Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/57331
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dc.creatorSá Filho, M. F.-
dc.creatorSantos, J. E. P.-
dc.creatorFerreira, R. M.-
dc.creatorSales, J. N. S.-
dc.creatorBaruselli, P. S.-
dc.date.accessioned2020-01-23T18:01:43Z-
dc.date.accessioned2023-06-27T18:38:17Z-
dc.date.available2020-01-23T18:01:43Z-
dc.date.available2023-06-27T18:38:17Z-
dc.date.issued2011-08-
dc.identifier.citationSÁ FILHO, M. F.; SANTOS, J. E. P.; FERREIRA, R. M.; SALES, J. N. S.; BARUSELLI, P. S. Importance of estrus on pregnancy per insemination in suckled Bos indicus cows submitted to estradiol/progesterone-based timed insemination protocols. Theriogenology, Stoneham, v. 76, n. 3, p. 455-463, Aug. 2011.pt_BR
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0093691X1100104X?via%3Dihub#!pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/57331-
dc.description.abstractThe objective was to evaluate the effect of estrus occurrence (based on removal of tail-head marks) on ovarian responses and pregnancy per AI (P/AI; 30 d after AI) in suckled Bos indicus beef cows submitted to timed AI (TAI) protocols. Cows received an intravaginal device containing 1.0 g progesterone, and 2.0 mg estradiol benzoate im; 8 d later, the intravaginal device was removed, and they were given PGF2α (0.25 mg of cloprostenol sodium) and 300 IU of eCG, with TAI 48 to 52 h later. In Experiment 1, cows were assigned to receive one of three treatments: 1 mg of estradiol cypionate (ECP) im at progesterone (P4) device removal (N = 178); 10 μg of GnRH im at TAI (N = 190); or both treatments (N = 172). In cows given estradiol (ECP or ECP + GnRH), more displayed estrus (P = 0.002) and became pregnant (P < 0.0001) compared with those receiving only GnRH. In Experiment 2, the effect of the occurrence of estrus on ovarian responses was evaluated in cows (N = 53) synchronized using ECP at device removal. Cows that displayed estrus had a greater diameter of the largest follicle (LF) at device removal (P < 0.0001), a greater diameter at TAI (P < 0.0001), a greater ovulation rate (P = 0.02), a larger CL (P = 0.02), and a greater P4 concentration (P < 0.0001) than cows that did not display estrus. In Experiment 3, the effect of GnRH treatment on P/AI at TAI was evaluated in cows that received ECP at device removal, and either displayed, or did not display, estrus (N = 726). There was no estrus by GnRH interaction (P = 0.22); the P/AI was greater (P < 0.0001) in cows that displayed estrus (61.9%) than cows that did not display estrus (41.4%). However, GnRH did not improve (P = 0.81) P/AI (GnRH = 53.7% vs. no GnRH = 52.6%). In conclusion, exogenous estradiol at device removal increased both the proportion of suckled Bos indicus cows that displayed estrus and P/AI. Cows that displayed estrus had better ovarian responses (i.e., larger follicles at TAI, a greater ovulation rate, larger CL, and greater P4 concentrations) following an estradiol/P4-based synchronization protocol. Although occurrence of estrus improved pregnancy outcomes, GnRH at TAI did not improve P/AI in suckled Bos indicus cows treated with ECP, regardless of estrus occurrence.pt_BR
dc.languageen_USpt_BR
dc.publisherElsevierpt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceTheriogenologypt_BR
dc.subjectEstradiol cypionatept_BR
dc.subjectNelore - Reproductionpt_BR
dc.subjectCipionato de estradiolpt_BR
dc.subjectNelore - Reproduçãopt_BR
dc.titleImportance of estrus on pregnancy per insemination in suckled Bos indicus cows submitted to estradiol/progesterone-based timed insemination protocolspt_BR
dc.typeArtigopt_BR
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