OMIA 001731-9031 : Tail feathers, number of in Gallus gallus

In other species: rock pigeon , California condor

Mendelian trait/disorder: unknown

Considered a defect: no

History: Williams (1979) was the first to report some (bantam) chickens having eight rather than six tail feathers.

Inheritance: Williams (1979) postulated single-locus autosomal recessive inheritance, but with incomplete penetrance and variable expressivity. This evidence suggests that this trait is actually multifactorial. Somes (1990) lists this as a single-locus trait, with the symbol "ext".


Note: the references are listed in reverse chronological order (from the most recent year to the earliest year), and alphabetically by first author within a year.
1990 Somes, R.G. Jr :
Mutations and major variants of plumage and skin in chickens. In "Poultry Breeding and Genetics" (ed. R.D. Crawford), Elsevier, Amsterdam; Chapter 6 :169-208, 1990.
1979 Williams, R.L. :
The eight tail feather trait. American Bantam Association Yearbook :238-244, 1979.

Edit History

  • Created by Frank Nicholas on 13 Jul 2017
  • Changed by Frank Nicholas on 13 Jul 2017