AnestrusEstrusLuteinizing HormoneSeasonsSheepProgesteronePituitary Hormone-Releasing HormonesBuffaloesPostpartum PeriodEstradiolBreedingOvulationFollicle Stimulating HormoneReproductionGonadotropin-Releasing HormoneDeerSecretory RateOvarian FollicleOvaryOvariectomyCorpus LuteumEstrus DetectionProlactinGonadotropins, EquineLactationPregnancyLuteal PhasePeriodicityEstrous CycleGonadotropins, PituitaryDrug ImplantsFertilityInfusion Pumps, ImplantableSexual MaturationCattleBromocriptineAnimal Nutritional Physiological PhenomenaCastrationFood DeprivationPregnancy, AnimalPituitary GlandPhotoperiodOvulation InductionMelatonin