Effect of Elevated Ambient Temperature on Testis and Blood Levels and In Vitro Biosynthesis of Testosterone in the Ram

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Abstract
Thirty-four yearling rams were subjected to Ohio spring conditions (control) or elevated temperature for 2 weeks in a temperature controlled room (treated). Rams had significantly smaller testes after heat treatment, compared to controls. Concentration of testosterone in testis tissue was 1.09±0.52 µg/g dry wt. for controls, but only 0.35±0.15 µg/g for testes from treated rams (P<.05). Similarly, spermatic venous blood testosterone decreased (P<.05) from 8.2±4.4 to 1.9±0.6 µg/100 ml plasma following treatment. Testis tissue from treated rams also incorporated less labeled precursor (cholesterol and pregnenolone) into testosterone in vitro than tissue from control rams. Copyright © 1971. American Society of Animal Science . Copyright 1971 by American Society of Animal Science.

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