Journal of Genetics

, Volume 39, Issue 3, pp 517–524 | Cite as

The endocrine system and plumage types

V. The production of eclipse plumage in the mallard by injection of anterior pituitary extract and dehydroandrosterone
  • J. P. Chu


Large doses of sheep pituitary extract produce eclipse plumage in mallard drakes prior to the normal eclipse season. This assumption of eclipse plumage is associated with hypertrophy of the testis.

Administration of 5 mg. oftrans-dehydroandrosterone daily will cause the growing feathers to assume an eclipse type in young male and castrated mallards.


Oestrone Black Pigment Injection Period Feather Sample Eclipse Phase 
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Copyright information

© Indian Academy of Sciences 1940

Authors and Affiliations

  • J. P. Chu
    • 1
  1. 1.National Institute for Medical Research, HampsteadLondon

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