<?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>0873-3015</journal-id>
<journal-title><![CDATA[Millenium - Journal of Education, Technologies, and Health]]></journal-title>
<abbrev-journal-title><![CDATA[Mill]]></abbrev-journal-title>
<issn>0873-3015</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico de Viseu (IPV)]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0873-30152020000300023</article-id>
<article-id pub-id-type="doi">10.29352/mill0213.02.00296</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Fixed-time artificial insemination in extensive cattle.]]></article-title>
<article-title xml:lang="pt"><![CDATA[Inseminação artificial a tempo fixo em bovinos explorados em sistema extensivo.]]></article-title>
<article-title xml:lang="es"><![CDATA[Inseminación artificial de tiempo fijo en ganado extensivo.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dias]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvalho]]></surname>
<given-names><![CDATA[Joaquim]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodrigues]]></surname>
<given-names><![CDATA[João Várzea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martins]]></surname>
<given-names><![CDATA[Manuel Vicente]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Polytechnic Institute of Castelo Branco School of Agriculture ]]></institution>
<addr-line><![CDATA[Castelo Branco ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Beira Interior Health Sciences Research Centre ]]></institution>
<addr-line><![CDATA[Covilhã ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Polytechnic Institute of Castelo Branco Quality of Life Research Unit in the Rural World ]]></institution>
<addr-line><![CDATA[Castelo Branco ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>12</month>
<year>2020</year>
</pub-date>
<numero>13</numero>
<fpage>23</fpage>
<lpage>28</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0873-30152020000300023&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0873-30152020000300023&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0873-30152020000300023&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: Fixed-time artificial insemination (TAI) is a useful tool in explorations to improve productivity, if ovulation synchronization requirements are met, related to the physical status of females and their reproductive apparatus. The protocol used allows greater success in cases of anestro, inducing cyclicity in cows or non-cyclic heifers, allowing AI at a predetermined time, dispensing with heat detection, in meat cattle in extensive system.  Objetives: Improve reproductive performance in beef cattle. Artificial insemination (AI) is an important reproductive technique for the genetic improvement of production animals, as well as a strategy for synchronizing the time of childbirth in a region with periods of food shortage, in quantity and quality.  Methods:  Exploratory study with quantitative approach. The work carried out between March 2018 and April 2019 where 220 AI were carried out in 8 staff from the Centro and Alentejo region of different genetic bases, diagnosed with pregnancy at 40 days.  Results:  The gestation rate (%G) for the two years was 55.5% in 2018 (n=178) was 52.8% and 66.7% (n=42) in 2019.  Conclusions:  The results obtained allow predicting 55% of TG, however an assessment of risk factors involved (climate, feeding, body condition, management) may contribute to an improvement in results.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Introdução:  A inseminação artificial a tempo fixo (IATF) é uma ferramenta útil nas explorações para melhorar a produtividade, desde que sejam cumpridos os requisitos de sincronização de ovulação, relacionados com o exame físico das fêmeas e do seu aparelho reprodutor. O protocolo utilizado permite maior sucesso em casos de anestro, induzindo a ciclicidade em vacas ou novilhas, permitindo a IA num momento pré-determinado, prescindindo da deteção do cio, em efetivos de bovinos de carne explorados em sistema extensivo.  Objetivos: Melhorar a performance reprodutiva em bovinos de carne. A inseminação artificial (IA) é uma técnica reprodutiva importante para o melhoramento genético de animais de produção, bem como estratégia de sincronização de época de partos numa região com períodos de escassez alimentar, em quantidade e qualidade.  Métodos:  Estudo exploratório com abordagem quantitativa. O trabalho realizado entre março de 2018 e abril de 2019 onde foram efetuadas 220 IA em 8 efetivos da região Centro e Alentejo de diferentes bases genéticas, com diagnóstico de gestação aos 40 dias.  Resultados:  A taxa de gestação (TG) para os dois anos foi de 55,5%, em 2018 (n=178) foi 52,8% e de 66,7% (n=42) em 2019.  Conclusões:  Os resultados obtidos permitem prever 55% de TG, contudo uma avaliação de fatores de risco envolvidos (clima, alimentação, condição corporal, maneio) poderão contribuir para uma melhoria dos resultados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  La inseminación artificial a tiempo fijo (IATF) es una herramienta útil en la exploración para mejorar la productividad, siempre que se cumplan los requisitos de sincronización de la ovulación, relacionados con el estado físico de las hembras y sus aparatos reproductivos. El protocolo utilizado permite un mayor éxito en los casos de anestro, induciendo la ciclicidad en vacas o vaquillas no cíclicas, permitiendo la IA en un momento predeterminado, dispensando con detección de calor, en ganado de carne en un sistema extensivo.  Objetivos:  Mejorar el rendimiento reproductivo en el ganado vacuno. La inseminación artificial (IA) es una técnica reproductiva importante para la mejora genética de los animales de producción, así como una estrategia para sincronizar el tiempo de entrega en una región con períodos de escasez de alimentos, en cantidad y calidad.  Métodos:  Estudio exploratorio con enfoque cuantitativo. El trabajo realizado entre marzo de 2018 y abril de 2019, donde se realizaron 220 IA en 8 empleados de la región Centro y Alentejo de diferentes bases genéticas, diagnosticados con embarazo a los 40 días.  Resultados:  La tasa de gestación (TG) para los dos años fue del 55,5%, en 2018 (n-178) fue del 52,8% y del 66,7% (n-42) en 2019.  Conclusiones:  Los resultados obtenidos permiten predecir el 55% de TG, sin embargo, una evaluación de los factores de riesgo involucrados (clima, alimentación, condición corporal, manejo) puede contribuir a una mejora en los resultados.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[cattle]]></kwd>
<kwd lng="en"><![CDATA[fixed-time artificial insemination]]></kwd>
<kwd lng="en"><![CDATA[extensive production systems]]></kwd>
<kwd lng="en"><![CDATA[gestation rate]]></kwd>
<kwd lng="pt"><![CDATA[bovinos]]></kwd>
<kwd lng="pt"><![CDATA[inseminação artificial a tempo fixo]]></kwd>
<kwd lng="pt"><![CDATA[sistemas extensivos de produção]]></kwd>
<kwd lng="pt"><![CDATA[taxa de gestação]]></kwd>
<kwd lng="es"><![CDATA[ganado]]></kwd>
<kwd lng="es"><![CDATA[inseminación artificial a tiempo fijo]]></kwd>
<kwd lng="es"><![CDATA[extensivos sistemas de producción]]></kwd>
<kwd lng="es"><![CDATA[tasa de embarazo]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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