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treatment animal female weight study body weight control birth participant growth effect therapy patient length deprivation difference food-deprived experiment result group table dysfunction period litter problem ejaculation erectile behavior behaviour mother number internet satisfaction ovariectomy development androgen stumptail monkey month score macaque cycle sex therapy erectile dysfunction figure ovariectomized therapist tadala fil stumptail macaques curvature castrated disease measure partner adulthood incubator tadala control animals tail length peyronie food deprivation follow-up activity level body length range desire pattern erasmus university ovulation ef ficacy signi males castrated phase adult postnatal research macaca method hormone