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.
Determining an ovulation cycle requires determining the length of the menstrual cycle. An adult woman's reproductive system. The calendar method is one way to calculate a woman's ovulation cycle. Timing intercourse during the days leading up to ovulation is the best way to achieve pregnancy. Recording body temperature daily may help a woman keep track of ovulation cycles.