Relationships of Testicular Cholesterol to Hormonal Activity and Behavior in the Starling.

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Abstract
Levels of cholesterol were determined in testes of starlings collected from all portions of the gonadal and behavioral cycle. The lowest concentration of cholesterol was observed during recrudescence of the testes and at the time of most active behavior. The highest concentration was observed during regression of the testes and at the period of lowest behavioral activity. Intermediate concentrations of cholesterol accompanied the moderate behavioral activity observed in the fall and winter. An hypothesis relating cholesterol concentration, hormone production and behavioral activity is advanced.