ANSC 340 Lecture Notes - Lecture 10: Gonad, Human Chorionic Gonadotropin, Anterior Pituitary
4 Oct 2016
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Document Summary
Testosterone, estrogen, progesterone, inhibin, activing (endometrium of) uterus. Important in: development of female vs male brain; regulation of puberty; seasonal breeders. Ex: fall vs spring sheep breeders short day breeders . Mare: breed in spring, give birth next spring. Prolactin- lactation/maternal behavior ecg/hcg- can be used in other species. Produced by neurons in the hypothalamus (neuro-peptide) gnrh & kisspeptin. Causes release of other hormones from the anterior pituitary. E. g. gonadotropin (lh + fsh) releasing hormone gnrh (kisspeptin is attached to gnrh) Stimulates lh/fsh release, initiating cascade of reproductive events. In female, comes from tonic & surge center of hypothalamus. Body will respond to supplementation even if not at puberty yet. Decreasing p4= increase gnrh drip rate [e2 is increasing because cycling] Controls fsh/lh release rate and levels in the blood. Surge center- similar to a bucket of ice water being dumped at once; causes cascade of events that lead to ovulation.
