EstrusEstrus DetectionEstrus SynchronizationInsemination, ArtificialMelengestrol AcetateOvulationProgesteroneProgesterone CongenersEstrous CycleDiestrusDinoprostPregnancySexual MaturationPregnenedionesFertilityCattleEstradiolProestrusPostpartum PeriodLitter SizeGonadotropins, EquineReproductionSwineWeaningAdministration, IntravaginalLactationLuteinizing HormoneCorpus LuteumPregnancy, AnimalSexual Behavior, AnimalDrug ImplantsOvaryPregnadienesAnestrusOvarian FolliclePregnancy RateGonadotropin-Releasing HormoneRandom AllocationUterusFertility AgentsMetestrusBreedingAnimal HusbandryFertilizationTrenbolone AcetateOvariectomyCopulationFollicle Stimulating HormoneSheepHousing, AnimalTime FactorsProgestinsProstaglandins FFertility Agents, FemaleDairyingParityInjections, IntramuscularAnimals, SucklingPessariesChorionic GonadotropinLuteolysisFlurogestone AcetateVaginaPituitary Hormone-Releasing HormonesPseudopregnancySuperovulationOvulation DetectionLuteal PhaseBody WeightAnimal FeedSeasonsProstaglandins F, SyntheticDrug CombinationsBuserelinEndometriumAbortifacient AgentsGenitalia, FemaleFallopian TubesEstrogensAnimal Population GroupsLeast-Squares AnalysisRadioimmunoassayHydroxytestosteronesFollicular FluidOvulation InductionCervix MucusProlactinAnimal Nutritional Physiological PhenomenaPheromonesGonadal Steroid HormonesOxytocinGonadotropinsSerbiaLuteolytic AgentsVulvaHorsesContraceptive Agents, Female