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Testosterone and "5alpha-dihydrotestosterone" levels in peripheral plasma of male and female ring doves (Streptopelia risoria) during and reproductive cycle.


 Peripheral plasma levels of testosterone (T), 5alpha-dihydrotestosterone (DHT), and androstenedione (A) were determined in paired male and female ring doves (Streptopelia risoria) throughout the reproductive cycle. Before pairing, plasma levels of T and DHT in males were 183.4 + or - 28.1 pg/ml and 129.5 + or - 16.3 pg/ml, respectively. 4 hours after pairing with a female, mean levels of T and DHT in males had increased by 1.76 and 8 times over basal values, respectively. 3 days after pairing, T and DHT levels peaked at values 3.8 and 9.9 times those of prepairing levels, respectively. However, once the female laid her 1st egg, T and DHT levels fell to 189.6 + or - 26.1 pg/ml and 200 + or - 41.9 pg/ml, respectively. Androgen levels did not increase thereafter until the next courtship phase. Androstenedione levels consistently remained below 10 pg/ml. T and DHT levels in females showed a slight increase during courtship, but these levels were always lower than those in males at all phases.
