although it is known that lh secretion starts at 17 days of gestation in the fetal rat and that this first lh release is most likely driven by hypothalamic gnrh , an earlier role for gnrh during fetal life has been postulated with the observation that presence of gnrh is important before day 13 of gestation for the differentiation of the pituitary anlage .
C0020663
hypothalamic
C0023610
gnrh