<?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>S2079-34802020000400493</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Economic evaluation of productive and reproductive indicators in dairy cows with different ages at first calving, in grazing systems]]></article-title>
<article-title xml:lang="es"><![CDATA[Valoración económica de indicadores productivos y reproductivos en vacas lecheras con diferentes edades al primer parto, en sistemas basados en pastoreo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Biga]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Di Masso]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marini]]></surname>
<given-names><![CDATA[P.R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Rosario Facultad de Ciencias Veterinarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro Latinoamericano de Estudios de Problemáticas Lecheras (CLEPL)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af3">
<institution><![CDATA[,Carrera del Investigador Científico (CIC-UNR)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>54</volume>
<numero>4</numero>
<fpage>493</fpage>
<lpage>501</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2079-34802020000400493&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2079-34802020000400493&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2079-34802020000400493&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In livestock activity, profitability can be evaluated by calculating zootechnical indices, because of their relation with production and, consequently, to the main income source for the farmer. The aim of this study was to evaluate the importance of a group of productive-reproductive indicators, not always valued, in the economic results of milk production in system based on grazing. Retrospective data was used, corresponding to lactations of 1,785 primiparous Holstein cows, American-Canadian biotype, collected between 1999-2016 in two establishments located in Entre Ríos province, Argentina. Fifty members from each of the following three age groups at first calving were randomly chosen: Group 1: 750 days (24 months), Group 2: 840 days (27 months) and Group 3: 1,098 days (32 months). Group characterization was based on values of the following indicators: total productive life, total milk production, milk index, productive days, number of calvings, production per lactation and mean calving interval. Significant differences between groups (p &lt;0.05) were only observed for total productive life. Although all three groups produced similar amounts of milk, cows in the late calving age group resulted in higher incomes. It is concluded that indicators calving interval, efficiency in rearing, age at first calving and longevity, all of which are easy to register, acquire relevance when evaluating their impact while modeling the final economic result of the establishment, thus enabling the technical and managerial decision making, aimed to improve system profitability.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La rentabilidad de la actividad ganadera se puede evaluar a partir del cálculo de índices zootécnicos, ya que están relacionados con la producción y, en consecuencia, con la principal fuente de ingresos para el productor. El objetivo del trabajo fue evaluar la importancia de un conjunto de indicadores productivo-reproductivos, no siempre valorados, en los resultados económicos de un sistema de producción de leche en pastoreo. Se utilizaron datos retrospectivos, correspondientes a las lactancias de 1785 vacas primíparas de raza Holstein, biotipo americano-canadiense, recolectados entre los años 1999-2016, en dos establecimientos ubicados en la provincia de Entre Ríos, Argentina. Se eligieron al azar 50 integrantes de cada uno de los siguientes tres grupos de edad al primer parto: grupo I) 750 días (24 meses), grupo II) 840 días (27 meses) y grupo III) 1098 días (32 meses). Se les caracterizó en función de los valores correspondientes a los indicadores vida productiva total, producción total de leche, índice de leche, días productivos, número de partos, producción por lactancia e intervalo parto-parto promedio. Solo se observaron diferencias significativas entre grupos (P&lt; 0,05) para vida productiva total. A pesar de que los tres grupos produjeron similar cantidad de leche, las vacas del grupo con edad al parto tardía generaron mayores ingresos. Se concluye que los indicadores intervalo parto-parto, eficiencia en la cría y recría, edad al primer parto y longevidad, todos de fácil registro, adquieren relevancia al evaluar su impacto, cuando se modela el resultado económico final del establecimiento, lo que posibilita la toma de decisiones técnicas y gerenciales, dirigidas a mejorar la rentabilidad del sistema.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[dairy cows]]></kwd>
<kwd lng="en"><![CDATA[age at first calving]]></kwd>
<kwd lng="en"><![CDATA[calving interval]]></kwd>
<kwd lng="en"><![CDATA[longevity]]></kwd>
<kwd lng="es"><![CDATA[vacas lecheras]]></kwd>
<kwd lng="es"><![CDATA[edad al primer parto]]></kwd>
<kwd lng="es"><![CDATA[intervalo parto-parto]]></kwd>
<kwd lng="es"><![CDATA[longevidad]]></kwd>
</kwd-group>
</article-meta>
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