<?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>0864-0394</journal-id>
<journal-title><![CDATA[Pastos y Forrajes]]></journal-title>
<abbrev-journal-title><![CDATA[Pastos y Forrajes]]></abbrev-journal-title>
<issn>0864-0394</issn>
<publisher>
<publisher-name><![CDATA[Estación Experimental de Pastos y Forrajes Indio Hatuey]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-03942020000200150</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto del ensilaje de Avena sativa L. en la productividad de vacas lactantes en pastoreo]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of the silage from Avena sativa L. on the productivity of grazing lactating cows]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro-Rincón]]></surname>
<given-names><![CDATA[Edwin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cardona-Iglesias]]></surname>
<given-names><![CDATA[Juan Leonardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Oviedo]]></surname>
<given-names><![CDATA[Filadelfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valenzuela-Chiran]]></surname>
<given-names><![CDATA[Martín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria - Agrosavia Centro de Investigación Obonuco ]]></institution>
<addr-line><![CDATA[Pasto - Obonuco, Nariño ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>43</volume>
<numero>2</numero>
<fpage>150</fpage>
<lpage>158</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-03942020000200150&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-03942020000200150&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-03942020000200150&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Objetivo:  Evaluar el efecto del nivel de oferta de ensilaje de Avena sativa L., variedad Altoandina, en el consumo de materia seca total de la dieta y la productividad de las vacas lactantes en pastoreo en el municipio de Pasto, Colombia.  Materiales y Métodos:  Se utilizaron 12 vacas F1 (Kiwi cross x Holstein), de 450 kg de peso vivo promedio, en un diseño de sobre cambio. Se establecieron dos tratamientos, que correspondieron a dos niveles de inclusión de ensilaje: 20 (T1) y 35 % (T2) del consumo de materia seca total. Se evaluaron períodos de 12 días, siete de adaptación y cinco de medición. Se estimó el consumo de materia seca, la calidad y la producción de leche, así como los indicadores del perfil metabólico (glucosa, colesterol y nitrógeno ureico en sangre). La información se procesó mediante un análisis de varianza y la prueba de comparación de medias Tukey.  Resultados:  Hubo efecto significativo (p &lt; 0,05) para las variables consumo de materia seca total del ensilaje (2,8 vs 1,4 kg/MS/vaca/día para 35 y 20 % de inclusión de ensilaje de avena, respectivamente). La producción de leche fue de 14,9 vs 14,3 kg/vaca/día, para 35 y 20 % de inclusión de ensilaje de avena, respectivamente. El nitrógeno ureico en leche y el nitrógeno ureico en sangre resultaron superiores en T1 con respecto a T2 (15,8 y 3,1 vs 14,5 y 2,8, respectivamente).  Conclusiones:  La introducción en la dieta de ensilaje de A. sativa, variedad Altoandina (20 y 35 %), afectó el consumo de materia seca total. Además, la inclusión de 35 % del ensilaje influyó positivamente en la producción de leche, al aumentar en 4 %.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objective:  To evaluate the effect of the offer level of silage from Avena sativa L., Altoandina variety, on the total dry matter intake of the diet and the productivity of lactating cows under grazing conditions in the Pasto municipality, Colombia.  Materials and Methods:  Twelve F1 cows (Kiwi cross x Holstein) were used, of 450 kg of average live weight, in a crossover design. Two treatments were established, which corresponded to two silage inclusion levels: 20 (T1) and 35 % (T2) of the total dry matter intake. Periods of 12 days were evaluated, seven of adaptation and five for measurement. Dry matter intake, milk quality and production, as well as the indicators of the metabolic profile (glucose, cholesterol and blood ureic nitrogen) were estimated. The information was processed through a variance analysis and Tukey&#8217;s mean comparison test.  Results:  There was significant effect (p &lt; 0,05) for the variables total dry matter intake of the silage (2,8 vs. 1,4 kg/DM/cow/day for 35 and 20 % of inclusion of oat silage, respectively). The milk production was 14,9 vs. 14,3 kg/cow/day, for 35 and 20 % of inclusion of oat silage, respectively. The milk ureic nitrogen and blood ureic nitrogen were higher in T1 with regards to T2 (15,8 and 3,1 vs. 14,5 and 2,8, respectively).  Conclusions:  The introduction in the diet of silage of A. sativa, Altoandina variety (20 and 35 %), affected the total dry matter intake. In addition, the inclusion of 35 % of the silage influenced positively milk production, increasing by 4 %.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[consumo]]></kwd>
<kwd lng="es"><![CDATA[ensilaje]]></kwd>
<kwd lng="es"><![CDATA[oferta forrajera]]></kwd>
<kwd lng="es"><![CDATA[producción lechera]]></kwd>
<kwd lng="en"><![CDATA[intake]]></kwd>
<kwd lng="en"><![CDATA[silage]]></kwd>
<kwd lng="en"><![CDATA[forage offer]]></kwd>
<kwd lng="en"><![CDATA[milk production]]></kwd>
</kwd-group>
</article-meta>
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