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Gonadectomy in Relation to the Secondary Sexual Characters of Some Domestic Birds -By H.D. Goodale

Gonadectomy in Relation to the Secondary Sexual Characters of Some Domestic Birds -By H.D. Goodale


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916. Excerpt: ... GONADECTOMY IN RELATION TO THE SECONDARY SEXUAL CHARACTERS OF SOME DOMESTIC BIRDS.1 INTRODUCTION. It has been long known that an intimate relation exists between the primary sexual organs of certain.animals and their secondary sexual characters. Until recent years, however, there has been considerable doubt as to the interpretation of many of the effects of castration--i. e., as to whether the effect tended toward the appearance of characters belonging to the opposite sex. In particular, there has been a dispute as to whether certain characters, such as the small comb of the capon, were to be considered juvenile or female. In birds the occurrence of individuals with the plumage and other characters of the male, but having the sexual organs of the female, have attracted a great deal of attention. Recently, Guthrie (1910) has described a hen with male plumage following ovariotomy, while Fitzsimons (1912) has reported like results in the ostrich. Very often, and perhaps always, the records state that the ovaries of male-plumaged females occurring in nature have degenerated to a greater or less degree, and from this it has been inferred that the occurrence of the male plumage was in some way or other associated with the degeneration of the ovary. On the other hand, the sporadic occurrence of birds with the external characters of the female and the internal sexual organs of the male is relatively uncommon in races such as pheasants or domestic fowl. As a rule such males, whose primary sexual organs are perfectly normal, exhibit only one or two female characters, the remainder of their secondary sexual characters being those of the normal male. Female characters may also be normal to the juvenile male. Moreover, it has been shown in the case of henfeathered mal...


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Product Details
  • ISBN-13: 9781154555271
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1154555275
  • Publisher Date: 19 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 64 gr


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Gonadectomy in Relation to the Secondary Sexual Characters of Some Domestic Birds -By H.D. Goodale
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