|
|
|
|
|
| BRAGANÇA, G. M.; SOUZA-FABJAN, J. M. G.; BATISTA, R. I. T. P.; RIBEIRO, L. S.; BRAIR, V. L.; CÔRTES, L. R.; SOUZA, C. V.; TRAIRA, A. R.; FONSECA, J. F. da; MENCHACA, A.; BRANDÃO, F. Z.. |
| In attempt to develop a hormonal protocol more suitable to produce good quality oocytes for use in biotechnologies, an earlier study demonstrated that FSH applied in multiple decreasing doses produced better quality oocytes. However, different progestagens implants used during ovarian stimulation have not yet been tested. The aim of this study was to investigate the effect of different progestagens during ovarian stimulation on follicular population and oocyte morphological quality in Santa Inês ewes. In conclusion, the source of progestagens used during the ovarian stimulation protocol does not affect the follicular population, nor the oocyte quality. Exogenous progestagens may not be necessary when postsynchronization ovulation is confirmed by... |
| Tipo: Resumo em anais de congresso (ALICE) |
Palavras-chave: Animal reproduction; Sheep; Ewes; Oocytes. |
| Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1095105 |
| |
|
|
| BRAGANÇA, G. M.; BATISTA, R. I. T. P.; SOUZA, C. V.; SANTOS, J. D. R.; ARASHIRO, E. K. N.; FONSECA, J. F. da; BRANDÃO, F. Z.; SOUZA-FABJAN, J. M. G.. |
| Progesterone (P4) and its analogues (progestins) are commonly used in estrus synchronization protocols and to hold the LH surge during ovarian stimulation to allow oocyte recovery in live donor ewes. However, recent evidence suggests that some progestins may have a deleterious effect on embryo quality after long-term use. Thus, the present study aimed to evaluate the effect of two progestin devices used during ovarian stimulation on the COC quality in donor ewes. In conclusion, the progestin device alters the expression of genes related to quality and the steroidogenesis pathway in fully-grown COCs, and the use of a natural P4 device may improve the development competence of COCs. Further studies including IVP are necessary to confirm our findings. |
| Tipo: Resumo em anais de congresso (ALICE) |
Palavras-chave: Ovino; Reprodução Animal; Transferência de Embrião; Sheep; Oocytes; Progestogen receptors; Steroid hormones; Embryo transfer; Ewes. |
| Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1095158 |
| |
|
|
|
