Genetics of the columbian plumage pattern in the Vasca chicken breed

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Abstract
In studies of the genetics of plumage color of Vasca, a Spanish breed of chickens with gold columbian restricted pattern, results of crosses between recessive tester wheaten (ey/eyco+ / co+) with Vasca and F1 from a Castellana × Vasca cross showed that a wheaten allele is the most frequent at the E-locus in Vasca chickens. Crosses between Vasca and light brown Leghorns (e+ / e+co+ / co+) or brown (eb/ebco+/co+)tester lines showed that the wheaten allele was the dominant one (ewh). These crosses, and the analysis of chick down in pure Vasca populations, suggested that the wild-type (e+) and brown (eb) alleles also are present at low frequencies. Since Vasca is a new breed, created in 1975, this heterogeneity would be expected. The dominant wheaten allele seems to interact with the dominant columbian restriction gene Co, resuiting in the characteristic plumage of the breed. The columbian-type dark brown gene (Db) does not appear to be present in this breed.

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