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.
Menstruation is the body's way of shedding the uterine lining. Each woman has a unique cycle, although the average cycle is 28 days long. The average period lasts from three to five days. It is easy for most women to track ovulation with a little practice.