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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/39040
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dc.contributor.authorSchmitt, EJP-
dc.contributor.authorDiaz, T.-
dc.contributor.authorBarros, C. M.-
dc.contributor.authordelaSota, R. L.-
dc.contributor.authorDrost, M.-
dc.contributor.authorFredriksson, E. W.-
dc.contributor.authorStaples, C. R.-
dc.contributor.authorThorner, R.-
dc.contributor.authorThatcher, W. W.-
dc.date.accessioned2014-05-20T15:29:26Z-
dc.date.accessioned2016-10-25T18:04:43Z-
dc.date.available2014-05-20T15:29:26Z-
dc.date.available2016-10-25T18:04:43Z-
dc.date.issued1996-05-01-
dc.identifierhttp://www.animal-science.org/content/74/5/1074.short-
dc.identifier.citationJournal of Animal Science. Savoy: Amer Soc Animal Science, v. 74, n. 5, p. 1074-1083, 1996.-
dc.identifier.issn0021-8812-
dc.identifier.urihttp://hdl.handle.net/11449/39040-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/39040-
dc.description.abstractA series of experiments with Holstein heifers was conducted to develop the capability of inducing accessory corpus luteum (CL) with a GnRH agonist (Buserelin, 8 mu g; GnRHa) or hCG; (3,000 IU) to increase plasma progesterone concentrations (Exp. 1, 2, and 3) and to test whether induction of accessory CL with hCG will increase conception rates in heifers (Exp. 4) and lactating cows (Exp. 5). In Exp. 1, heifers were treated on d 5 after estrus with GnRHa (n = 8) or saline (n = 7); heifers in Exp. 2 received hCG (n = 5) or saline (n = 4) on d 5. Experiment 3 allowed a contemporary evaluation of heifers treated on d 5 with GnRHa (n = 6), hCG (n = 6), saline (n = 6), or GnRHa at d 5 and hCG at the time of the induced ovulation (n = 5). The GnRHa and hCG were equally effective in inducing an accessory CL (93% induction rate), but the subsequent increase in progesterone concentrations was greater in hCG-treated heifers. A greater half life of hCG may provide longer LH-like stimulation of the first-wave follicle and subsequent developing accessory CL or a greater luteotropic effect on the original CL. Induction of an accessory CL with hCG on d 5 or 6 after insemination did not increase pregnancy rates in fertile heifers (Exp. 4: hCG = 64.8% vs control = 62.9%; n = 243) or lactating dairy cows during summer heat stress (Exp. 5: hCG = 24.2% vs control = 23.5%; n = 201).en
dc.format.extent1074-1083-
dc.language.isoeng-
dc.publisherAmer Soc Animal Science-
dc.sourceWeb of Science-
dc.subjecthCGpt
dc.subjectGnRH agonistpt
dc.subjectcorpus luteumpt
dc.subjectfolliclespt
dc.subjectprogesteronept
dc.subjectfertilitypt
dc.titleDifferential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormoneen
dc.typeoutro-
dc.contributor.institutionUNIV FLORIDA-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionS FLORIDA CTR FERTIL-
dc.description.affiliationUNIV FLORIDA,DEPT DAIRY & POULTRY SCI,GAINESVILLE,FL 32611-
dc.description.affiliationUNIV FLORIDA,DEPT LARGE ANIM CLIN SCI,GAINESVILLE,FL 32611-
dc.description.affiliationUNESP,DEPT PHARMACOL,BR-18600 SAO PAULO,BRAZIL-
dc.description.affiliationS FLORIDA CTR FERTIL,MIAMI,FL 33143-
dc.description.affiliationUnespUNESP,DEPT PHARMACOL,BR-18600 SAO PAULO,BRAZIL-
dc.identifier.wosWOS:A1996UJ93100019-
dc.rights.accessRightsAcesso aberto-
dc.relation.ispartofJournal of Animal Science-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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