Influences of sex, castration, and androgens on the eumelanin and pheomelanin contents of different feathers in wild mallards.

@article{Haase1995InfluencesOS,
  title={Influences of sex, castration, and androgens on the eumelanin and pheomelanin contents of different feathers in wild mallards.},
  author={Eberhard Haase and Shosuke Ito and Kazumasa Wakamatsu},
  journal={Pigment cell research},
  year={1995},
  volume={8 3},
  pages={164-70}
}
In mallards the bright nuptial plumage of the drake represents the neutral, sex hormone-independent coloration of the species that both sexes eventually exhibit after castration. We compared the pheo- and eumelanin contents of feathers from the head, breast, flank, and under-tail coverts in five groups of mallards after the post-nuptial molt in summer: intact hens, intact drakes, castrated drakes, castrated drakes injected with testosterone during the spring, and castrated drakes injected with… CONTINUE READING

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