Cumulus CellsOocytesFertilization in VitroOvarian FollicleCattleOogenesisMeiosisOocyte DonationOocyte RetrievalIn Vitro Oocyte Maturation TechniquesXenopus laevisSperm-Ovum InteractionsFertilizationBlastocystOvaryXenopusEmbryonic DevelopmentOvumMetaphaseMicroinjectionsParthenogenesisGranulosa CellsSperm Injections, IntracytoplasmicZona PellucidaEmbryo TransferBone Morphogenetic Protein 15CryopreservationSpermatozoaFollicular FluidGrowth Differentiation Factor 9