<?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>0377-9424</journal-id>
<journal-title><![CDATA[Agronomía Costarricense]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Costarricense]]></abbrev-journal-title>
<issn>0377-9424</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica. Colegio de Ingenieros y Agrónomos. Ministerio de Agricultura y Ganadería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0377-94242015000200007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Relación entre el estado serológico a leucosis bovina enzoótica y parámetros reproductivos en hatos lecheros especializados de Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Relationship between the serological status towards enzootic bovine leucosis and reproductive parameters in specialized dairy herds in Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dávila]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Beita]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dolz]]></surname>
<given-names><![CDATA[Gaby]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional  ]]></institution>
<addr-line><![CDATA[ Heredia]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Agricultura y Ganadería  ]]></institution>
<addr-line><![CDATA[ Rivas]]></addr-line>
<country>NI</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Escuela de Medicina Veterinaria ]]></institution>
<addr-line><![CDATA[ Heredia]]></addr-line>
<country>CR</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>39</volume>
<numero>2</numero>
<fpage>7</fpage>
<lpage>18</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0377-94242015000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0377-94242015000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0377-94242015000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenSe realizó un estudio longitudinal y analítico para determinar la relación entre el estado serológico al virus de la leucosis bovina enzoótica (VLBE) y los parámetros reproductivos, en 26 fincas lecheras de Costa Rica usuarias del programa VAMPP Bovino. Se realizó un primer muestreo en 2006-2007 en animales mayores de 6 meses de edad; luego, en 2009, se realizó el segundo muestreo en las vacas seronegativas del 2006-2007. Se calculó la incidencia acumulada (IA) global y por finca y, mediante Chi-cuadrado, se realizó la comparación de IA, según raza y número de lactancia. La relación entre el estado serológico al VLBV y el intervalo entre partos (IEP), servicios por concepción (SPC) y días abiertos (DA) por grupos de lactancia y raza, se determinó con la prueba de Kruskal-Wallis. La incidencia global fue de 21,8% (173/794), con 38,5% de las fincas con incidencias mayores al 40%. La tasa de seroconversión en vacas con 1-2 lactancias (23,5%) fue diferente a la de &#8805; 6 lactancias (p=0,03). Las medias raza Holstein x Jersey (H4J4) presentaron la mayor incidencia (33,3%), seguidas por las Holstein (27,1%). Según los finqueros, en las 26 fincas (100%) se utilizaba una aguja y un guante de palpación por animal; sin embargo, el 53,8% mostraron incidencias superiores al 15%. En general, hubo tendencia a menores IEP en seronegativas con respecto a seropositivas y seroconvertidas, especialmente en seropositivas de 1-2 lactancias (p=0,017) y de 3-5 lactancias (p=0,038). Sin clasificar por número de lactancia o raza, las seropositivas y seroconvertidas necesitan más SPC (p=0,03); esta misma tendencia (no significativa), se observó en DA. Así, se pudo comprobar alguna relación entre el estado a VLBE y el IEP y SPC, no así con DA, aunque no hubo significancia estadística en algunas de las diferencias encontradas, al ser mejores los parámetros en las seronegativas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractAn analytical longitudinal study was conducted to determine the cumulative incidence, and the relationship of the serostatus towards enzootic bovine leukosis virus (EBLV) and reproductive parameters, in 26 dairy farms in Costa Rica using the VAMPP Bovine information system. A first sampling was carried out in 20062007 in animals older than 6 months old; then, in 2009, a second sampling was performed in all cows seronegative in 2006-2007. The overall and farmspecific cumulative incidence were calculated; then, comparisons of these were performed by race and parity number, using the Chi-square test. The relationship of EBLV status with the calving interval (CI), services per conception (SPC) and days open (DO) by parity number and race groups, was determined using the Kruskal-Wallis test. The overall incidence was 21.8% (173/794), with 38.5% of farms with incidences higher to 40%. The seroconversion rate in cows with 1-2 parities (23.5%) was different than those with 6 or more parities (p=0.03). Holstein x Jersey cows had the highest incidence (33.3%), followed by Holstein (27.1%). According to the farmers, in the 26 farms (100%) they used an individual needle and a ingle rectal palpation glove per animal; however, 53.8% of farms showed incidences above 15%. In general, there was a tendency to lower CI in seronegative cows with regard to seropositives and seroconverters, especially in seropoisitives of 1-2 lactations (p=0.017) and 3-5 lactations (p=0.038). Regardless parity number or race, the seropositives and seroconverters required more SPC (p=0.031); this same tendency (not significant) was observed in DO. Thus, it was found some relation of the status about EBLV with CI and SPC, but not with DO, although there was no statistical significance in some of the differences found, with better parameters in seronegative cows.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Virus]]></kwd>
<kwd lng="es"><![CDATA[reproducción]]></kwd>
<kwd lng="es"><![CDATA[lechería]]></kwd>
<kwd lng="es"><![CDATA[sistema de información]]></kwd>
<kwd lng="es"><![CDATA[trópico]]></kwd>
<kwd lng="en"><![CDATA[Virus]]></kwd>
<kwd lng="en"><![CDATA[reproduction]]></kwd>
<kwd lng="en"><![CDATA[dairy]]></kwd>
<kwd lng="en"><![CDATA[information system]]></kwd>
<kwd lng="en"><![CDATA[tropics]]></kwd>
</kwd-group>
</article-meta>
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