Yolk testosterone stimulates growth and immunity in house finch chicks.

@article{Navara2006YolkTS,
  title={Yolk testosterone stimulates growth and immunity in house finch chicks.},
  author={Kristen J. Navara and Geoffrey R Hill and M. J. T. de Mendonca},
  journal={Physiological and biochemical zoology : PBZ},
  year={2006},
  volume={79 3},
  pages={550-5}
}
Female birds deposit variable amounts of androgens, such as testosterone, into the yolks of their eggs. Evidence suggests that yolk androgens play an important role in the determination of offspring phenotype. While androgens are generally regarded as anabolic and immunosuppressive, studies of the behavioral and physiological effects of yolk androgens on offspring of several avian species have been conflicting, leaving the adaptive significance associated with deposition patterns of yolk… CONTINUE READING

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Yolk androgens reduce offspring survival

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