<?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>2346-3775</journal-id>
<journal-title><![CDATA[Tropical Grasslands-Forrajes Tropicales]]></journal-title>
<abbrev-journal-title><![CDATA[Trop. Grassl.-Forrajes Trop.]]></abbrev-journal-title>
<issn>2346-3775</issn>
<publisher>
<publisher-name><![CDATA[Centro Internacional de Agricultura Tropical (CIAT)]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2346-37752019000200189</article-id>
<article-id pub-id-type="doi">10.17138/tgft(7)189-192</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Evaluating crude protein concentration of leucaena forage and the dietary legume content selected by cattle grazing leucaena and C4 grasses in northern Australia]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluando la concentración de proteína cruda de forraje de leucaena y la proporción de la leguminosa en la dieta seleccionada por ganado pastoreando mezclas de leucaena con gramíneas C4 en el norte de Australia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[HOPKINS]]></surname>
<given-names><![CDATA[KYLIE]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BOWEN]]></surname>
<given-names><![CDATA[MAREE]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[DIXON]]></surname>
<given-names><![CDATA[ROB]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[REID]]></surname>
<given-names><![CDATA[DAVID]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Queensland Government Department of Agriculture and Fisheries ]]></institution>
<addr-line><![CDATA[Parkhurst QLD]]></addr-line>
<country>Australia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,The University of Queensland Queensland Alliance for Agriculture and Food Innovation (QAAFI) ]]></institution>
<addr-line><![CDATA[Parkhurst QLD]]></addr-line>
<country>Australia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<volume>7</volume>
<numero>2</numero>
<fpage>189</fpage>
<lpage>192</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S2346-37752019000200189&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S2346-37752019000200189&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S2346-37752019000200189&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In Australia&#8217;s central and southern Queensland regions, Leucaena leucocephala-grass pastures produce substantially more beef and higher profits than grass-only pastures and annual forage crops. Near infrared reflectance spectroscopy (NIRS) provides a rapid and cost-effective approach to assessing quality of available forage as well as the quality of the diet selected by cattle, but existing calibrations have not been comprehensively validated for leucaena-grass pastures. This study examined the reliability of existing northern Australian calibrations for NIRS to predict the crude protein (CP) concentration of the edible fraction of the leucaena plant, and the proportion of leucaena in the diet of grazing cattle. Samples of edible leucaena and cattle feces were analyzed by NIRS and the predictions plotted in a linear regression and fitted to a 1:1 line with Dumas analysis of CP for leucaena forage, and mass spectrometry of &#948;13C for cattle feces. Results demonstrated that prediction of the CP concentration of leucaena forage and the proportion of leucaena in the diet of grazing cattle using current broad northern Australian NIRS forage calibrations were associated with substantial error. However, it is likely that these errors can be reduced with the inclusion in the calibration data set of more samples representing leucaena forage and feces of cattle grazing leucaena from varying locations, seasonal conditions and management strategies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En las regiones central y sur de Queensland, Australia, pasturas con Leucaena leucocephala y gramíneas producen sustancialmente más carne y mayores ingresos en comparación con pasturas de solo gramíneas o con cultivos forrajeros anuales. La espectroscopía de reflectancia en el infrarrojo cercano (NIRS) es un método rápido y económico para evaluar la calidad de forraje disponible, así como la calidad de la dieta seleccionada por el ganado. Sin embargo, las calibraciones disponibles no se han validado de manera exhaustiva para las pasturas de asociaciones de leucaena con gramíneas. En este estudio se examinó la confiabilidad de las calibraciones actualmente existentes en el norte de Australia para NIRS, para predecir la concentración de proteína cruda (PC) en la fracción comestible de plantas de leucaena y la proporción de leucaena en la dieta seleccionada por ganado pastando mezclas con gramíneas. Se analizaron por NIRS muestras de leucaena y de heces de ganado y se proyectaron las predicciones en una regresión lineal ajustadas a una línea 1:1 usando el método de análisis de Dumas para CP en el forraje de leucaena y la espectrometría de masas de &#948;13C para las heces de ganado. Los resultados demostraron que usando las calibraciones de NIRS que actualmente existen para forraje en el norte de Australia, las predicciones de la concentración de PC en el forraje de leucaena y de la proporción de leucaena en la dieta del ganado en pastoreo, estaban asociadas con errores sustanciales. Sin embargo, es probable que estos errores se puedan reducir si en el conjunto de datos de calibración se incluyen muestras adicionales representativas de forraje de leucaena y de heces de animales pastoreando leucaena provenientes de diferentes lugares, condiciones estacionales y estrategias de manejo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Diet quality]]></kwd>
<kwd lng="en"><![CDATA[forage quality]]></kwd>
<kwd lng="en"><![CDATA[near infrared reflectance spectroscopy]]></kwd>
<kwd lng="en"><![CDATA[tree legumes]]></kwd>
<kwd lng="en"><![CDATA[tropical pastures]]></kwd>
<kwd lng="es"><![CDATA[Calidad de dieta]]></kwd>
<kwd lng="es"><![CDATA[leguminosas arbóreas]]></kwd>
<kwd lng="es"><![CDATA[NIRS]]></kwd>
<kwd lng="es"><![CDATA[pastos tropicales]]></kwd>
<kwd lng="es"><![CDATA[valor nutritivo]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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