<?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>2079-3480</journal-id>
<journal-title><![CDATA[Cuban Journal of Agricultural Science]]></journal-title>
<abbrev-journal-title><![CDATA[Cuban J. Agric. Sci.]]></abbrev-journal-title>
<issn>2079-3480</issn>
<publisher>
<publisher-name><![CDATA[Editorial del Instituto de Ciencia Animal]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2079-34802021000200006</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Energy-mineral supplementation during the gestation-lactation transition period in Holstein cows]]></article-title>
<article-title xml:lang="es"><![CDATA[Suplementación energético-mineral durante el período de transición gestación-lactancia en vacas Holstein]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Balarezo-Urresta]]></surname>
<given-names><![CDATA[Luis Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Noval-Artiles]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Díaz]]></surname>
<given-names><![CDATA[Juan Ramón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Politécnica del Carchi Facultad de Industrias Agropecuarias y Ciencias Ambientales Escuela de Desarrollo Integral Agropecuario]]></institution>
<addr-line><![CDATA[ Carchi]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Central &#8220;Marta Abreu&#8221; de Las Villas Facultad de Ciencias Agropecuarias Departamento de Medicina veterinaria y Zootecnia]]></institution>
<addr-line><![CDATA[Santa Clara Villa Clara]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>55</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2079-34802021000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2079-34802021000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2079-34802021000200006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In order to determine the effect of energy-mineral supplementation during the gestation-lactation transition period on the metabolic profile and reproductive indicators of Holstein cows,a total of 32 animals, between the third and fourth lactation, and body condition &#8805; 3.5 were selected. The experiment was performed in Carchi province, Ecuador, during the rainy season. Two groups of 16 animals each were randomly formed. The same foods were supplied to all, and those in the treated group were supplemented with corn, in an amount of 1.0 kg DM, 30 days before parturition, and 2.0 kg DM at the beginning of lactation until 60 days postpartum, plus parenteral supplementation of 20 mL of kyrofosfan.The hematochemical parameters and reproductive indicators were determined, which were compared by t- Student test for independent samples. The contributions of Cu and Zn did not cover the requirements in both study groups. The metabolizable energy was deficient in the animals that were not supplemented with corn. In the cows from the treated group, the concentrations in blood serum of P, Cu, Zn and cholesterol, and the body condition were higher (P &lt;0.05) at 30 and 60 days postpartum. Total proteins increased (P &lt;0.05) at 60 days postpartum, while betehydroxybutyrate decreased (P &lt;0.01) at 30 days postpartum.The supplementation decreased (P &lt;0.05) the parturition-first service interval, the services per gestation (P &lt;0.001) and the parturition-conception and parturition-parturition intervals. It is concluded that energy-mineral supplementation improves the metabolic profile and reproductive indicators.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Para determinar el efecto de la suplementación energético-mineral durante el período de transición gestación-lactancia en el perfil metabólico y los indicadores reproductivos de vacas Holstein, se seleccionaron 32 animales, entre tercera y cuarta lactancia, y condición corporal &#8805; 3,5. El experimento se desarrolló en la provincia Carchi, Ecuador, durante el período lluvioso. Se conformaron aleatoriamente dos grupos, de 16 animales cada uno. Se suministraron los mismos alimentos a todos, y a los del grupo tratado se les suplementó con maíz, en cantidad de 1.0 kg MS, 30 días antes del parto, y 2,0 kg MS al inicio de la lactancia hasta los 60 días posparto, más suplementación parenteral de 20 mL de kirofosfan. Se determinaron los parámetros hematoquímicos y los indicadores reproductivos, los que se compararon mediante prueba de t-Student para muestras independientes. Los aportes de Cu y Zn no cubrieron los requerimientos en ambos grupos de estudio. La energía metabolizable fue deficiente en los animales que no se suplementaron con maíz. En las vacas del grupo tratado, las concentraciones en suero sanguíneo de P, Cu, Zn y colesterol, y la condición corporal fueron superiores (P &lt; 0.05) a los 30 y 60 días posparto. Las proteínas totales aumentaron (P &lt; 0.05) a los 60 días posparto, mientras que el betehidroxibutirato disminuyó (P &lt; 0.01) a los 30 días posparto. La suplementación disminuyó (P &lt; 0.05) el intervalo parto-primer servicio, los servicios por gestación (P &lt; 0,001) y los intervalos parto-concepción y parto-parto. Se concluye que la suplementación energético-mineral mejora los indicadores perfil metabólico y reproductivos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[energy]]></kwd>
<kwd lng="en"><![CDATA[protein]]></kwd>
<kwd lng="en"><![CDATA[deficit]]></kwd>
<kwd lng="en"><![CDATA[metabolic profile]]></kwd>
<kwd lng="en"><![CDATA[reproductive indicators]]></kwd>
<kwd lng="es"><![CDATA[energía]]></kwd>
<kwd lng="es"><![CDATA[proteína]]></kwd>
<kwd lng="es"><![CDATA[déficit]]></kwd>
<kwd lng="es"><![CDATA[perfil metabólico]]></kwd>
<kwd lng="es"><![CDATA[indicadores reproductivos]]></kwd>
</kwd-group>
</article-meta>
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