( Butcher et al . 1974 , Robker & Richards 1998 , Freeman 2006 ). Actions of E 2 at the hypothalamus can induce female sexual receptivity ( Pfaff 1980 ). After fertilization, E 2 influences the rate of passage of fertilized ova through the fallopian
( Butcher et al . 1974 , Robker & Richards 1998 , Freeman 2006 ). Actions of E 2 at the hypothalamus can induce female sexual receptivity ( Pfaff 1980 ). After fertilization, E 2 influences the rate of passage of fertilized ova through the fallopian