&iacute;na explican que el &aacute;cido oleico represente hasta un 40 % del total de los &aacute;cidos grasos sintetizados en la canal de rumiantes (Duckett <i>et al.</i> 1993, Ju&aacute;rez <i>et al.</i> 2008) debido a las altas concentraciones de este&aacute;rico que llegan al duodeno (Loor <i>et al.</i> 2002) y son transformadas a &aacute;cido oleico por la actividad de la enzima delta 9 desaturasa (Castro <i>et al.</i> 2005), presente en bacterias ruminales, tejido adiposo e h&iacute;gado (Valenzuela <i>et al.</i> 2009). Sin embargo, existen factores que inhiben esta enzima a diferentes niveles del metabolismo, como es el caso de la represi&oacute;n de los genes OLE1 en Sc (Cort&eacute;s <i>et al.</i> 2009) y estearoil coenzima A desaturasa (SCD) en corderos (Daniel <i>et al.</i> 2004), al inhibir estos genes, disminuye la deposici&oacute;n de &aacute;cido palm&iacute;tico, este&aacute;rico y oleico a nivel celular como ocurri&oacute; en el presente estudio, debido a que los principales sustratos para la s&iacute;ntesis de oleico usados por la enzima delta&#45;9&#45;desaturasa son el palmitoil&#45;CoA y la estearoil&#45;CoA (Wood <i>et al.</i> 2008). En este sentido, la presencia de los &aacute;cidos grasos de Sc pudo ejercer el efecto supresor del gen SCD y causar baja deposici&oacute;n de oleico como ocurri&oacute; en este estudio al suplementar con niveles crecientes de Sc.</font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>CONCLUSIONES</b></font></p>

	    <p align="justify"><font face="verdana" size="2">Con base a las condiciones en que se desarroll&oacute; el estudio, se concluye que dosis crecientes de Sc en la dieta de corderos no afectan el comportamiento productivo del animal, tampoco mejoran el perfil de &aacute;cidos grasos insaturados en la canal; sin embargo, disminuye las concentraciones de &aacute;cidos grasos saturados, relacionados con la incidencia de enfermedades cardiovasculares. Por lo que se sugiere realizar mayor investigaci&oacute;n que permita elucidar la din&aacute;mica y los efectos de Sc en la deposici&oacute;n de &aacute;cidos grasos en la canal.</font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    <p align="justify"><font face="verdana" size="2"><b>AGRADECIMIENTOS</b></font></p>

    <p align="justify"><font face="verdana" size="2">Los autores expresan sincero agradecimiento a la LPI 7, Inocuidad, Calidad de Alimentos y Bioseguridad, y a la LPI 11, Sistemas de Producci&oacute;n Agr&iacute;cola, Pecuaria, Forestal, Acu&iacute;cola y Pesquera del Colegio de Postgraduados, por el apoyo financiero para realizar esta investigaci&oacute;n.</font></p>

	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>

	    ]]></body>
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