EstrusEstrus DetectionEstrus SynchronizationInsemination, ArtificialMelengestrol AcetateOvulationProgesteroneEstrous CycleProgesterone CongenersDiestrusDinoprostPregnancyFertilitySexual MaturationSexual Behavior, AnimalReproductionEstradiolPregnenedionesCattleProestrusPostpartum PeriodLitter SizeGenitalia, FemaleOvaryGonadotropins, EquineLuteinizing HormoneLactationSwinePregnancy, AnimalWeaningAdministration, IntravaginalCorpus LuteumDrug ImplantsOvarian FollicleGonadotropin-Releasing HormoneRandom AllocationAnestrusUterusPregnadienesOvariectomyPregnancy RateCopulationSex CharacteristicsTime FactorsBreedingFertility AgentsFertilizationMetestrusAnimal HusbandryFollicle Stimulating HormoneBody WeightTrenbolone AcetateSheepHousing, AnimalVaginaProgestinsParitySex FactorsFertility Agents, FemaleProstaglandins FDairyingAnimals, SucklingInjections, IntramuscularChorionic GonadotropinEstrogensSeasonsPituitary Hormone-Releasing HormonesPseudopregnancyPessariesSuperovulationLuteolysisFlurogestone AcetateLuteal PhaseOvulation DetectionAnimal FeedGonadal Steroid HormonesFallopian TubesPheromonesEndometriumDrug CombinationsRadioimmunoassayOrgan SizeProstaglandins F, SyntheticCondoms, FemaleProlactinBuserelinSex RatioTestosteroneAbortifacient AgentsInseminationInfertility, FemaleAnimal Population GroupsLeast-Squares AnalysisCastrationRats, Sprague-DawleyAge FactorsOvulation InductionCervix MucusFollicular FluidHydroxytestosterones