<?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>0120-0135</journal-id>
<journal-title><![CDATA[Revista de Ciencias Agrícolas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Cienc. Agr.]]></abbrev-journal-title>
<issn>0120-0135</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Nariño]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-01352022000300020</article-id>
<article-id pub-id-type="doi">10.22267/rcia.202239e.193</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Statistical analysis alternatives to validate hematic parameters in dairy under tropical conditions]]></article-title>
<article-title xml:lang="es"><![CDATA[Alternativas de análisis estadístico para la validación de parámetros hemáticos en ganado lechero bajo condiciones tropicales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos]]></surname>
<given-names><![CDATA[Rómulo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vélez]]></surname>
<given-names><![CDATA[Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[Katherine]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa]]></surname>
<given-names><![CDATA[Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ordoñez]]></surname>
<given-names><![CDATA[Angela Lizeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Palmira ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Palmira ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Servicio Nacional de Aprendizaje, SENA  ]]></institution>
<addr-line><![CDATA[Buga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Palmira ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Palmira ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>39</volume>
<numero>spe</numero>
<fpage>20</fpage>
<lpage>34</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-01352022000300020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-01352022000300020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-01352022000300020&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The hematic parameters of cows selected for milk production in grazing under tropic conditions were analyzed based on six experimental studies. The major objective was to determine statistical analysis alternatives that could be used in the study of physiological, environmental or genetic variations. The parameters analyzed were hematocrit, hemoglobin concentrations and counts of polymorphonuclear cells (i.e., eosinophils, basophils, neutrophils and lymphocytes). Initially 972 data from adult cows with productions considered medium-high in the context of local dairy production were analyzed. After the information decanting process, 415 records were used. These data corresponded to a sampling period from 30 days before calving to day 105 postpartum, with determinations made fortnightly. Blood collection was made every two weeks and each moment was defined as a period. Different analytical techniques were applied in searching to extract the best information from the data and that could be reused in the future. The best type of analysis corresponded to the Random Forest (RF) technique, clustering, and analysis of variance.The effect of an indicator of energy metabolism (non-esterified fatty acids - NEFA), an indicator of protein metabolism (total protein - TP) of 10 collection periods, three breed groups and three types of nutritional management given to the animals on the blood variables were analyzed. Multivariate correlation and machine learning methods were used to extract information from the data. Results indicated that hematological behavior change throughout close up dry cow, transition period and first phase of lactation. No high direct or inverse correlation were found among variables. Hematocrit and hemoglobin levels can be estimated from variables associated with metabolic indicators and blood components. Further studies are required to elucidate the hematic behavior of dairy cows during the transition period.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN A partir de seis trabajos experimentales se analizó la información correspondiente a los parámetros hemáticos de vacas seleccionadas para producción lechera y que pastan en condiciones de trópico bajo, con el objetivo de visualizar alternativas de análisis estadísticos que pudieran ser empleados en el estudio de variaciones fisiológicas, ambientales o genéticas. Los parámetros analizados fueron hematocrito, concentración de hemoglobina y las determinaciones celulares de polimorfonucleares: eosinófilos, basófilos, neutrófilos y linfocitos. En total se analizaron 972 datos provenientes de vacas adultas con producciones consideradas como medio - altas en el contexto de la producción lechera local. Luego del proceso de decantación de información se emplearon 415 registros, correspondientes a un periodo muestral desde 30 días antes del parto hasta el día 105 posparto, con determinaciones realizadas quincenalmente, cada momento de colecta sanguínea fue denominado como periodo. Se aplicaron diferentes técnicas analíticas buscando extraer la mejor información proveniente de los datos y que pudiera ser replicada en futuros análisis. Se analizó el efecto de un indicador del metabolismo energético (ácidos grasos no esterificados - NEFA), un indicador del metabolismo proteico (proteínas totales -PT-), de diez periodos de colecta, de tres grupos raciales y de tres tipos de manejo nutricional dado a los animales sobre las variables hemáticas. Se encontró efecto del periodo de colecta de la muestra. El mejor tipo de análisis correspondió a la técnica de Random Forest (RF), agrupamiento por cluster y análisis de varianza.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Dairy cattle]]></kwd>
<kwd lng="en"><![CDATA[hematology]]></kwd>
<kwd lng="en"><![CDATA[metabolites]]></kwd>
<kwd lng="en"><![CDATA[statistical models]]></kwd>
<kwd lng="en"><![CDATA[transition period]]></kwd>
<kwd lng="en"><![CDATA[tropical conditions.]]></kwd>
<kwd lng="es"><![CDATA[Bovinos lecheros]]></kwd>
<kwd lng="es"><![CDATA[condiciones tropicales]]></kwd>
<kwd lng="es"><![CDATA[hematología]]></kwd>
<kwd lng="es"><![CDATA[metabolitos]]></kwd>
<kwd lng="es"><![CDATA[modelos estadísticos]]></kwd>
<kwd lng="es"><![CDATA[periodo de transición.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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