Abstract
Estrogen and androgen radioimmunoactive substances were measured throughout development in whole body homogenates of the flesh fly Sarcophaga crassipalpis. Estradiol-equivalent substances (EES) (range of 1–9 pg/mg protein) and testosterone-equivalent substances (TES) (1–17 pg/mg protein) were present throughout larval and pupal development, during pupal diapause, and in both male and female adults. Males and females of each age contained nearly the same amounts of EES and TES, thus suggesting that these steroids are unlikely to contribute to sexual differences. A major increase in EES and TES was detected in both males and females on day 3, a point coinciding with the onset of mating. High levels present in these ovoviviparous females during the last half of the reproductive cycle may be due partially to the embryos within her uterus since very high amounts of both steroids were detected in first instar larvae dissected from the uterus.
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