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Sexually dichromatic shank melanization associated with the birchen (E R ) allele.

Abstract Sexually dichromatic variation in shank melanization, similar to that described in Barred Plymouth Rock chicks, was observed in the absence of sex-linked barring (B) in black-down birchen (ER) chicks. The shanks of male chicks are uniformly pigmented. The female chicks have more darkly pigmented shanks, and pigmentation is frequently restricted in the distal portion of the shank and toes. Among chicks definitely demonstrating the male or female phenotype, 80.2% were accurately sexed. An intermediate shank type was observed in 35.1% of the total number of chicks, and these were sexed with 55.9% accuracy. A total of 71.7% of the birchen (ER) chicks were accurately sexed on the basis of shank color alone. This accuracy in sexing is similar to that observed in Barred Plymouth Rock chicks.