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Some observations on high cavernous nostrils in the chicken.

R G Somes1

  • 1Department of Nutritional Sciences, University of Connecticut, Storrs 06269-4017.

The Journal of Heredity
|March 1, 1991
PubMed
Summary

Cavernous nostrils in chickens are linked to the V-shaped duplex comb trait, specifically the Dv allele. This genetic trait appears to be a pleiotropic effect related to comb size reduction.

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Area of Science:

  • Animal Genetics
  • Poultry Science
  • Morphological Genetics

Background:

  • Nostril shape in chicken breeds varies, with cavernous nostrils associated with V-shaped duplex combs and slit-type nostrils in others.
  • The Sicilian Buttercup breed, featuring a buttercup-type duplex comb, exhibits slit-type nostrils.

Purpose of the Study:

  • To investigate the genetic basis of cavernous nostrils in chickens.
  • To determine the inheritance pattern of nostril morphology in relation to comb type alleles.

Main Methods:

  • Crossbreeding experiments involving Sicilian Buttercup, La Flèche, and single comb chicken breeds.
  • Analysis of nostril morphology and comb type in offspring to infer genetic linkage.

Main Results:

  • Cavernous nostrils are a pleiotropic effect of the Dv allele at the duplex comb locus.
  • The Dv allele is inherited recessively when crossed with the wild type (d+).
  • The buttercup allele (Dc) modifies the expression of the Dv allele, leading to dominant inheritance of mutant nostrils in specific combinations.

Conclusions:

  • Cavernous nostrils are proposed to be a pleiotropic effect of the comb-size-reducing function of the Dv allele.
  • The genetic interaction between Dv and Dc alleles influences nostril morphology in chickens.

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