<?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>S2007-90282017000300419</article-id>
<article-id pub-id-type="doi">10.19136/era.a4n12.1293</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Peri-Conceptional undernutrition in twin bearing ewes: Effect on early fetal growth and birth weight]]></article-title>
<article-title xml:lang="es"><![CDATA[Desnutrición peri-concepcional en ovejas con gestación gemelar: Efecto sobre el crecimiento fetal temprano y peso al nacimiento]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vicente-Pérez]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Osorio-Marín]]></surname>
<given-names><![CDATA[Yolanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Baca]]></surname>
<given-names><![CDATA[María A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avendaño-Reyes]]></surname>
<given-names><![CDATA[Leonel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa-Calderón]]></surname>
<given-names><![CDATA[Abelardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mellado]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lara-Rivera]]></surname>
<given-names><![CDATA[Ana L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meza-Herrera]]></surname>
<given-names><![CDATA[Cesar A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Macías-Cruz]]></surname>
<given-names><![CDATA[Ulises]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California lnstituto de Ciencias Agrícolas ]]></institution>
<addr-line><![CDATA[Mexicali B.C]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro Departamento de Nutrición Animal ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Chapingo Unidad Regional Universitaria de Zonas Áridas ]]></institution>
<addr-line><![CDATA[Bermejillo Durango]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>4</volume>
<numero>12</numero>
<fpage>419</fpage>
<lpage>429</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282017000300419&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282017000300419&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282017000300419&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: A total of 48 Katahdin x Pelibuey multiparous ewes were used to evaluate the effect of nutritional restriction (40 %) before (30 d, RT), after (50 d, TR) or both periods (80 d, RR) compared with a control group on maternal body status, early fetal growth and lamb birth weights. Only twin bearing ewes were selected at d 50 of pregnancy for fetal measurements by ultrasonography and record of birth weight. Compared with control ewes, lower (p &lt; 0.05) weight and body condition score had RT and RR ewes at mating time, likewise, TR and RR ewes at d 50 post-conception. There were mainly differences between fetuses from control and RT ewes, being higher (p &lt; 0.05) the vesicular, abdominal and fetal area, as well as crown-rump length and birth weight for RT fetuses. In conclusión, preconception undernutrition positively altered the early fetal growth and lamb birth weights in hair ewes pregnant with twins.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se usaron 48 ovejas multíparas Katahdin x Pelibuey para evaluar el efecto del 40 % de restricción nutricional antes (30 d, RT), después (50 d, TR) o antes y después de la concepción (80 d, RR), comparado con un grupo testigo sobre el estado corporal materno, crecimiento fetal temprano y peso al nacimiento de las crías. Solo ovejas con preñez gemelar fueron seleccionadas al día 50 post-monta para mediciones fetales por ultrasonografía y registro de peso al nacimiento. Las ovejas RT y RR tuvieron menor (p &lt; 0.05) peso y condición corporal al empadre, mientras que las ovejas TR y RR a los 50 días post-concepción tuvieron menor peso que las ovejas de los otros tratamientos. Se observaron diferencias entre fetos de ovejas testigo y RT, siendo mayor (p &lt; 0.05) el área vesicular, abdominal y fetal, además de la longitud cráneo-caudal y los pesos al nacimiento en fetos de ovejas RT. La desnutrición pre-concepción alteró de forma positiva el crecimiento fetal temprano y el peso al nacimiento de las crías en ovejas de pelo con preñez gemelar.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Fetal growth]]></kwd>
<kwd lng="en"><![CDATA[cotyledons]]></kwd>
<kwd lng="en"><![CDATA[twin pregnancy]]></kwd>
<kwd lng="en"><![CDATA[crown-rump length]]></kwd>
<kwd lng="en"><![CDATA[nutritional restriction]]></kwd>
<kwd lng="es"><![CDATA[Crecimiento fetal]]></kwd>
<kwd lng="es"><![CDATA[cotiledones]]></kwd>
<kwd lng="es"><![CDATA[gemelos]]></kwd>
<kwd lng="es"><![CDATA[longitud cráneo-caudal]]></kwd>
<kwd lng="es"><![CDATA[restricción nutricional]]></kwd>
</kwd-group>
</article-meta>
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