<?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>2730-5066</journal-id>
<journal-title><![CDATA[Agrociencia Uruguay]]></journal-title>
<abbrev-journal-title><![CDATA[Agrocienc. Urug.]]></abbrev-journal-title>
<issn>2730-5066</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Agronomía - Instituto de Nacional de Investigación Agropecuaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2730-50662021000101302</article-id>
<article-id pub-id-type="doi">10.31285/agro.25.99</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Season of the year, the feeding and productive environment: effect on the content of casein in milk]]></article-title>
<article-title xml:lang="es"><![CDATA[Estación del año, alimentación y ambiente productivo: efecto sobre el contenido de caseína en leche]]></article-title>
<article-title xml:lang="pt"><![CDATA[Estação do ano, alimentação e ambiente produtivo: efeito sobre o teor de caseína no leite]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Colzada]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Bentancur]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Grille]]></surname>
<given-names><![CDATA[L.]]></given-names>
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<contrib contrib-type="author">
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<surname><![CDATA[Carro]]></surname>
<given-names><![CDATA[S.]]></given-names>
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<name>
<surname><![CDATA[Escobar]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Pelaggio]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Piedrabuena]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Rampoldi]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
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</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reinares]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
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</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chilibroste]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la República Facultad de Agronomía Departamento de Producción Animal y Pasturas]]></institution>
<addr-line><![CDATA[Paysandú ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de la República Facultad de Veterinaria Departamento de Ciencia y Tecnología de la Leche]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Laboratorio Tecnológico del Uruguay (LATU) Gerencia de Investigación, Desarrollo e Innovación Gerencia de análisis, Ensayos y Metodología]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,CRI Lechero del Litoral  ]]></institution>
<addr-line><![CDATA[Paysandú ]]></addr-line>
<country>Uruguay</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>25</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2730-50662021000101302&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2730-50662021000101302&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2730-50662021000101302&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: A study was carried out to determine the casein variation in milk along the year with season and herd feeding strategy as main source of variation. Monthly samples were taken from 30 dairy farms that sent milk to pili sa (15 farms) and claldy sa (15 farms) during April 2012 - March 2013. A mixed model and a recursive partition of variance method were used. The protein content in milk was higher in autumn, and the casein content in milk was higher in autumn and winter probably due to the higher use of energy concentrated supplements with better synchronization with the protein contribution from pastures. It was possible to maintain high levels of casein content and a casein:true protein ratio in milk during spring with almost exclusively pastoral diets. Overall, the proportion of casein in relation to the total protein and the casein in relation to true protein in milk did not reach the values reported in the literature with more concentrated diets.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se realizó un estudio con el objetivo de estudiar el patrón de variación de caseína en leche a lo largo del año, y la estrategia de alimentación del rodeo lechero como principal fuente de variación. Se tomaron muestras mensuales en tambos remitentes a las empresas pili sa y claldy sa (15 tambos por empresa) durante el período abril 2012 - marzo 2013. Se utilizó un modelo mixto y un método de partición recursiva de varianza. El contenido de proteína en leche fue mayor en otoño y el contenido de caseína en leche fue mayor en otoño e invierno, probablemente explicado por el mayor uso de suplementos concentrados que aportan energía con una mejor sincronización con el aporte de proteína por parte de las pasturas. Fue posible mantener niveles altos de contenido de caseína y relación caseína/proteína verdadera en leche en primavera, con dietas casi exclusivamente pastoriles. En general, la proporción de caseína en relación a la proteína total y la relación caseína/proteína verdadera en leche no alcanzó valores que reporta la bibliografía con dietas más concentradas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo: Foi realizado um estudo para determinar a variação da concentração de caseína no leite ao longo do ano com a estação do ano e a estratégia de alimentação do rebanho como principal fonte de variação. Amostras mensais foram retiradas de 30 fazendas leiteiras que enviaram o leite para pili sa (15 fazendas) e claldy sa (15 fazendas) durante o período de abril de 2012 a março de 2013. Um modelo misto e um método de partição de variância recursiva foram usados. O teor de proteína no leite foi maior no outono, e o teor de caseína no leite foi maior no outono e inverno provavelmente explicado pelo maior uso de suplementos concentrados de energia com melhor sincronização com a contribuição proteica das pastagens. Foi possível manter altos níveis de conteúdo de caseína e uma relação caseína / proteína verdadeira no leite durante a primavera com dietas quase exclusivamente pastorais. De maneira geral, a proporção de caseína em relação à proteína total e a caseína em relação à proteína verdadeira do leite não atingiram os valores relatados na literatura com dietas mais concentradas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[casein]]></kwd>
<kwd lng="en"><![CDATA[concentrated]]></kwd>
<kwd lng="en"><![CDATA[nutrition]]></kwd>
<kwd lng="en"><![CDATA[pastures]]></kwd>
<kwd lng="en"><![CDATA[production systems]]></kwd>
<kwd lng="es"><![CDATA[caseína]]></kwd>
<kwd lng="es"><![CDATA[concentrado]]></kwd>
<kwd lng="es"><![CDATA[nutrición]]></kwd>
<kwd lng="es"><![CDATA[pasturas]]></kwd>
<kwd lng="es"><![CDATA[sistemas de producción]]></kwd>
<kwd lng="pt"><![CDATA[caseína]]></kwd>
<kwd lng="pt"><![CDATA[concentrado]]></kwd>
<kwd lng="pt"><![CDATA[nutrição]]></kwd>
<kwd lng="pt"><![CDATA[pastagens]]></kwd>
<kwd lng="pt"><![CDATA[sistemas de produção]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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