<?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>S2730-50662024000201306</article-id>
<article-id pub-id-type="doi">10.31285/agro.28.1217</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Management of dairy heifers in Uruguay: Effects of feeding level and social environment on prepubertal development]]></article-title>
<article-title xml:lang="es"><![CDATA[Manejo de vaquillonas lecheras en Uruguay: Efectos del nivel de alimentación y el ambiente social sobre el desarrollo prepuberal]]></article-title>
<article-title xml:lang="pt"><![CDATA[Manejo de novilhas leiteiras no Uruguai: Efeitos no nível de alimentação e do am-biente social no desenvolvimento pré-puberal]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fiol]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la República Facultad de Veterinaria Departamento de Producción Animal y Salud de los Sistemas Productivos]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigación Agropecuaria (INIA) Sistema Lechero Semillero]]></institution>
<addr-line><![CDATA[ Colonia]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>28</volume>
<numero>nspe1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2730-50662024000201306&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2730-50662024000201306&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2730-50662024000201306&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Management practices during the rearing of dairy heifers should allow an adequate body growth and reproductive development to attain puberty several months before the first conception. Proposed target age and body weight (BW) at first calving for Holstein heifers are between 22-24 months and 82% of mature BW, respectively, for which heifers must conceive at around 15 months of age with 60% of their mature BW. Pre- and postweaning feeding level has effects on feed efficiency, behavior, energy metabolism and body and reproductive development, while social environment during rearing, specifically the social dominance and social regroupings, is known to affect energy metabolism, feeding behavior and body and reproductive development of the heifer. In Uruguay, the information published regarding the management of the dairy heifer is scarce. The aim of this review is to briefly assess the main factors affecting the onset of puberty, and to present an integrative approach of the information generated in Uruguay regarding the effects of modifying the feeding level and social environment during the rearing period on body development, metabolism, and onset of puberty in dairy heifers. In addition, we make a proposal of knowledge gaps that should be addressed in future studies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Las prácticas de manejo durante la crianza de las vaquillonas lecheras deben permitir un adecuado crecimiento cor-poral y un desarrollo reproductivo para alcanzar la pubertad varios meses antes de la primera concepción. La edad y el peso vivo (PV) objetivos al primer parto para las vaquillonas Holstein son entre 22 y 24 meses y con 82% de su PVadulto, respectivamente, por lo que deberían concebir alrededor de los 15 meses de edad con 60% de su PV adul-to. El nivel de alimentación antes y después del desleche tiene efectos sobre la eficiencia alimenticia, el comporta-miento, el metabolismo energético y el desarrollo corporal y reproductivo, mientras que el entorno social durante la crianza, específicamente la dominancia y los reagrupamientos sociales, afecta el metabolismo energético, el compor-tamiento alimentario y el desarrollo corporal y reproductivo de las vaquillonas. En Uruguay la información publicada respecto al manejo de la vaquillona lechera es escasa. El objetivo de esta revisión es analizar brevemente los princi-pales factores que inciden en el inicio de la pubertad, y presentar un enfoque integrador de la información generada en Uruguay sobre los efectos de modificar el nivel de alimentación y el entorno social durante la crianza sobre el desarrollo corporal, el metabolismo y el inicio de la pubertad en vaquillonas lecheras. Además, hacemos una pro-puesta de áreas del conocimiento que deberían ser abordadas en futuros estudios.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo: As práticas de manejo durante a recria de novilhas leiteiras devem permitir um adequado crescimento corporal e de-senvolvimento reprodutivo para atingir a puberdade vários meses antes da primeira concepção. A idade proposta e o peso corporal (PC) ao primeiro parto para novilhas Holstein estão entre 22-24 meses e 82% de seu PC adulto, res-pectivamente, para o qual as novilhas devem conceber por volta dos 15 meses de idade com 60% de seu PC adulto. O nível de alimentação pré e pós-desleite tem efeitos sobre a eficiência alimentar, comportamento, metabolismo energético e desenvolvimento corporal e reprodutivo, enquanto o ambiente social durante a recria, especificamente a dominância social e os reagrupamentos sociais, são conhecidos por afetar o metabolismo energético, comportamento alimentar e corpo e desenvolvimento reprodutivo da novilha. No Uruguai, as informações publicadas sobre o manejo da novilha leiteira são escassas. O objetivo desta revisão é revisar brevemente os principais fatores que afetam o início da puberdade e apresentar uma abordagem integrativa da informação gerada no Uruguai sobre os efeitos da modificação do nível alimentar e do ambiente social durante o período de criação no desenvolvimento corporal, meta-bolismo, e início da pubertade em novilhas leiteiras. Além disso, fazemos uma proposta de lacunas de conhecimento que devem ser abordadas em estudos futuros.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[puberty]]></kwd>
<kwd lng="en"><![CDATA[hypothalamic-pituitary-ovarian axis]]></kwd>
<kwd lng="en"><![CDATA[bodyweight gain]]></kwd>
<kwd lng="en"><![CDATA[competence]]></kwd>
<kwd lng="en"><![CDATA[social regrouping]]></kwd>
<kwd lng="es"><![CDATA[pubertad]]></kwd>
<kwd lng="es"><![CDATA[eje hipotálamo-hipófisis-ovario]]></kwd>
<kwd lng="es"><![CDATA[ganancia de peso]]></kwd>
<kwd lng="es"><![CDATA[competencia]]></kwd>
<kwd lng="es"><![CDATA[reagrupamiento social]]></kwd>
<kwd lng="pt"><![CDATA[pubertad]]></kwd>
<kwd lng="pt"><![CDATA[eixo hipotalâmico-hipofisário-ovariano]]></kwd>
<kwd lng="pt"><![CDATA[ganho de peso]]></kwd>
<kwd lng="pt"><![CDATA[competência]]></kwd>
<kwd lng="pt"><![CDATA[reagrupamento social]]></kwd>
</kwd-group>
</article-meta>
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