Balancing between costs and benefits of maternal hormone deposition in avian eggs.

  title={Balancing between costs and benefits of maternal hormone deposition in avian eggs.},
  author={Ton G. G. Groothuis and Corine M. Eising and Cor Dijkstra and Wendt M{\"u}ller},
  journal={Biology letters},
  volume={1 1},
Avian eggs contain substantial amounts of maternal androgens, and several studies have indicated that these are beneficial for the chick. Nevertheless, there is a large and systematic variation in maternal hormone concentrations both within and between clutches. If maternal androgens also involve costs, this might explain why not all mothers put high levels of androgens in their clutches. However, the simultaneous occurrence of both benefits and costs has not yet been convincingly demonstrated… CONTINUE READING
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