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Effect of Elevated Ambient Temperature on Lipid Levels and Cholesterol Metabolism in the Ram Testis

The Ohio State University and Ohio Agricultural Research and Development Center, Columbus²

Abstract

Twenty-seven yearling rams were subjected to elevated temperature for 0 (control), 1 or 2 weeks in a temperature controlled room. Testis weight decreased with increasing length of exposure time and histological sections showed progressive degeneration. Total lipid, triglyceride and total and free cholesterol concentrations increased after 1 week of treatment but returned to control concentrations after 2 weeks. Total amounts of all lipid components, except esterified cholesterol, decreased as testis weight decreased.

In vitro incorporation of sodium acetate-1-¹⁴C into esterified cholesterol, esterification of cholesterol-4-¹⁴C and catabolism of cholesteryl-4-¹⁴C-stearate were all increased by heat treatment. Testis tissue from treated rams catabolized cholesterol-4-¹⁴C more slowly in vitro than that from control rams.

¹ Present address: Department of Animal Science, University of Georgia, Athens.

² Contribution from the Animal Reproduction Teaching and Research Center and Department of Dairy Science. Journal Article No. 13–69.