ADSC 3600 Lecture Notes - Lecture 12: Corpus Luteum, Estrous Cycle, Fallopian Tube
20 Feb 2017
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Gnrh - (release hormones form testacies) from hypothalamus stimulates release of fsh and lh from pituitary. Fsh (follicle stimulating hormone) stimulates follicles on the ovary to grow and mature. As estrogen levels increase, cows experience estrus (heat) behavior, stimulates release of more gnrh. Lh- stimulates ovulation of mature follicle and stimulates cell changes to produce a. Corpus luteum (yellow body). (estrogen drops: corpus luteum (on ovary) produces progesterone. Progesterone increases (peaks 5-6) and inhibits gnrh release (this inhibits fsh and lh). Less follicle stimulation, less estrogen: progesterone get the uterus ready for pregnancy. If the uterus doesn"t recognize pregnancy by about 17 days, the uterus will then release prostaglandin which causes regression of the corpus luteum. *you could synchronize cattle heat cycle by giving a shot of prostaglandin. Standing heat lasts about 18 hours (variable around 6-28 hours: heat varies within animals/breeds.
