<?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>0122-8706</journal-id>
<journal-title><![CDATA[Ciencia y Tecnología Agropecuaria]]></journal-title>
<abbrev-journal-title><![CDATA[Cienc. Tecnol. Agropecuaria]]></abbrev-journal-title>
<issn>0122-8706</issn>
<publisher>
<publisher-name><![CDATA[Corporación Colombiana de Investigación Agropecuaria - Corpoica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-87062023000300002</article-id>
<article-id pub-id-type="doi">10.21930/rcta.vol24_num3_art:2858</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Metabolic Profile of F1 Holstein × Zebu Lactating Dairy Cows Under Grazing Supplemented with Two Non-Protein Nitrogen Sources]]></article-title>
<article-title xml:lang="es"><![CDATA[Perfil metabólico de vacas lactantes F1 Holstein × Cebú a pastoreo suplementadas con dos fuentes de nitrógeno no proteico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora-Luna]]></surname>
<given-names><![CDATA[Robert Emilio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Angulo]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Eslava-Tovar]]></surname>
<given-names><![CDATA[José Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Isea-Chávez]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Darghan]]></surname>
<given-names><![CDATA[Aquiles Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Pontifica Universidad Católica de Chile  ]]></institution>
<addr-line><![CDATA[Santiago ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Experimental del Táchira  ]]></institution>
<addr-line><![CDATA[San Cristóbal ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>24</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-87062023000300002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-87062023000300002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-87062023000300002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Pastures dedicated to cattle production in Venezuela have a low crude protein concentration. One of the nutritional strategies to correct the forage protein deficit is using non-protein nitrogen in the diet. To evaluate the effect of two non-protein nitrogen sources on the metabolic profile of lactating dairy cows, 31 F1 Holstein × Zebu multiparous cows averaging 419 ± 46 kg body weight and 17.1 ± 3.3 kg milk&#903;animal&#903;d-1 were randomly assigned to two treatments for 91 days: 1) 59 g&#903;animal-1&#903;d-1 of urea and 2) 64 g&#903;animal-1&#903;d-1 of Optigen II® as slow-release urea (SRU). The animals were grazing (2.12 AU&#903;ha-1) on Urochloa decumbens, U. humidicola, and U. brizantha(7.98-9.61 % CP) and supplied with 4 kg&#903;animal&#903;d-1 of concentrate (15 % CP), and 108, 60, and 108 g&#903;animal&#903;d-1 of mineral, molasses, and bypass fat, respectively. Glucose, total protein, albumin, cholesterol, urea, and &#946;-hydroxybutyrate concentrations, aspartate aminotransferase, and gamma-glutamyl transferase activities were determined in blood serum samples every 28 days. ANOVA analyzed data in a completely randomized design with repeated measures. There were no differences among treatments in the parameters investigated; however, collecting time influenced all of them. No treatment × time interactions were found except for albumin concentration, higher in urea at day 0. The results indicate that under the conditions assayed in the present work, Optigen II® offers no advantage over urea concerning blood indicators of energy and protein metabolism and hepatic functionality in dairy cows.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los pastos dedicados a la producción ganadera en Venezuela tienen una baja concentración de proteína cruda. Una de las estrategias nutricionales para corregir el déficit de proteína del forraje es el uso de nitrógeno no proteico en la dieta. Con el objetivo de evaluar el efecto de dos fuentes nitrógeno no proteico sobre el perfil metabólico de vacas lecheras lactantes, 31 vacas F1 Holstein × Cebú multíparas con promedios de 419 ± 46 kg de peso vivo y 17,1 ± 3,3 kg leche/animal&#903;d-1 se asignaron de forma aleatoria a dos tratamientos durante 91 días: 1) 59 g&#903;animal&#903;d-1de urea y 2) 64 g&#903;animal&#903;d-1de Optigen II® como fuente de urea de degradación lenta (UDL). Los animales pastaron (2,12 AU&#903;ha-1) en Urochloa decumbens,U. humidicola y U. brizantha (7,98-9,61 % PC); adicionalmente, se les suministraba 4 kg&#903;animal&#903;d-1 de alimento concentrado (15 % PC) y 108, 60 y 108 g&#903;animal&#903;d-1 de mineral, melaza y grasa sobrepasante, respectivamente. Cada 28 días se determinó en suero sanguíneo las concentraciones de glucosa, proteínas totales, albúmina, colesterol, urea, &#946;-hidroxibutirato, y la actividad de las enzimas aspartato aminotransferasa y gamma-glutamil transferasa. Los datos se analizaron mediante ANAVAR bajo un diseño completamente al azar con medidas repetidas. No hubo diferencias entre los tratamientos en las variables estudiadas; sin embargo, el tiempo de muestreo influyó en todas ellas. No se observaron interacciones tratamiento × tiempo, excepto para la concentración de albúmina, que fue mayor en urea en el día 0. Los resultados obtenidos indican que bajos las condiciones experimentales del presente trabajo, Optigen II® no ofrece ventajas adicionales sobre la urea con respecto a los indicadores sanguíneos del metabolismo energético y proteico y de la funcionalidad hepática en vacas lecheras.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[animal feeding]]></kwd>
<kwd lng="en"><![CDATA[blood serum]]></kwd>
<kwd lng="en"><![CDATA[dairy cows]]></kwd>
<kwd lng="en"><![CDATA[supplementation]]></kwd>
<kwd lng="en"><![CDATA[tropical pasture]]></kwd>
<kwd lng="en"><![CDATA[urea]]></kwd>
<kwd lng="es"><![CDATA[alimentación animal]]></kwd>
<kwd lng="es"><![CDATA[pasto tropical]]></kwd>
<kwd lng="es"><![CDATA[suero sanguíneo]]></kwd>
<kwd lng="es"><![CDATA[suplementación]]></kwd>
<kwd lng="es"><![CDATA[urea]]></kwd>
<kwd lng="es"><![CDATA[vacas lecheras]]></kwd>
</kwd-group>
</article-meta>
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