Abstract
Crosses of Rouen and White Pekin ducks produced a new black color pattern, which was distinct in the down of the ducklings and the plumage of the adults. Restricted and Mallard color patterns were also evident as well as a dusky pattern at a very low frequency. The results indicate that black (MB) is allelic to restricted (MR), Mallard (M), and probably dusky (md) with the existence of a quadruplet allelic series in the following order of dominance: MB>MR>M>md.
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