Effects of temporary calf removal and eCG on pregnancy rates to timed-insemination in progesterone-treated postpartum Nellore cows

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorPinheiro, V. G.
dc.creatorSouza, A. F.
dc.creatorPegorer, M. F.
dc.creatorSatrapa, R. A.
dc.creatorEreno, Ronaldo Luiz
dc.creatorTrinca, L. A.
dc.creatorBarros, C. M.
dc.date2014-05-20T15:32:23Z
dc.date2016-10-25T18:08:36Z
dc.date2014-05-20T15:32:23Z
dc.date2016-10-25T18:08:36Z
dc.date2009-02-01
dc.date.accessioned2017-04-06T00:27:26Z
dc.date.available2017-04-06T00:27:26Z
dc.identifierTheriogenology. New York: Elsevier B.V., v. 71, n. 3, p. 519-524, 2009.
dc.identifier0093-691X
dc.identifierhttp://hdl.handle.net/11449/41304
dc.identifierhttp://acervodigital.unesp.br/handle/11449/41304
dc.identifier10.1016/j.theriogenology.2008.08.018
dc.identifierWOS:000262346700015
dc.identifierhttp://dx.doi.org/10.1016/j.theriogenology.2008.08.018
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/884014
dc.descriptionThe objective was to evaluate the effects of temporary calf removal (TCR), eCG administration, or both, in a progesterone-based protocol. Suckled Nellore cows (40-80 d postpartum, n = 443) with body condition scores from 2.0 to 3.5 (5-point scale) on three farms were all given a synchronizing protocol (PEPE). At the start (designated Day 0), cows were given an intravaginal device (1.0 g of progesterone) and 2.5 mg of estradiol benzoate (EB) im. on Day 8, the device was removed and cows were given PGF(2 alpha) (150 mu g of D-cloprostenol im), followed in 24 h by 1.0 mg EB im, and 30-36 h thereafter, fixed-time AI. The design was a 2 x 2 factorial; main effects were TCR (54-60 h; from device removal to FTAI) and eCG treatment (300 IU im, concurrent with PGF(2 alpha)). Transrectal ultrasonography was done on Days - 10 and 0 to detect anestrus (absence of a CL at both examinations) and similar to 30 d after FTAI (pregnancy diagnosis). Data were analyzed by logistic regression. The following variables did not significantly affect pregnancy rates: farm, postpartum interval, cyclicity, inseminators, and semen (sire). Overall, 77% of the cows were deemed anestrus. Pregnancy rates were similar (P > 0.05) among treatment groups: Control (54/108 = 50.0%), TCR (44/106 = 41.5%), eCG (63/116 = 54.3%), and TCR + eCG (49/113 = 43.4%). Pregnancy rate was higher in multiparous than primiparous cows (186/360, 51.7% vs. 24/83,28.9%, P < 0.01), but was not significantly affected by cyclicity status or body condition score. In conclusion, temporary calf removal, eCG, or both, did not significantly increase pregnancy rate to timed-insemination in a progesterone-based synchronization protocol in postpartum Nellore cows with acceptable body condition. (C) 2009 Elsevier B.V. All rights reserved.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languageeng
dc.publisherElsevier B.V.
dc.relationTheriogenology
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectFixed-time artificial insemination
dc.subjectProgesterone
dc.subjectBovine
dc.subjecteCG
dc.subjectTemporary calf removal
dc.titleEffects of temporary calf removal and eCG on pregnancy rates to timed-insemination in progesterone-treated postpartum Nellore cows
dc.typeOtro


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