<?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>1659-4266</journal-id>
<journal-title><![CDATA[Cuadernos de Investigación UNED]]></journal-title>
<abbrev-journal-title><![CDATA[Cuadernos de Investigación UNED]]></abbrev-journal-title>
<issn>1659-4266</issn>
<publisher>
<publisher-name><![CDATA[Universidad Estatal a Distancia de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-42662018000200422</article-id>
<article-id pub-id-type="doi">10.22458/urj.v10i2.2171</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Producción y reproducción de vacas Holstein, Jersey y sus cruces en cinco localidades de Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Production and reproduction of cows; Holstein, Jersey and their crossbreed, in five locations of Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Blanco]]></surname>
<given-names><![CDATA[Jose Pablo Gonzáles]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[WingChing-Jones]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Zootecnia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Zootecnia Centro de Investigación en Nutrición Animal.]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>10</volume>
<numero>2</numero>
<fpage>422</fpage>
<lpage>427</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-42662018000200422&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-42662018000200422&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-42662018000200422&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En Costa Rica el 26% del ganado vacuno está destinado a la producción de leche especializada, predominando la raza Jersey, seguida de Holstein, Guersey y Pardo Suizo. Evaluamos 1 586 registros de animales en Heredia, Cartago, Coronado, San Carlos y Zarcero. Los sistemas se caracterizan por el uso del pastoreo rotacional en estrella africana (Cynodon nlemfuensis) o kikuyo (Kikuyuocloa clandestina), complemenando con subproductos agroindustriales, ensilajes; y alimento balanceado con un mínimo de 16% de proteína cruda y de 3 000kcal ED/kg. Utilizamos los registros actualizados para hacer una base de datos incluyendo días abiertos (DA), intervalo entre partos (IEP), días en lactancia y producción de leche diaria de Holstein, Jersey, y sus cruces en diferentes proporciones. Los parámetros reproductivos, IEP y días abiertos, fueron mayores en Holstein que en Jersey y F1 HxJ en 30,44 y 35,80; 20,29 y 25,86 días respectivamente. Diariamente, la Jersey produce 1,77 y 1,3kg menos leche que Holstein y F1 HxJ. No hubo diferencia en Holstein y F1 HxJ. El cruce de Holstein y Jersey es promisorio.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In Costa Rica 26% of the cattle is intented to the production of specialized milk, predominating the Jersey race, followed by Holstein, Guersey and Brown Swiss. We evaluated 1 586 animal records in Heredia, Cartago, Coronado, San Carlos and Zarcero. The systems are characterized by the use of rotational grazing in African star (Cynodon nlemfuensis) or Kikuyo (Kikuyuocloa clandestina), complementing with agroindustrial byproducts, silages; and balanced feed with a minimum of 16% crude protein and 3 000kcal ED / kg. We use the updated records to make a database including open days (DA), interval between births (IEP), days in lactation and daily milk production of Holstein, Jersey, and their crosses in different proportions. Reproductive parameters, IEP and open days were higher in Holstein than in Jersey and F1 HxJ in 30,44 and 35,80; 20,29 and 25,86 days respectively. Daily, Jersey produces 1,77 and 1,3kg less milk than Holstein and F1 HxJ. There was no difference in Holstein and F1 HxJ. The crossing of Holstein and Jersey is promising.]]></p></abstract>
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<kwd lng="es"><![CDATA[Producción de leche]]></kwd>
<kwd lng="es"><![CDATA[reproducción animal]]></kwd>
<kwd lng="es"><![CDATA[periodo abierto]]></kwd>
<kwd lng="es"><![CDATA[intervalo entre partos]]></kwd>
<kwd lng="es"><![CDATA[Bos taurus]]></kwd>
<kwd lng="en"><![CDATA[daily milk production]]></kwd>
<kwd lng="en"><![CDATA[animal reproduction]]></kwd>
<kwd lng="en"><![CDATA[open days]]></kwd>
<kwd lng="en"><![CDATA[calving interval]]></kwd>
<kwd lng="en"><![CDATA[Bos taurus]]></kwd>
</kwd-group>
</article-meta>
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