Changes in plasma concentrations of gonadotropins and steroid hormones during the formation of bovine follicular cysts induced by the administration of ACTH.
Bovine follicular cysts were induced by treatments with ACTH (3 mg, im) daily for 14 days beginning in the late luteal phase. Cortisol concentrations in plasma significantly increased after ACTH treatments. During the formation of follicular cysts induced by the injections of ACTH, mean plasma concentrations of progesterone were significantly higher than those in the untreated preovulatory period, while mean plasma concentrations of estradiol-17 beta were significantly lower. During the treatment period, mean plasma concentrations of LH and FSH remained low, and the preovulatory surges of LH and FSH did not occur. Suppressed concentrations of LH and FSH might be caused by the increases in secretions of cortisol and progesterone, and by the decrease in secretion of estradiol-17 beta.
Kawate
N
N
Department of Animal Reproduction, College of Agriculture, University of Osaka Prefecture, Japan.
Inaba
T
T
Mori
J
J
D000324:Adrenocorticotropic Hormone / Q000009:adverse effects*; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000097:blood* / Q000139:chemically induced; D004958:Estradiol / Q000097:blood; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D005497:Follicular Cyst / Q000097:blood / Q000139:chemically induced / Q000662:veterinary*; D006062:Gonadotropins / Q000097:blood*; D006854:Hydrocortisone / Q000097:blood; D007986:Luteinizing Hormone / Q000097:blood; D011374:Progesterone / Q000097:blood; D013256:Steroids / Q000097:blood*
D006062:Gonadotropins; D013256:Steroids; D011374:Progesterone; D004958:Estradiol; D000324:Adrenocorticotropic Hormone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D006854:Hydrocortisone