title: Testosterone concentrations in plasma of dairy cows with ovarian cysts.
abstract: Testosterone in plasma was measured by radioimmunoassay in cows with ovarian cysts and in cows during the estrous cycle. Concentrations of testosterone in plasma (60.8 +/- 2.7 pg/ml; mean +/- standard error) in cows with ovarian cysts were variable but within the range in cows during the estrous cycle. Mean concentrations of testosterone in plasma increased from 46.3 pg/ml at estrus to 85.1 pg/ml on day 13 of the estrous cycle. In cows with ovarian cysts, concentrations of testosterone in plasma declined within 24 h following prostaglandin F2 alpha and tended to increase by 9 days following gonadotropin releasing hormone. The role of testosterone in estrual behavior and inhibiting resumption of ovarian cycles is likely minimal.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000097:blood*; D004971:Estrus; D005260:Female; D010048:Ovarian Cysts / Q000097:blood / Q000188:drug therapy / Q000662:veterinary*; D010906:Pituitary Hormone-Releasing Hormones / Q000627:therapeutic use; D011247:Pregnancy; D011460:Prostaglandins F / Q000627:therapeutic use; D011863:Radioimmunoassay; D013739:Testosterone / Q000097:blood*; D014316:Tritium
chemical_list: D010906:Pituitary Hormone-Releasing Hormones; D011460:Prostaglandins F; D014316:Tritium; D013739:Testosterone