<?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>0120-2812</journal-id>
<journal-title><![CDATA[Acta Agronómica]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Agron.]]></abbrev-journal-title>
<issn>0120-2812</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-28122019000300205</article-id>
<article-id pub-id-type="doi">10.15446/acag.v68n3.66190</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Economic evaluation of puberty induction of nulliparian Nellore heifers using intravaginal device and melengestrol acetate]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación económica de la inducción de la pubertad de novillas nulíparas de la raza Nellore con el uso de dispositivo intravaginal y acetato de melengestrol]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pereira]]></surname>
<given-names><![CDATA[Luiz Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Souza Ferreira]]></surname>
<given-names><![CDATA[Renan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fujii Gongalves]]></surname>
<given-names><![CDATA[Rony]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vinhas Ítavo]]></surname>
<given-names><![CDATA[Luís Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Signor Kohl]]></surname>
<given-names><![CDATA[Endyara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Menezes Dias]]></surname>
<given-names><![CDATA[Alexandre]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barbosa Ferreira]]></surname>
<given-names><![CDATA[Marcos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espínala Carvalho]]></surname>
<given-names><![CDATA[Cristiano Marcelo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gongalves Mateus]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Católica Dom Bosco  ]]></institution>
<addr-line><![CDATA[Campo Grande ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Anhanguera  ]]></institution>
<addr-line><![CDATA[Campo Grande ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade Federal Mato Grosso do Sul  ]]></institution>
<addr-line><![CDATA[Campo Grande ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Católica Dom Bosco Laboratório de Biotecnologia Aplicada a Produgáo Animal ]]></institution>
<addr-line><![CDATA[Campo Grande ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<volume>68</volume>
<numero>3</numero>
<fpage>205</fpage>
<lpage>212</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122019000300205&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122019000300205&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122019000300205&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The present study evaluates the economic viability of puberty induction in nulliparous Bos taurus indicus Nellore breed heifers using an intravaginal device of fourth-use and melengestrol acetate (MGA®). The experiment was undertaken in the Nossa Senhora Aparecida Farm, Terenos city, Mato Grosso do Sul, Brazil, and was utilized a completely randomized experimental design in a 2 x 3 factorial scheme. Two age classes were included in the study, which were divided into 348 precocious (early-cycle) heifers, aging 16-18 months, weighting an average of 264.6 kg and 543 conventional-cycle heifers aging 24-26 months averaging 346.8 kg. The three treatments were as follows: control without the induction of follicle formation (treatment 1); treatment 2: induction with an intravaginal implant (intravaginal implantation with a fourth-use progesterone implant on Day 0, withdrawal on Day 12, and application of 1 ml of intramuscular estradiol cypionate [ECP®]); and treatment 3, 2.3 g of MGA® during 12 days with supplement followed by 1 ml of intramuscular ECP® at the end of the treatment. Heifers induced via implantation had a higher rate of ovarian activity (presence of corpus luteum) during the early cycle (63.8% animals) while the conventional cycle (72.4%). This effect influenced the frequency of early stage anestrus (56%). Among the treatments evaluated, 72% of control heifers had no ovarian activity (absence of corpus luteum). In the group with implant induction the conception rates were 65.5% and 62.4% in early and conventional-cycle females, respectively. Puberty induction in Nellore heifers provides a high economic return. The protocol revealed highest efficiency compared to the control group.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En el estudio se evalúo la viabilidad económica de la inducción de la pubertad en novillas Nellore nulíparas Bos taurus indicus utilizando un dispositivo intravaginal de cuarto uso y acetato de melengestrol (MGA®). El experimento se realizó en la Hacienda Nossa Senhora Aparecida, ciudad de Terenos, Mato Grosso do Sul, Brasil, y se utilizó un diseño experimental completamente al azar en un esquema factorial de 2 x 3. Se incluyeron animales en dos grupos de desarrollo: novillas precoces (ciclo temprano), con edades entre los 16 y los 18 meses, con un promedio de 264,6 kg; y 543 novillas de ciclo convencional con edades entre 24 y 26 meses y un promedio de peso vivo de 346,8 kg. Los tratamientos fueron: control sin la inducción de formación de folículos (tratamiento-1); tratamiento-2 consistente en inducción con un implante intravaginal (implante de progesterona de cuarto uso) en el día 0, retiro el día 12 y aplicación de 1 ml de cipionato de estradiol intramuscular [ECP®]; y tratamiento-3 consistente en 2,3 g de MGA® durante 12 días con suplemento seguido de 1 ml de ECP® intramuscular al final del tratamiento. Las novillas inducidas a través de la implantación tuvieron una mayor tasa de actividad ovárica (presencia de cuerpo lúteo) durante el ciclo temprano (63.8% animales) y en el ciclo convencional (72.4%). Este efecto influyó en la frecuencia de los estadios en etapa temprana (56%). Entre los tratamientos evaluados, el 72% de las novillas de control no presentaban actividad ovárica (ausencia de cuerpo lúteo). En el grupo con inducción de implantes, las tasas de concepción fueron de 65.5% y 62.4% en novillas de ciclo temprano y convencional, respectivamente. La inducción a la pubertad en novillas Nellore proporciona un alto rendimiento económico. El protocolo reveló una mayor eficiencia de este tratamiento en comparación con el grupo control.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Estrus induction]]></kwd>
<kwd lng="en"><![CDATA[fertility]]></kwd>
<kwd lng="en"><![CDATA[reproductive efficiency]]></kwd>
<kwd lng="en"><![CDATA[economic return]]></kwd>
<kwd lng="en"><![CDATA[pregnancy rate]]></kwd>
<kwd lng="es"><![CDATA[Inducción del estro]]></kwd>
<kwd lng="es"><![CDATA[fertilidad]]></kwd>
<kwd lng="es"><![CDATA[eficiencia reproductiva]]></kwd>
<kwd lng="es"><![CDATA[retorno económico]]></kwd>
<kwd lng="es"><![CDATA[tasa de preñez]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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