Estrous CycleEstrusProgesteroneCorpus LuteumCell CycleDiestrusCattleOvaryProestrusEstradiolPregnancy, AnimalOvulationUterusDinoprostLuteinizing HormonePregnancyOvarian FollicleEndometriumOvariectomyLuteolysisEstrus SynchronizationPostpartum PeriodFollicle Stimulating HormoneLuteal PhaseSheepAnestrusFollicular PhaseMenstrual CycleReproductionLactationGonadotropin-Releasing HormoneOxytocinDairyingEstrus DetectionInsemination, ArtificialLuteal CellsFallopian TubesFertilityRNA, MessengerMilkTime FactorsSwineInhibinsRadioimmunoassayVaginaGenitalia, FemaleCattle DiseasesRandom AllocationCell Cycle ProteinsPregnenedionesSexual MaturationProstaglandins FPseudopregnancyFollicular AtresiaMyometriumSuperovulationProgesterone CongenersEstrogensBreedingEmbryo ImplantationMelengestrol AcetatePregnancy ProteinsFollicular FluidImmunohistochemistryDrug ImplantsPituitary Gland, AnteriorGonadal Steroid HormonesGonadotropinsPituitary GlandGranulosa CellsFollicular CystAnimal FeedProlactinCloprostenolCorpus Luteum MaintenanceHormonesAdministration, IntravaginalTheca CellsBody WeightRats, Sprague-DawleyAnimal Nutritional Physiological PhenomenaChorionic Gonadotropin5-alpha-DihydroprogesteroneCitric Acid CycleMastitis, BovineOrgan SizePregnancy RatePregnadienesGene ExpressionSexual Behavior, AnimalGene Expression RegulationReverse Transcriptase Polymerase Chain ReactionIn Situ HybridizationAndrostenedioneSeasonsHorses20-alpha-Hydroxysteroid DehydrogenaseNeurophysinsMonocrotophosBuserelin