| Abstract: | Concentrations of follicle stimulating hormone (FSH) and luteinizing hormone (LH) in central (C) samples obtained by transfemorally catheterizing the inferior petrosal sinus of female bonnet monkeys were compared with those in peripheral (P) samples obtained simultaneously from the saphenous veins of two intact and two oophorectomized bonnet monkeys, before, during, and after luteinizing hormone releasing hormone (LHRH) stimulation. Significant differences between central and peripheral gonadotropin concentrations were detected intermittently in the resting state, and tended to be magnified by LHRH administration. In one animal in which LHRH was fortuitously administered during the course of a spontaneous LH surge, a C/P ratio for LH of 12.71, the maximum observed, was obtained. Spectral analysis exhibited periodicity for LH and, to a lesser extent, for FSH in the oophorectomized, but not in the intact, animals. |
