Environment modifies the testosterone levels of a female bird and its eggs.

@article{Schwabl1996EnvironmentMT,
  title={Environment modifies the testosterone levels of a female bird and its eggs.},
  author={Hubert Schwabl},
  journal={The Journal of experimental zoology},
  year={1996},
  volume={276 2},
  pages={
          157-63
        }
}
  • H. Schwabl
  • Published 1 October 1996
  • Biology
  • The Journal of experimental zoology
Past studies have shown that the yolk of the canary (Serinus canaria) egg contains maternal testosterone, that its concentrations increase in the subsequently formed eggs of a clutch, and that testosterone influences development. The present study investigated 1) if the testosterone levels vary in the female during yolk formation; 2) how such putative variations may be related to the concentrations of maternal testosterone in the yolk; and 3) if environmental factors, such as day length, can… 
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Environmental effects on steroid hormone concentrations in laying hens’ eggs
TLDR
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TLDR
Results indicate a significant decrease in A and T during embryonic development, similar to that reported by the laboratory for the alligator, with A levels being significantly greater initially than levels of all other hormones.
Patterns of yolk testosterone deposition in two populations of Arctic-breeding Redpolls
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Yolk androgens reduce offspring survival
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