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The Journal of Heredity 1978:69(2):91-96
© 1978 The American Genetic Association 69:91-96

research-article

Ear-tufts: a skin structure mutation of the Araucana fowl

RALPH G. SOMES, JR.

The author is affiliated with the Nutritional Sciences Department, University of Connecticut, Storrs, Connecticut 06268

Abstract

The ear-tuft trait of Araucana chickens is described and genetic data are presented suggesting that it is caused by an autosomal dominant gene to which the symbol Et has been assigned. The main phenotypic expression of this gene is the development of feather-covered peduncles projecting from the head in the area of the ear opening or the ear lobe. Secondary manifestations of the gene result in modifications of the external auditory canal and lead to prenatal death of all homozygotes and of about 20 percent of the heterozygotes. Expressivity of the trait is quite varied, with approximately 25 percent of the birds having larger tufts on the left side, 25 percent having larger tufts on the right side, 25 percent with large tufts on both sides, and 25 percent with small to medium sized tufts on both sides. Also, penetrance is incomplete.


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