Perhaps some lines of White Minohiki are just the RSD^Y factor homozygous and selected for a pure white expression in combination with Silver pheomelanin and the Inhibitor of Autosomal pheomelanin thus making the self-white phenotype. Heterozygote state, but can be selected into a pure white expression that replaces eumelanin with visual white but not the pheomelanin, as we see in the Red Shouldered Yokohamas. That this gene is in fact a eumelanin diluter that creates “splashing” in the and White Yokohama and many other lines of white fowl, and Likely that the white birds that carry this trait also carry mottling, as we Some have felt this is a type of mottling, but it is more Shouldered Yokohama and White Yokohama (which also frequently carries thisįactor under the recessive white, just like the white Minohiki seems to) is aĭirect descendant of Japanese Minohiki. This factor has also apparentlyīeen extracted from some white Minohiki, which is no surprise, as the Red In addition to Red Shouldered Yokohama, I have alsoĮxtracted this gene from White Yokohama and White Sultans (though all White Yokohamas and White Sultans I have worked with do not have this factor). Loosely as “silver” or “silvering factors”. All of these described forms of “white”Īre based on pheomelanic pigment inhibition/dilution and are thus referred to Together with S, then the effect will be a very clean “white” silver Columbian Homozygous, without the presence of Aph^I. ColumbianĬan suppress the expression of Aph and Mh on the body of the bird when S is Stronger effect, especially when S (sex-linked silver are present). Db has a stronger interaction with Aph,īut when Co and Db are together on the same bird, Co will tend to have a Co has a strong repression effect on Aph and Mh and interacts most Columbian (Co) and Darkīrown (Db – ginger) both work with pheomelanin to extend it into eumelanicĪreas. Both areįrequently extracted from clean “white” silver lines. The two recognizedįactors involved in this function are Dilute (Di) and cream (ig).

In addition to these two major genes, dilutionįactors contribute to the cleanest white silver forms. All of her plumage is cool tones with no warm tones, which is the hallmark of Inhibitor of Autosomal Pheomelanin expression. Note the absence of any salmon tones in the breast. A silver duckwing Phoenix hen showing expression of the Inhibitor of Autosomal Pheomelanin.

Brian reeder