期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 269, 期 1493, 页码 823-829出版社
ROYAL SOC
DOI: 10.1098/rspb.2001.1954
关键词
testosterone; oestrogen; paternal behaviour; aromatase
资金
- NIMH NIH HHS [F31 MH064328, MH64328-01] Funding Source: Medline
Although high testosterone (T) levels inhibit paternal behaviour in birds breeding in temperate zones many paternal mammals have a very different breeding biology, characterized by a post-partum oestrus. In species with post-partum oestrus, males may engage in T-dependent behaviours such as aggression and copulation simultaneously with paternal behaviour. We previously found that T promotes paternal behaviour in the California mouse, Peromyscus californicus. We examine whether this effect is mediated by the conversion of T to oestradiol (E-2) by aromatase. In the first experiment, gonadectomized males treated with T or E-2 implants showed higher levels of huddling and pup grooming behaviour than gonadectomized males treated with dihydrotestosterone or empty implants. In the second experiment, we used an aromatase inhibitor (fadrozole) (FAD) to confirm these results. Gonadectomized males treated with T + vehicle or E-2 + FAD showed higher levels of huddling and pup grooming behaviour than gonadectomized males treated with T + FAD or empty implants. Although E-2 is known to promote the onset of maternal behaviour to our knowledge our results are the first to demonstrate that E-2 can promote paternal behaviour in a paternal mammal. These results may explain how mammals express paternal behaviour while T levels are elevated.
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