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Local Increase in Testosterone Concentration in the Testicular Artery in Rams¹

University of Wisconsin³, Madison 53706

Abstract

Plasma testosterone concentrations were measured in blood from the testicular artery and intestinal artery in five rams. The concentration of testosterone was an average of 15.1% higher (P<.05) in the testicular artery (6.4 ng/ml) than in the intestinal artery (5.7 ng/ml). In a second experiment with seven rams, the concentration of testosterone was an average of 11.5% higher (P<.05) in the testicular artery (4.3 ng/ml) than in the abdominal aorta (3.8 ng/ml). Results are consistent with the hypothesis of a venoarterial pathway involving the testicular artery and the venous pampiniform plexus in rams.

¹ Research supported by the College of Agricultural and Life Sciences, University of Wisconsin and by Grant No. 630-0505A from the Ford Foundation and by Public Health Service Training Grant No. 5-T01-HD-00104-08. The authors thank Mr. William Steffenhagen for assistance in surgery.

² Trainee, Endocrinology-Reproductive Physiology Program, University of Wisconsin, Madison.

³ Department of Veterinary Science.