<?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>0120-0690</journal-id>
<journal-title><![CDATA[Revista Colombiana de Ciencias Pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Colom Cienc Pecua]]></abbrev-journal-title>
<issn>0120-0690</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-06902021000400305</article-id>
<article-id pub-id-type="doi">10.17533/udea.rccp.v34n4a07</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Preservation of sugarcane silage with urea and calcium oxide: performance and metabolic efficiency of dairy cows]]></article-title>
<article-title xml:lang="es"><![CDATA[Conservación del ensilaje de caña de azúcar con urea y óxido de calcio: rendimiento y eficiencia metabólica en vacas lecheras]]></article-title>
<article-title xml:lang="pt"><![CDATA[Preservação da silagem de cana-de-açúcar com ureia e óxido de cálcio: desempenho e eficiência metabólica de vacas leiteiras]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martins]]></surname>
<given-names><![CDATA[Susi C S G]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvalho]]></surname>
<given-names><![CDATA[Gleidson G P]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pires]]></surname>
<given-names><![CDATA[Aureliano J V]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leite]]></surname>
<given-names><![CDATA[Laudí C]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lago-Novais]]></surname>
<given-names><![CDATA[Daiane]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oliveira]]></surname>
<given-names><![CDATA[Ronaldo L]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cirne]]></surname>
<given-names><![CDATA[Luis G A]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvalho]]></surname>
<given-names><![CDATA[Bruna M A]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Federal de Educação, Ciência e Tecnologia do Norte de Minas Gerais  ]]></institution>
<addr-line><![CDATA[Salinas Minas Gerais]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal da Bahia Departamento de Zootecnia ]]></institution>
<addr-line><![CDATA[Salvador Bahia]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade Estadual do Sudoeste da Bahia Departamento de Zootecnia ]]></institution>
<addr-line><![CDATA[Itapetinga Bahia]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Federal do Recôncavo da Bahia Departamento de Zootecnia ]]></institution>
<addr-line><![CDATA[Cruz das Almas Bahia]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidade Federal do Oeste do Pará Departamento de Zootecnia ]]></institution>
<addr-line><![CDATA[Santarém Pará]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidade Federal de Minas Gerais Instituto de Ciências Agrárias ]]></institution>
<addr-line><![CDATA[Montes Claros Minas Gerais]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>34</volume>
<numero>4</numero>
<fpage>305</fpage>
<lpage>315</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-06902021000400305&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-06902021000400305&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-06902021000400305&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Inclusion of urea and calcium oxide (CaO) during sugarcane ensilage has been hypothesized to improve dairy cow performance.  Objective: To evaluate the use of urea and calcium oxide as additives to preserve sugarcane silage quality and determine whether they improve dairy cow performance and metabolic efficiency.  Methods: Four diets were used: sugarcane silage without additive (SS), sugarcane silage with 10 g/kg urea (SU), sugarcane silage with 5 g/kg urea + 5 g/kg CaO (SUC), and sugarcane silage with 10 g/kg CaO (SC). Eight crossbred cows at approximately 100 days of lactation were distributed in two 4x4 Latin squares, and their diets were formulated to reach an average milk production of 15 kg/day.  Results: Dry matter, non-fibrous carbohydrates, organic matter, total carbohydrates, and total digestible nutrient intake were the highest (p&lt;0.05) for the cows fed SC. Urinary excretion of nitrogen was higher (p&lt;0.05) for cows fed diets based on SUC than those fed diets with SC. Milk urea nitrogen content was the highest (p&lt;0.05) in animals fed SU diets. Nitrogen balance was positive in all treatments; however, the microbial protein synthesis was low for all diets.  Conclusions: The diet with SU showed the highest nitrogen loss through the milk. Among the evaluated silages, those with SC and SUC are recommended to promote a high intake of nutritional components.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: La hipótesis fue que una dieta con combinación de urea y óxido de calcio (CaO) para el ensilaje de caña de azúcar, puede mejorar la producción de vacas lecheras cruzadas.  Objetivo: Evaluar la urea y el óxido de calcio como aditivos para preservar la calidad del ensilaje de caña de azúcar y determinar si mejoran el rendimento y la eficiencia metabólica de vacas lecheras.  