EstrusEstrous CycleProgesteroneCell CycleCorpus LuteumDiestrusProestrusOvaryEstradiolUterusPregnancy, AnimalOvulationLuteinizing HormoneDinoprostOvarian FolliclePregnancyEndometriumCattleOvariectomyLuteolysisFollicle Stimulating HormoneLuteal PhaseMenstrual CycleSheepFollicular PhaseEstrus SynchronizationAnestrusOxytocinLuteal CellsGonadotropin-Releasing HormoneReproductionTime FactorsRNA, MessengerSwineFallopian TubesInhibinsVaginaGenitalia, FemaleCell Cycle ProteinsRadioimmunoassayEstrus DetectionFertilityPseudopregnancyMyometriumSexual MaturationPostpartum PeriodFollicular AtresiaEstrogensEmbryo ImplantationProstaglandins FImmunohistochemistryPregnancy ProteinsGonadal Steroid HormonesFollicular FluidPituitary Gland, AnteriorSuperovulationGonadotropinsPregnenedionesInsemination, ArtificialGranulosa CellsPituitary GlandRats, Sprague-DawleyRandom AllocationDrug ImplantsProlactin