EFFECTS OF THE AROMATASE INHIBITOR R76713 ON SEXUAL DIFFERENTIATION OF BRAIN AND BEHAVIOR IN ZEBRA FINCHES by JACQUES BALTHAZART1), PHILLIPE ABSIL1), VERONIQUE FIASSE1) and GREGORY F. BALL2,3,4) (1Laboratory of General and Comparative Biochemistry, 17 place Delcour, University of Liège, Liège, Belgium and 2Department of Psychology, Johns Hopkins University, Bal- timore, MD 21218, USA) (With 5 Figures) (Acc. 19-IX-1994) Summary Neonatal estradiol injections masculinize both the singing behavior and some morphologi- cal aspects of the song control nuclei in female zebra finches (Taeniopygia guttata), but there is to date no physiological evidence that estrogens are responsible for the differentiation of song and the song control nuclei in male zebra finches during normal ontogeny. Injections of estrogen into young males demasculinizes their copulatory behavior, so that it is difficult to understand how the same endocrine environment could simultaneously masculinize song and demasculinize copulation. Attempts to block early estrogen action in males have resulted in a paradoxical hypermasculinization of several aspects of the song control nuclei. In the present experiment, we tried to evaluate the role played by estrogens during zebra finch differentiation by blocking their secretion with the non-steroidal aromatase inhibitor, R76713 or racemic vorozole. Zebra finches received at 2-3
Behaviour – Brill
Published: Jan 1, 1994
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