Métodos: Cuatro dietas fueron utilizadas: ensilaje de caña de azúcar sin aditivo (SS), ensilaje de caña de azúcar con 10 g/kg de urea (SU), ensilaje de caña de azúcar con 5 g/kg de urea + 5 g/kg de CaO (SUC) y ensilaje de caña de azúcar con 10 g/kg de CaO (SC). Ocho vacas cruzadas fueron evaluadas con una producción media de leche de 15 kg/día y aproximadamente 100 días de lactación, distribuidas en dos cuadrados latinos 4x4.  Resultados: El consumo de materia seca, carbohidratos no fibrosos, materia orgánica, carbohidratos totales y nutrientes digestibles totales fue mayor (p&lt;0,05) cuando las vacas fueron alimentadas con dietas conteniendo SC. La excreción de nitrógeno en la orina fue mayor (p&lt;0,05) cuando las vacas fueron alimentadas con dietas basadas en SUC que las alimentadas con dietas SC. El nitrógeno ureico de la leche fue mayor (p&lt;0,05) en animales alimentados con dietas con SU. El balance de nitrógeno fue positivo en todos los tratamientos, sin embargo, la síntesis de proteína microbiana fue baja para todas las dietas.  Conclusión: La dieta con SU presentó la mayor pérdida de nitrógeno por medio de la leche. Entre los ensilajes evaluados, aquellos con SC y SUC son recomendados por promover un mayor consumo de componentes nutricionales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Antecedentes: A hipótese foi que uma dieta com a mistura de ureia e óxido de cálcio (CaO) para a ensilagem de cana de açúcar, poderia melhorar a produção de vacas leiteiras mestiças.  Objetivo: Avaliar ureia e óxido de cálcio como aditivos para preservar a qualidade da silagem de cana de açúcar: melhoria da produção e eficiência metabólica de vacas leiteiras.  Métodos: Quatro dietas foram utilizadas: silagem de cana de açúcar sem aditivo (SS), silagem de cana de açúcar com 10 g/kg de ureia (SU), silagem de cana de açúcar com 5 g/kg de ureia + 5 g/kg de CaO (SUC) e silagem de cana de açúcar com 10 g/kg de CaO (SC). Oito vacas mestiças foram avaliadas com uma produção media de 15 kg/dia e aproximadamente 100 dias de lactação, distribuídas em dois quadrados latinos 4x4.  Resultados: O consumo de matéria seca, carboidratos não fibrosos, matéria orgânica, carboidratos totais e nutrientes digestíveis totais foi maior (p&lt;0,05) quando as vacas foram alimentadas com dietas contendo SC. A excreção de nitrogênio na urina foi maior (p&lt;0,05) quando as vacas foram alimentadas com dietas baseadas em SUC do que aqueles animais alimentados com dietas SC. O nitrogênio ureico do leite foi maior (p&lt;0,05) em animais alimentados com dietas com SU. O balanço de nitrogênio foi positivo em todos os tratamentos, no entanto, a síntese de proteína microbiana foi baixa para todas as dietas.  Conclusão: A dieta com SU apresentou maior perda de nitrogênio por meio do leite. Entre as silagens avaliadas, aquelas com SC e SUC são recomendadas por promover maior consumo de componentes nutricionais.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[dairy cows]]></kwd>
<kwd lng="en"><![CDATA[digestibility]]></kwd>
<kwd lng="en"><![CDATA[ensiling]]></kwd>
<kwd lng="en"><![CDATA[ensilage]]></kwd>
<kwd lng="en"><![CDATA[feed additives]]></kwd>
<kwd lng="en"><![CDATA[intake]]></kwd>
<kwd lng="en"><![CDATA[metabolic efficiency]]></kwd>
<kwd lng="en"><![CDATA[microbial purines]]></kwd>
<kwd lng="en"><![CDATA[milk urea nitrogen]]></kwd>
<kwd lng="en"><![CDATA[nitrogen balance]]></kwd>
<kwd lng="en"><![CDATA[performance]]></kwd>
<kwd lng="en"><![CDATA[silage]]></kwd>
<kwd lng="en"><![CDATA[urea]]></kwd>
<kwd lng="es"><![CDATA[aditivos alimentarios]]></kwd>
<kwd lng="es"><![CDATA[balance de nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[desempeño]]></kwd>
<kwd lng="es"><![CDATA[digestibilidad]]></kwd>
<kwd lng="es"><![CDATA[eficiencia metabólica]]></kwd>
<kwd lng="es"><![CDATA[ensilaje]]></kwd>
<kwd lng="es"><![CDATA[ensilado]]></kwd>
<kwd lng="es"><![CDATA[ingestión]]></kwd>
<kwd lng="es"><![CDATA[nitrógeno ureico en la leche]]></kwd>
<kwd lng="es"><![CDATA[purinas microbianas]]></kwd>
<kwd lng="es"><![CDATA[urea]]></kwd>
<kwd lng="es"><![CDATA[vacas lecheras]]></kwd>
<kwd lng="pt"><![CDATA[aditivos alimentares]]></kwd>
<kwd lng="pt"><![CDATA[balanço de nitrogênio]]></kwd>
<kwd lng="pt"><![CDATA[desempenho]]></kwd>
<kwd lng="pt"><![CDATA[digestibilidade]]></kwd>
<kwd lng="pt"><![CDATA[eficiência metabólica]]></kwd>
<kwd lng="pt"><![CDATA[ensilagem]]></kwd>
<kwd lng="pt"><![CDATA[ingestão]]></kwd>
<kwd lng="pt"><![CDATA[nitrogênio ureico no leite]]></kwd>
<kwd lng="pt"><![CDATA[purinas microbianas]]></kwd>
<kwd lng="pt"><![CDATA[silagem]]></kwd>
<kwd lng="pt"><![CDATA[ureia]]></kwd>
<kwd lng="pt"><![CDATA[vacas leiteiras]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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