A single Regional Dressage Championship program organized by the United States Dressage Federation (USDF), and recognized by the United States Equestrian Federation, Inc. (USEF), will be held in each of the nine USDF.
If fertilization and/or implantation does not take place, the system is designed to menstruate (the monthly shedding of the uterine lining). In addition, the female reproductive system produces female sex hormones that maintain the reproductive cycle.
female reproductive system - the reproductive system of females. female internal reproductive organ - the reproductive organs of a woman. Graafian follicle - a vascular body in a mammalian ovary enclosing a developing egg. gonad, sex gland - a gland in which gametes (sex cells) are produced.