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dc.contributor.authorSILVA, S. A.
dc.contributor.authorMONDADORI, R. G.
dc.contributor.authorNOLETO, G. S.
dc.contributor.authorBARBOSA, I. P.
dc.contributor.authorGONÇALVES, R. L.
dc.contributor.authorGASPERIN, B. G.
dc.contributor.authorROVANI, M. T.
dc.contributor.authorPAZ, E. F.
dc.contributor.authorGOMES, L. S.
dc.contributor.authorPFEIFER, L. F. M.
dc.date.accessioned2023-06-29T20:23:58Z-
dc.date.available2023-06-29T20:23:58Z-
dc.date.created2023-06-29
dc.date.issued2023
dc.identifier.citationTheriogenology, v. 209, p. 134-140, 2023.
dc.identifier.issn0093-691X
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1154705-
dc.descriptionTwo experiments were performed to evaluate the effects of GnRH treatment on the fertility of suckled Nelore beef cows treated with an estradiol/progesterone (E2/P4)-based protocol for timed artificial insemination (TAI). Experiment 1 focused on determining the effects of estradiol cypionate (EC) on ovulation in TAI cows treated with GnRH 34 h after removal of the intravaginal P4 device (IPD). Suckled cows (n ¼ 26) were treated with 2 mg estradiol benzoate (EB) and IPD containing 1 g P4. After 8 days, IPDs were removed, and all cows were treated with 150 mg of d-cloprostenol (prostaglandin F2 alpha analog) and 300 IU of equine chorionic gonadotropin (eCG), then separated into two treatment groups consisting of cows who received 1) saline 0.9% i.m. (GnRH34 group) or 2) 0.6 mg i.m. of EC (EC-GnRH34 group). On day 9 (05:00 p.m.), all cows were given GnRH (10.5 mg of buserelin acetate) i.m. No differences were observed between the groups (P > 0.05) in the time of ovulation after IPD removal or in the proportion of cows ovulating. Experiment 2 focused on determining the effects of GnRH34 along with or in the absence of EC on day 8 on pregnancy per AI (P/AI) in postpartum beef cows. Cows (n ¼ 981) were treated similarly to those in Experiment 1, but an additional group, the EC-GnRH48 group, was included, in which cows received EC on day 8 whereas those that did not show estrus received GnRH at TAI. Thus, in this experiment, groups consisted of GnRH34 (n ¼ 322), EC-GnRH34 (n ¼ 335), and EC-GnRH48 (n ¼ 324). A higher rate of estrus expression was observed in cows treated with EC following IPD removal (EC-GnRH34: 69%, EC-GnRH48: 64.8%) than in cows in the GnRH34 group (45.6%). No difference in P/AI was observed between the treatment groups (P ¼ 0.45), but P/AI in cows in the EC-GnRH34 group (64.2%) tended to be greater (P ¼ 0.1) than in cows in the GnRH34 group (58%). In summary, although ovulation synchrony did not differ among the groups, P/AI in cows treated with EC and GnRH 34 h after IPD removal tended to be greater than in cows treated solely with GnRH; this was most likely due to a shorter proestrus/estrus period, considering the lower proportion of cows that displayed estrus in the GnRH34 group. Finally, given that P/AI did not differ between the EC-GnRH34 and EC-GnRH48 groups, our results suggest that, for cows not displaying estrus, administration of EC at the time of IPD removal followed by treatment with GnRH 48 h afterward represents the most cost-efficient TAI strategy for South American Zebu-based beef operations.
dc.language.isoeng
dc.rightsopenAccess
dc.subjectEmbrapa Rondôna
dc.subjectAmazônia Ocidental
dc.subjectWestern Amazon
dc.titleGnRH34 with or without estradiol cypionate in timed AI in Bos indicus beef cows.
dc.typeArtigo de periódico
dc.subject.thesagroReprodução Animal
dc.subject.thesagroFertilidade Animal
dc.subject.thesagroHormônio
dc.subject.thesagroEstradiol
dc.subject.thesagroGado Nelore
dc.subject.thesagroVaca de Corte
dc.subject.thesagroBos Indicus
dc.subject.thesagroPrenhez
dc.subject.thesagroOvulação
dc.subject.thesagroCampo Experimental
dc.subject.nalthesaurusAnimal reproduction
dc.subject.nalthesaurusAnimal fertility
dc.subject.nalthesaurusNellore
dc.subject.nalthesaurusBeef cows
dc.subject.nalthesaurusHormones
dc.subject.nalthesaurusPregnancy
dc.subject.nalthesaurusOvulation
dc.subject.nalthesaurusDemonstration farms
riaa.ainfo.id1154705
riaa.ainfo.lastupdate2023-06-29
dc.identifier.doihttps://doi.org/10.1016/j.theriogenology.2023.06.026
dc.contributor.institutionSAMIRA A. SILVA, UNIVERSIDADE FEDERAL DE PELOTAS; RAFAEL G. MONDADORI, UNIVERSIDADE FEDERAL DE PELOTAS; GABRIELLY S. NOLETO, UNIVERSIDADE FEDERAL DE RONDÔNIA; INGRID P. BARBOSA, UNIVERSIDADE FEDERAL DO ACRE; REUEL L. GONÇALVES, BIOGENESIS BAGO SAÚDE ANIMAL; BERNARDO G. GASPERIN, UNIVERSIDADE FEDERAL DE PELOTAS; MONIQUE T. ROVANI, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; EANES F. PAZ, ASSITÊNCIA TÉCNICA E EXTENSÃO RURAL; LEONARDO S. GOMES, Embrapa Rondônia; LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO.
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