<?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>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212021000100249</article-id>
<article-id pub-id-type="doi">10.15517/am.v32i1.41096</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Eficacia de un sustituto de calostro sobre la transferencia de inmunidad pasiva en terneras]]></article-title>
<article-title xml:lang="en"><![CDATA[Efficacy of a colostrum substitute on passive immunity transfer in calves]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Elizondo-Salazar]]></surname>
<given-names><![CDATA[Jorge Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zumbado-Alpízar]]></surname>
<given-names><![CDATA[Luis Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Zinpro Animal Nutrition  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<volume>32</volume>
<numero>1</numero>
<fpage>249</fpage>
<lpage>260</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212021000100249&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212021000100249&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212021000100249&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. Los sustitutos de calostro han aumentado su popularidad en Costa Rica como una alternativa al calostro de mala calidad, reservas limitadas, o para romper el ciclo de transmisión de ciertas enfermedades infecciosas. Sin embargo, es importante asegurarse de que estos productos sean efectivos y capaces de proporcionar concentraciones séricas de IgG adecuadas. Objetivo. Evaluar la eficacia de un sustituto del calostro versus el calostro materno en terneras de lechería. Materiales y métodos. El experimento se llevó a cabo durante el primer semestre del 2019 en sesenta terneras Jersey (veinte terneras por tratamiento) que fueron asignadas aleatoriamente a uno de tres tratamientos que consistieron en suplementar a las terneras con: 3 l de calostro materno (tratamiento 1), 335 g de sustituto de calostro que contenía 150 g de IgG (tratamiento 2) y 2 l de calostro materno + 110 g de suplemento de calostro que contenía 55 g de IgG (tratamiento 3). Se recogieron muestras de sangre de todas las terneras 48 h después de la administración del calostro y se analizaron las concentraciones de proteína sérica total e IgG. Resultados. Las terneras alimentadas con calostro materno y con calostro materno + suplemento de calostro tuvieron concentraciones más altas de proteína sérica total (p&lt;0,05) y concentraciones de IgG en comparación con las terneras alimentadas con el sustituto de calostro; sin embargo, las terneras que recibieron el sustituto de calostro lograron obtener una transferencia adecuada de inmunidad pasiva (&gt;10 g de IgG) y tuvieron una mayor eficiencia aparente de absorción. No hubo diferencias significativas (p&gt;0,05) con respecto a los parámetros de crecimiento y el estado de salud de las terneras. Conclusiones. El reemplazador de calostro evaluado proporcionó una adecuada concentración de IgG en las terneras evaluadas y se podría utilizar como una alternativa cuando no se cuenta con calostro materno.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. Colostrum substitutes have increased in popularity in Costa Rica as an alternative to poor quality colostrum, limited colostrum reserves, or to break the cycle of transmission of certain infectious diseases. However, it is important to make sure that these products are effective and capable of providing adequate serum IgG concentration. Objective. To evaluate the efficacy of a colostrum substitute versus maternal colostrum in dairy heifer calves. Materials and methods. The experiment was carried out during the first semester of 2019 in sixty Jersey calves (twenty calves per treatment) that were randomly assigned to 1 of 3 treatment groups that consisted of supplementing the calves with: 3 l of maternal colostrum (group 1), 335 g of a colostrum replacer product containing 150 g of IgG (group 2), and 2 l of maternal colostrum + 110 g of colostrum supplement containing 55 g of IgG (group 3). Blood samples from all calves were collected 48 h after colostrum administration and analyzed for total serum protein and IgG concentration. Results. Calves fed maternal colostrum and maternal colostrum + colostrum supplement had significantly higher (p&lt;0.05) total serum protein and IgG concentration compared to calves fed the colostrum substitute product; however, calves that received the colostrum replacer achieved an adequate passive transfer of immunity (&gt; 10 g of IgG) and had a higher apparent efficiency of absorption. There were no significant differences (p&gt;0.05) on calf growth parameters and health status of the calves. Conclusions. The evaluated colostrum replacer product provided an adequate IgG concentration in the assessed Jersey heifer calves and could be used as an alternative when there is no maternal colostrum.]]></p></abstract>
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<kwd lng="es"><![CDATA[cría de ganado]]></kwd>
<kwd lng="es"><![CDATA[refractómetría]]></kwd>
<kwd lng="es"><![CDATA[inmunoensayos]]></kwd>
<kwd lng="es"><![CDATA[inmunoglobulinas]]></kwd>
<kwd lng="en"><![CDATA[calf rearing]]></kwd>
<kwd lng="en"><![CDATA[refractometry]]></kwd>
<kwd lng="en"><![CDATA[immunoassays]]></kwd>
<kwd lng="en"><![CDATA[immunoglobulins]]></kwd>
</kwd-group>
</article-meta>
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