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1 Department of Animal Science,
Agricultural Experiment Station, College of
Veterinary Medicine, University of
Tennessee, Knoxville, Tennessee
2 Department of Dairy Science, University
of Illinois, Urbana, Illinois
Plasma and semen concentrations of androgens and progestins were not influenced by
repetitive ejaculation in bulls. Within 20 minutes after the injection of testosterone (100 mg
Intravenously), plasma concentration of androgen (mean ± SEM) was 698 ± 240 ng/ml (92%
testosterone) and semen concentration of androgen was 27.7 ng/ml (76% testosterone). Within 20 minutes after the injection of progesterone
(100 mg intravenously), plasma concentration
of progestin was 2226 ± 635 ng/ml (96% progesterone) and semen concentration of progestin was 68.2 ± 2.2 ng/ml (68% progesterone).
Thereafter, the concentrations of androgens
and progestins in both plasma and semen
steadily declined. Semen/blood concentration
ratio values for progestins and androgens were
similar to each other during the experimental
period. It was concluded that testosterone and
progesterone were readily transferred to the
ejaculate from the blood.
Key words: progesterone, testosterone, blood, semen, ejaculated
Submitted on December 15, 1980
Revised on March 16, 1981
Accepted on March 18, 1981
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