Adrenal-testicular-pituitary relationships in the cheetah subjected to anesthesia/electroejaculation.

The influence of electroejaculation on the acute response in serum cortisol, testosterone and luteinizing hormone (LH) was studied in the South African cheetah . Males were either anesthetized with CT-1341 and 1) serially bled only (controls, n = 7) or 2) serially bled during and following a regimented protocol of rectal probe electroejaculation (n = 14). In the control cheetahs , mean cortisol concentrations declined over time (P less than 0.05) and neither testosterone nor LH varied over the 145-min sampling interval. Serum cortisol rose immediately in electroejaculated cheetahs , peaked at the end of electroejaculation in 13 of 14 males and then declined during the next 90 min. Temporal profiles and serum levels of testosterone and LH were similar in the electroejaculated and control groups (P greater than 0.05). Within individual cheetahs , serum levels of LH and testosterone were highly correlated (r = 0.77, P less than 0.01). Awake (n = 2) and CT-1341 anesthetized (n = 2) cheetahs also were bled and then challenged with an i.m. injection of 25 IU adrenocorticotropic hormone (ACTH, Cortrosyn). Serial blood samples were collected during the next 2 h and assayed. Cortisol concentrations prior to ACTH administration were greater in awake than in anesthetized males. In all animals, cortisol rose immediately and peaked within 30-60 min of injection. Whereas all 4 ACTH-treated cheetahs produced cortisol titers in excess of 200 ng/ml, only 4 of 14 electroejaculated males produced cortisol levels comparable to this concentration range. Neither testosterone nor LH profiles were affected by ACTH-induced elevations in cortisol.(ABSTRACT TRUNCATED AT 250 WORDS)