Central Neural Control of Reproductive Functions of the Adenohypophysis

Effect of Progesterone on Induced Ovulation in Immature Rats

“…pmsg. Solutions of progesterone too concentrated or too dilute (Tables 3 and 5) (Rothchild, 1965;Everett, 1964). The oestrogen-progestin ratio is critical in maintaining post-coital lh levels in mated ovariectomized rabbits (Hilliard, Penardi & Sawyer, 1967 The results in Table 6 confirm the 24-hr periodicity of the release of ovulating hormone in rats (Everett & Sawyer, 1950;Strauss & Meyer, 1962;Ying & Meyer, 1969b (Rothchild, 1965).…”

Neonatal androgen abolishes clock-timed gonadotrophin release in prepubertal and adult female hamsters

“…Both the day of surge gonadotrophin release and the amplitude of the surge are determined by the sequential pattern of ovarian steroid secretion (Fink, 1979). The neural clock regulating the timing of the gonadotrophin surge is entrained by the environmental photocycle (Everett, 1964;Legan & Karsch, 1975 ; Stetson & Anderson, 1980). Androgenization of the neonatal rat or hamster results in an anovulatory sterility of the adult which derives from the tonic or non-cyclic release of LH and FSH (Gorski, 1979).…”

Mating Stimulation Required for Mating-Induced Estrous Abbreviation in Female Rats: Effects of Repeated Testing

“…Although the female receives many types of sensory cues (e.g., olfactory, auditory, and tactile) during mating, previous studies suggest that vaginal-cervical stimulation (VCS) received during intromissions and ejaculations is particularly important for inducing changes in sexual behavior and reproductive physiology. For example, VCS increases return latencies during paced mating (Yang and Clemens, 1997) and induces twice daily prolactin surges necessary to maintain pregnancy (Everett, 1964).…”