Title:	GnRH potential to synchronize follicular emergence and ovulation prior to superovulatory day 0 protocol in sheep.
Authors:	SOUZA-FABJAN, J. M. G. BALARO, M. F. A. BARBOSA, T. G. B. FONSECA, J. F. da FIGUEIRA, L. M. TEIXEIRA, T. A. CARVALHEIRA, L. R. BRANDÃO, F. Z.
Affiliation:	Fluminense Federal University (UFF) - Niteroi, RJ, Brazil; JEFERSON FERREIRA DA FONSECA, CNPC.
Date Issued:	2015
Citation:	Animal Reproduction, v. 12, n. 3, p. 712, Jul./Sept. 2015.
Description:	The role of GnRH to synchronize ovulation and follicular emergence previous to superovulatory protocol, started on the first day of the estrous cycle (Day 0), was assessed in Santa Inês ewes. For estrus synchronization, 60 mg medroxyprogesterone acetate sponges were used for 6 d plus 37.5 ?g d-cloprostenol and 300 IU eCG at fifth day. After sponge removal, ewes were assigned to three treatments: GControl ? saline at 12 h (n = 10); G24h ? GnRH at 24 h (n = 10); or G36h ? GnRH at 36 h (n = 9). In conclusion, considering the beneficial effects of G36h in synchronizing ovulation and to promote the absence of dominant follicles in the first days of estrous cycle. According to data obtained, the best time to start the superovulatory treatment, known as "Day 0", could be 80 h after sponge removal (56 h for the occurrence of ovulation plus 24 h to reset dominant follicles), in the induction of synchronized estrus, for Santa Inês ewes.
Thesagro:	Ovino Reprodução animal Ovulação Ciclo estral Superovulação Progesterona Estradiol
NAL Thesaurus:	Sheep Ewes Reproduction Superovulation Ovulation Progesterone
Keywords:	MOET Lecirelin Santa Inês Synchronization Oestrous cycle
Notes:	Proceedings of the 29th Annual Meeting of the Brazilian Embryo Technology Society (SBTE); Gramado, RS, Brazil, August 20th to 23rd, 2015, and 31st Meeting of the European Embryo Transfer Association (AETE); Ghent, Belgium, September 11th and 12th, 2015.
Type of Material:	Resumo em anais e proceedings
Access:	openAccess
Appears in Collections:	Resumo em anais de congresso (CNPC)