hypophyseal and ovarian receptors for the neurohormone lhrh ( lhrh-r ) have been measured in young ( 3-4 months ) , middle-aged ( 8-11 months ) , constant estrous ( ce , 10-14 months ) and pseudopregnant ( pr , 16-18 months ) rats in order to study whether changes in hypothalamic and/or peripheral lhrh-like peptide production might precede and/or accompany the onset of reproductive failure observed in aging rats .
C0020663
hypothalamic
C0023610
lhrh