Controlled ovulation of the dominant follicle: a critical role for LH in the late follicular phase of the menstrual cycle

A method was sought to control ovulation of the dominant follicle and to test the importance of LH during the late follicular phase of the menstrual cycle. Menstrual cycles of rhesus monkeys were monitored, and treatment initiated at the late follicular phase (after dominant follicle selection, before ovulation).