ANSC 3180 Lecture Notes - Lecture 15: Luteolysis, Estrous Cycle, Corpus Luteum
24 Apr 2019
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Ends with ovulation (induced by lh peak) Follicles grow but no ovulation occurs because of the negative feedback of progesterone on the gnrh surge center. When p4 is high, only the tonic center will be secreting basal level of gnrh. The cl is a transient gland, will be demise after luteolysis. Frequency of gnrh pulses increases gradually with the positive feedback of estradiol in the surge center, leading to a surge in gnrh. Pattern of lh secretion follows the pattern of gnrh secretion, and a surge in lh secretion also occurs. The preovulatory surge of lh causes ovulation of large dominant follicles. When there is a surge in gnrh = surge in two gonadotropins. Even with inhibin, the surge in gnrh will lead to a small surge in fsh during estrus. Small surge of fsh = recruitment of new follicles after ovulation. Some primordial follicles are activated and develop to primary and secondary follicle stages.
