Ovarian superstimulatory response and embryo production in mares treated with equine pituitary extract twice daily

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dc.contributor.authorAlvarenga, Marco Antonio [UNESP]
dc.contributor.authorMcCue, P. M.
dc.contributor.authorBruemmer, J.
dc.contributor.authorNeto, JRN
dc.contributor.authorSquires, E. L.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionColorado State Univ
dc.date.accessioned2014-02-26T17:12:15Z
dc.date.accessioned2014-05-20T13:41:45Z
dc.date.available2014-02-26T17:12:15Z
dc.date.available2014-05-20T13:41:45Z
dc.date.issued2001-09-15
dc.description.abstractEquine pituitary extract (EPE), has been reported to induce multiple ovulation in mares, however ovulation rates are poor in comparison to those obtained in other species. Attempts to improve the effectiveness of EPE for induction of superovulation in cyclic mares has focused on daily frequency of EPE treatment. Two experiments were performed to compare the ovarian response of cyclic mares given EPE once or twice-daily. Mares were assigned to one of two treatment groups 6 to 8 days after ovulation: prostaglandin was given once and EPE (25 mg) was given once daily (Group 1) or twice daily (Group 2). In Experiment 1, more (P < 0.05) follicles <greater than or equal to>35 mm were detected in mares treated with EPE twice daily (6.1 +/- 3.1) than in mares treated once a daily (2.0 +/- 0.6). In a second experiment, the embryo recovery rates of mares given the two EPE protocols used in Experiment 1 were compared. The number of ovulations per mare was higher (P < 0.05) for mares treated twice-daily (7.1 +/- 5.1, range 3 to 18) than for mares treated once daily (2.4 +/- 1.8, range 1 to 6). The number of embryos produced per mare was higher (P < 0.05) in mares in Group 2 (3.5) than in Group 1 (1.6).Although it is not clear whether the increased ovulation rate is due specifically to dose or frequency, twice-daily administration of a high dose of EPE significantly improved follicular development, ovulation and embryo recovery over the standard treatment of once-daily injection. (C) 2001 by Elsevier B.V.en
dc.description.affiliationUNESP, Sch Vet Med & Anim Sci, Dept Anim Reprod & Vet Radiol, BR-18618 Botucatu, SP, Brazil
dc.description.affiliationColorado State Univ, Anim Reprod & Biotechnol Lab, Ft Collins, CO 80523 USA
dc.description.affiliationUnespUNESP, Sch Vet Med & Anim Sci, Dept Anim Reprod & Vet Radiol, BR-18618 Botucatu, SP, Brazil
dc.format.extent879-887
dc.identifierhttp://dx.doi.org/10.1016/S0093-691X(01)00615-X
dc.identifier.citationTheriogenology. New York: Elsevier B.V., v. 56, n. 5, p. 879-887, 2001.
dc.identifier.doi10.1016/S0093-691X(01)00615-X
dc.identifier.issn0093-691X
dc.identifier.lattes0473846154288947
dc.identifier.urihttp://hdl.handle.net/11449/14494
dc.identifier.wosWOS:000171452200016
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofTheriogenology
dc.relation.ispartofjcr2.136
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectsuperovulationpt
dc.subjectmarept
dc.subjectequine pituitary extractpt
dc.subjectembryo recoverypt
dc.titleOvarian superstimulatory response and embryo production in mares treated with equine pituitary extract twice dailyen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes0473846154288947
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Medicina Veterinária e Zootecnia, Botucatupt

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