02307naa a2200385 a 450000100080000000500110000800800410001902200140006002400580007410000210013224501020015326000090025552011640026465000330142865000140146165000100147565000210148565000270150665000100153365300080154365300180155165300360156965300160160565300200162170000230164170000220166470000250168670000240171170000230173570000200175870000200177870000230179870000240182177300760184521518362023-03-01       2022    bl uuuu     u00u1 u    #d  a1676-546X7 ahttps://doi.org/10.5433/1679-0359.2022v43n6p27312DOI1 aBASTOS, B. D. M.  aEffect of different gonadotropins on in vitro maturation of sheep oocytes.h[electronic resource]  c2022  aThe aim of this study was to examine the effect of replacing the use of follicle-stimulating hormone (FSH) with equine chorionic gonadotropin (eCG) and human chorionic gonadotropin (hCG) on the in vitro maturation (IVM) of sheep oocytes. After sheep ovaries were collected (n=300), the cumulus-oocyte complexes were aspirated, selected, and divided into four groups according to the IVM medium: CON group, in which the basic IVM medium was used; and eCG, hCG, and FSH groups, in which the oocytes were immersed in basic IVM medium with 10 IU/mL eCG, 10 IU/mL hCG, and 10 μg/mL FSH-p, respectively. In vitro maturation of the oocytes was performed at 38.5 °C, in a humidified atmosphere of 5% CO2 in air, for 24 h. Subsequently, the oocytes were evaluated for the degree of cumulus-cell expansion, chromatin configuration, GSH levels, and active mitochondria. There were no significant differences for the rate of cumulus cell expansion. The percentage of oocytes in MII was higher in the eCG group than in the CON and hCG groups (P&lt0.05) and similar to that of the FSH group. In conclusion, eCG can be used as a substitute for FSH in IVM of sheep oocytes.  aFollicle-stimulating hormone  aMetaphase  aSheep  aHormônio Animal  aMaturação Artificial  aOvino  aGSH  aHoechst 33342  aHormônio folículo estimulante  aMetafase II  aOócitos ovinos1 aSILVA, N. P. da S.1 aGONÇALVES, P. R.1 aCANDIDO, A. E. C. M.1 aBARBERINO, R. de S.1 aMONTE, A. P. O. do1 aNOGUEIRA, D. M.1 aCORDEIRO, M. F.1 aMATOS, M. H. T. de1 aLOPES JUNIOR, E. S.  tSemina: Ciências Agráriasgv. 43, N. 6, p. 2731-2742, nov./dez. 2022.