in order to study the sequence of hormonal changes that accompany the onset of puberty in the female rat , immature animals were sacrificed by decapitation between days 32 and 38 , and plasma titers of gonadotropins , prolactin , and lhrh , and the hypothalamic content of lhrh were determined by specific radoimmunoassays ( ria ) .
C0020663
hypothalamic
C0023610
lhrh