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- W2036695841 abstract "In three experiments, we investigated whether testosterone itself or its metabolites activate aggression and dominance in white-throated sparrows Zonotrichia albicollis. Groups of five to six sparrows, each treated with a different steroid implanted subcutaneously, were observed in outdoor aviaries during late winter to determine the birds' rates of aggression (supplantations and attacks scaled to the number of available subordinates) and dominance rankings with opponents not previously encountered. In Experiment 1, testosterone (T) had a greater effect on aggression and dominance than did androstenedione, 5 alpha-dihydrotestosterone (D), androsterone, or estradiol (E). In Experiment 2, birds with T or D + E had higher aggression scores and dominance ranks than birds with either D or E alone. Birds with T and D + E did not differ. The testosterone metabolites, D and E, thus acted synergistically to determine rates of aggression and dominance ranks. To corroborate these results, in Experiment 3 we treated T-implanted birds with the following blocking agents: ATD, expected to reduce conversion of T to E (AT birds); progesterone, expected to reduce conversion of T to D (PT birds); or both (APT birds). The APT birds had lower aggression scores and dominance ranks than did AT or PT birds, despite having higher mean levels of circulating T than AT or PT birds or birds implanted with T alone. Cyproterone acetate also reduced aggression scores and dominance in T-implanted birds. We conclude that the hormonal control of aggression and dominance in these birds requires conversion of testosterone to both androgenic and estrogenic metabolites." @default.
- W2036695841 created "2016-06-24" @default.
- W2036695841 creator A5085487337 @default.
- W2036695841 date "1988-12-01" @default.
- W2036695841 modified "2023-09-24" @default.
- W2036695841 title "Control of aggression and dominance in white-throated sparrows by testosterone and its metabolites" @default.
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- W2036695841 doi "https://doi.org/10.1016/0018-506x(88)90054-2" @default.
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