Comparison of progesterone-based protocols with gonadotropin-releasing hormone or estradiol benzoate for timed artificial insemination or embryo transfer in lactating dairy cows

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dc.contributor.authorVasconcelos, José Luiz Moraes [UNESP]
dc.contributor.authorJardina, D. T. G. [UNESP]
dc.contributor.authorSa Filho, O. G. [UNESP]
dc.contributor.authorAragon, F. L.
dc.contributor.authorVeras, M. B.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionPioneiros Vet Clin
dc.date.accessioned2013-09-30T18:27:45Z
dc.date.accessioned2014-05-20T13:41:19Z
dc.date.available2013-09-30T18:27:45Z
dc.date.available2014-05-20T13:41:19Z
dc.date.issued2011-04-01
dc.description.abstractThe objective was to compare two protocols for synchronizing ovulation in lactating Holstein cows submitted to timed AI (TAI) or timed ET (TET). Within each farm (n = 8), cows (n = 883; mean +/- SEM 166.24 +/- 3.27 d postpartum, yielding 36.8 +/- 0.34 kg of milk/d) were randomly assigned to receive either: 1) an intravaginal progesterone insert (CIDR (R)) with 1.9 g of progesterone + GnRH on Day -10, CIDR (R) withdrawal + PGF2 alpha on Day -3, and 1 mg estradiol cypionate on Day -2 (treatment GP-P-E; n(TAI) = 180; n(TET) = 260); or 2) a CIDR (R) insert + 2 mg estradiol benzoate on Day -10, PGF2 alpha on Day -3, CIDR (R) withdrawal + 1 mg estradiol cypionate on Day -2 (treatment EP-P-E; n(TAI) = 174; n(TET) = 269). Cows were subsequently randomly assigned to receive either TAT on Day 0 or TET on Day 7. Serum progesterone concentration on Day -3 was greater in GP-P-E than in EP-P-E (2.89 +/- 0.15 vs 2.29 +/- 0.15 ng/mL; P < 0.01), with no significant effect of group on serum progesterone on Day 7. Compared to cows submitted to TAI, those submitted to TET had greater pregnancy rates on Day 28 (44.0% [233/5291 vs 29.7% [105/354]; p < 0.001) and on Day 60 (37.6% [199/529] vs 26.5 [94/354]; P < 0.001). However, there were no effects of treatments (GP-P-E vs EP-P-E; P > 0.10) on synchronization (87.0% [383/440] vs 85.3% [378/443]), conception (TAI: 35.3% [55/156] vs 33.8% [50/148]; TET: 50.7% [115/227] vs 51.3% [118/230]) and pregnancy rates on Days 28 (TAT: 30.5% [55/180] vs 28.7% 150/174]; TET: 44.2% [115/260] vs 43.9% [118/2691) and 60 (TAI: 27.2% [49/80] vs 25.9% [45/174]; TET: 38.8% [101/260] vs 36.4% [98/269]). In conclusion, GP-P-E increased serum progesterone concentrations on Day -3, but rates of synchronization, conception, and pregnancy were not significantly different between cows submitted to GP-P-E and EP-P-E protocols, regardless of whether they were inseminated or received an embryo. (c) 2011 Elsevier B.V. All rights reserved.en
dc.description.affiliationUNESP, Fac Med Vet & Zootecnia, Dept Anim Prod, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationPioneiros Vet Clin, BR-84145000 Carambei, PR, Brazil
dc.description.affiliationUnespUNESP, Fac Med Vet & Zootecnia, Dept Anim Prod, BR-18618000 Botucatu, SP, Brazil
dc.format.extent1153-1160
dc.identifierhttp://dx.doi.org/10.1016/j.theriogenology.2010.11.027
dc.identifier.citationTheriogenology. New York: Elsevier B.V., v. 75, n. 6, p. 1153-1160, 2011.
dc.identifier.doi10.1016/j.theriogenology.2010.11.027
dc.identifier.issn0093-691X
dc.identifier.lattes1069922096621313
dc.identifier.urihttp://hdl.handle.net/11449/14324
dc.identifier.wosWOS:000288687500021
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofTheriogenology
dc.relation.ispartofjcr2.136
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectArtificial inseminationen
dc.subjectEmbryo transferen
dc.subjectEstrus synchronizationen
dc.subjectGnRHen
dc.subjectEstradiolen
dc.titleComparison of progesterone-based protocols with gonadotropin-releasing hormone or estradiol benzoate for timed artificial insemination or embryo transfer in lactating dairy cowsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes1069922096621313
unesp.author.orcid0000-0001-6324-3614[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Medicina Veterinária e Zootecnia, Botucatupt

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