Neither plasma progesterone concentrations nor exogenous eCG affects rates of ovulation or pregnancy in fixed-time artificial insemination (FTAI) protocols for puberal Nellore heifers

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dc.contributor.authorPegorer, M. Figueira
dc.contributor.authorEreno, R. L.
dc.contributor.authorSatrapa, R. A.
dc.contributor.authorPinheiro, V. G.
dc.contributor.authorTrinca, L. A.
dc.contributor.authorBarros, C. M.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:25:26Z
dc.date.available2014-05-27T11:25:26Z
dc.date.issued2011-01-01
dc.description.abstractThe objective was to evaluate the effects of plasma progesterone (P4) concentrations and exogenous eCG on ovulation and pregnancy rates of pubertal Nellore heifers in fixed-time artificial insemination (FTAI) protocols. In Experiment 1 (Exp. 1), on Day 0 (7 d after ovulation), heifers (n = 15) were given 2 mg of estradiol benzoate (EB) im and randomly allocated to receive: an intravaginal progesterone-releasing device containing 0.558 g of P4 (group 0.5G, n = 4); an intravaginal device containing 1 g of P4 (group 1G, n = 4); 0.558 g of P4 and PGF2α (PGF; 150 μg d-cloprostenol, group 0.5G/PGF, n = 4); or 1 g of P4 and PGF (group 1G/PGF, n = 3). On Day 8, PGF was given to all heifers and intravaginal devices removed; 24 h later (Day 9), all heifers were given 1 mg EB im. In Exp. 2, pubertal Nellore heifers (n = 292) were treated as in Exp. 1, with FTAI on Day 10 (30 to 36 h after EB). In Exp. 3, pubertal heifers (n = 459) received the treatments described for groups 0.5G/PGF and 1G/PGF and were also given 300 IU of eCG im (groups 0.5G/PGF/eCG and 1G/PGF/eCG) at device removal (Day 8). In Exp. 1, plasma P4 concentrations were significantly higher in heifers that received 1.0 vs 0.588 g P4, and were significantly lower in heifers that received PGF on Day 0. In Exp. 2 and 3, there were no significant differences among groups in rates of ovulation (65-77%) or pregnancy (Exp. 2: 26-33%; Exp. 3: 39-43%). In Exp. 3, diameter of the dominant ovarian follicle on Day 9 was larger in heifers given 0.558 g vs 1.0 g P4 (10.3 ± 0.2 vs 9.3 ± 0.2 mm; P < 0.01). In conclusion, lesser amounts of P4 in the intravaginal device or PGF on Day 0 decreased plasma P4 from Days 1 to 8 and increased diameter of the dominant follicle on Day 9. However, neither of these nor 300 IU of eCG on Day 8 significantly increased rates of ovulation or pregnancy. © 2011.en
dc.description.affiliationDepartment of Pharmacology Institute of Bioscience University of Sao Paulo State, 18618-970, Botucatu, São Paulo
dc.description.affiliationDepartment of Biostatistics Institute of Bioscience University of São Paulo State, 18618-970, Botucatu, São Paulo
dc.format.extent17-23
dc.identifierhttp://dx.doi.org/10.1016/j.theriogenology.2010.07.005
dc.identifier.citationTheriogenology, v. 75, n. 1, p. 17-23, 2011.
dc.identifier.doi10.1016/j.theriogenology.2010.07.005
dc.identifier.issn0093-691X
dc.identifier.lattes3720489366427955
dc.identifier.lattes7795883009987806
dc.identifier.scopus2-s2.0-78649860790
dc.identifier.urihttp://hdl.handle.net/11449/72252
dc.language.isoeng
dc.relation.ispartofTheriogenology
dc.relation.ispartofjcr2.136
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectBos indicus
dc.subjectFixed-time artificial insemination
dc.subjectNellore heifers
dc.subjectProgesterone
dc.subjectchorionic gonadotropin
dc.subjectdrug derivative
dc.subjectestradiol
dc.subjectestradiol 3-benzoate
dc.subjectestradiol benzoate
dc.subjectprogesterone
dc.subjectprostaglandin F
dc.subjectanimal
dc.subjectanimal disease
dc.subjectartificial insemination
dc.subjectblood
dc.subjectcattle
dc.subjectclinical trial
dc.subjectcontrolled clinical trial
dc.subjectcontrolled study
dc.subjectdrug effect
dc.subjectfemale
dc.subjectmethodology
dc.subjectovulation
dc.subjectovulation induction
dc.subjectphysiology
dc.subjectpregnancy
dc.subjectpregnancy rate
dc.subjectrandomized controlled trial
dc.subjectAnimals
dc.subjectCattle
dc.subjectChorionic Gonadotropin
dc.subjectEstradiol
dc.subjectFemale
dc.subjectInsemination, Artificial
dc.subjectOvulation
dc.subjectOvulation Induction
dc.subjectPregnancy
dc.subjectPregnancy Rate
dc.subjectProstaglandins F
dc.titleNeither plasma progesterone concentrations nor exogenous eCG affects rates of ovulation or pregnancy in fixed-time artificial insemination (FTAI) protocols for puberal Nellore heifersen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
unesp.author.lattes3720489366427955
unesp.author.lattes7795883009987806
unesp.author.orcid0000-0003-1106-8505[5]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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