DiestrusEstrusEstrus DetectionEstrus SynchronizationEstrous CycleProestrusMetestrusProgesteroneOvulationEstradiolOvaryInsemination, ArtificialOvariectomyUterusPregnancyLuteinizing HormoneCorpus LuteumMelengestrol AcetatePregnancy, AnimalDinoprostProgesterone CongenersSexual MaturationGonadotropin-Releasing HormoneGonadotropins, EquineOvarian FollicleProlactinLactationFertilityVaginaFollicle Stimulating HormoneCattlePseudopregnancyReproductionDrug ImplantsSexual Behavior, AnimalHorsesPregnenedionesEndometriumPostpartum PeriodEstrogensLitter SizeLuteolysisGonadal Steroid HormonesRadioimmunoassayProgestinsPituitary Gland, AnteriorFallopian TubesSwineReceptors, ProlactinRats, WistarWeaningAdministration, IntravaginalFollicular AtresiaRats, Sprague-DawleyTime FactorsCastrationPregnadienesAnestrusSucking BehaviorParturitionChorionic GonadotropinPregnancy RateRandom AllocationRats, Inbred StrainsPituitary GlandOxytocinBromocriptineFertility AgentsTestosteroneMifepristone