Diferenças sazonais no padrão endócrino e ovariano do ciclo estral de novilhas bos taurus indicus (Nelore)

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dc.contributor.authorCorte Junior, Anivaldo Olivio [UNESP]
dc.contributor.authorNavarrete, Bruno José Ferreira [UNESP]
dc.contributor.authorNogueira, Guilherme de Paula [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:27:24Z
dc.date.available2014-05-27T11:27:24Z
dc.date.issued2012-12-01
dc.description.abstractEstrous cycle of eight Nelore heifers were evaluated during different seasons of the year (autumn n=11; winter n=8; spring n=9 and summer n=9) with daily count and measurement of follicles ≥3mm, blood was collected every 12h for LH and progesterone (P4), and after estrous every 3h for LH peak. Five ovariectomized heifers were injected with 17β-estradiol (2μg/kg) every season and blood samples collected every 3h (for 30h) thereafter for LH quantification. The monthly percent body weight difference (Δ%) did not vary among seasons. P4 concentration was higher (p<0.01) and follicle number lower during autumn and summer compared to winter and spring. During winter there were more estrous cycles with three and during summer only cycles with two follicular waves (p<0.01). As LH secretion did not vary despite P4 concentration and as there was negative correlation between higher P4 values and daily percentile variation of photoperiod (Δ%, p<0.01; r= -0.45) it is possible to suppose that there is seasonal variation on luteal cell sensitivity to LH. In the ovariectomized Nelore heifers, the LH basal concentration (without estradiol stimulus, p=0.02) and the LH response to estradiol (p<0.01) were lower during summer, leading to the hypothesis that there is seasonal variation of hypothalamic sensitivity to estradiol. According to the present experiment there are suggestions of seasonal reproduction in Nelore heifers.en
dc.description.affiliationCurso de Medicina Veterinária Universidade Estadual Paulista Júlio de Mesquita Filho, Araçatuba-SP
dc.description.affiliationUnespCurso de Medicina Veterinária Universidade Estadual Paulista Júlio de Mesquita Filho, Araçatuba-SP
dc.format.extent46-56
dc.identifierhttp://www.revistas.usp.br/bjvras/article/view/40172
dc.identifier.citationBrazilian Journal of Veterinary Research and Animal Science, v. 49, n. 1, p. 46-56, 2012.
dc.identifier.file2-s2.0-84872586888.pdf
dc.identifier.issn1413-9596
dc.identifier.issn1678-4456
dc.identifier.lattes6926188473133379
dc.identifier.scopus2-s2.0-84872586888
dc.identifier.urihttp://hdl.handle.net/11449/74010
dc.language.isoeng
dc.language.isopor
dc.relation.ispartofBrazilian Journal of Veterinary Research and Animal Science
dc.relation.ispartofsjr0,225
dc.relation.ispartofsjr0,225
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectSeasonal. estradiol. luteinizing hormone. ovarian follicle. progesterone
dc.subjectBos indicus
dc.subjectBos taurus
dc.titleDiferenças sazonais no padrão endócrino e ovariano do ciclo estral de novilhas bos taurus indicus (Nelore)pt
dc.title.alternativeSeasonal differences in endocrine and ovarian patterns of bos taurus indicus (Nelore) heifers estrous cyclesen
dc.typeArtigo
dcterms.licensehttp://www.scielo.br/revistas/bjvras/paboutj.htm
unesp.author.lattes6926188473133379
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Medicina Veterinária, Araçatubapt

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