Ovulation synchronization following commercial application of ultrasound-guided follicle ablation during the estrous cycle in mares

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dc.contributor.authorBergfelt, D. R.
dc.contributor.authorMeira, Cezinande de [UNESP]
dc.contributor.authorFleury, J. J.
dc.contributor.authorFleury, P. D. C.
dc.contributor.authorDell'aqua Junior, José Antônio [UNESP]
dc.contributor.authorAdams, G. P.
dc.contributor.institutionUniv Wisconsin
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionFMVOB
dc.contributor.institutionUniv Saskatchewan
dc.date.accessioned2014-05-20T15:26:06Z
dc.date.available2014-05-20T15:26:06Z
dc.date.issued2007-11-01
dc.description.abstractA regimen of progesterone plus estradiol (P&E) was used as a standard for ovarian synchronization to test the efficacy and evaluate the commercial application of ultrasound-guided follicle ablation as a non-steroidal alternative for ovulation synchronization in mares. Recipient mares at a private embryo transfer facility were at unknown stages of the estrous cycle at the start of the experiment on Day 1 when they were randomly assigned to an ablation group (n = 18-21 mares) or to a ME group (n = 20-21 mares). In the ablation group, mares were lightly sedated and all follicles > 10 mm were removed by transvaginal ultrasound-guided follicle aspiration. In the ME group, a combination of progesterone (150 mg) plus estradiol (10 mg) prepared in safflower oil was given daily (im) for 10 d. Two doses of prostaglandin FZ, (PGF, 10 mg/dose, im) were given 12 h apart on Day 5 in the ablation group, or a single dose on Day 10 in the ME group. Human chorionic gonadotropin (hCG, 2500 IU/mare, im) was given at a fixed time, 6 and 10 d after PGF treatment in the ablation and ME groups, respectively, with the expectation of a follicle > 30 mm at the time of treatment. In both the ablation and P&E groups, transrectal ultrasonography was done at the start of the study (Day 1) and again on the day of hCG treatment and daily thereafter to determine the presence of a CL, measure diameter of the largest follicle and detect ovulation. The mean interval from the start of the study and from PGF treatment to ovulation was shorter (P < 0.0001) in the ablation group (13.7 and 9.7 d, respectively) compared to the P&E group (22.3 and 13.2 d, respectively). Following fixed-day treatment with hCG after PGF treatment, the degree of ovulation synchronization was not different (P > 0.05) between the ablation and P&E groups within a 2-d (56 and 70%) or 4-d (83% and 90%) period. Although ultrasound-guided follicle ablation may not be practical in all circumstances, it excluded the conventional 10-d regimen of progesterone and estradiol and was considered an efficacious and feasible, non-steroidal alternative for ovulation synchronization in mares during the estrous cycle. (C 2007 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Wisconsin, Dept Anim Hlth & Biomed Sci, Madison, WI 53706 USA
dc.description.affiliationFMVZ UNESP, São Paulo, Brazil
dc.description.affiliationFMVOB, São Paulo, Brazil
dc.description.affiliationUniv Saskatchewan, Dept Vet Biomed Sci, Saskatoon, SK S7N 5B4, Canada
dc.description.affiliationUnespFMVZ UNESP, São Paulo, Brazil
dc.format.extent1183-1191
dc.identifierhttp://dx.doi.org/10.1016/j.theriogenology.2007.08.020
dc.identifier.citationTheriogenology. New York: Elsevier B.V., v. 68, n. 8, p. 1183-1191, 2007.
dc.identifier.doi10.1016/j.theriogenology.2007.08.020
dc.identifier.issn0093-691X
dc.identifier.lattes0042905415711199
dc.identifier.orcid0000-0002-2245-800X
dc.identifier.urihttp://hdl.handle.net/11449/36336
dc.identifier.wosWOS:000250244100013
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofTheriogenology
dc.relation.ispartofjcr2.136
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectfollicle ablationpt
dc.subjectprogesterone plus estradiolpt
dc.subjectovulation synchronizationpt
dc.subjectmarept
dc.titleOvulation synchronization following commercial application of ultrasound-guided follicle ablation during the estrous cycle in maresen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes0042905415711199[2]
unesp.author.orcid0000-0001-8758-3605[5]
unesp.author.orcid0000-0002-2245-800X[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Medicina Veterinária e Zootecnia, Botucatupt

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