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I plan on keeping her and breed back to buff.
Maybe to black too as a test.
What cross do you propose?
Can we rule out the fact it is just leakiness (enhanched by het buff genes...) on dominant white???

Well, if it IS a mutation on dominant white locus, so I think, to start with, it would be best to test it on pure black birds, to see what it can do to them. Dominant white works predominantly(as far as the colour is concerned)on eumelanin.

Will certainly do Wieslaw.
I assume i could use an exchequer or blue cock also...
But crossing is for a few months from now when she matures.

Has anybody seen this colour before?
Can dominant white look like this?

>Father is buff, only buff hens in the pen except the suspected mother is totally white production leghorn. Full brothers to the chick are white (leaking buff) with yellow legs.
Hatch down was white.

Update:
The pullet that started this tread has still the same colour.
One brother is white with buff in the shoulders/wings.
The other brother has more buff in the neck and chest; only white in tail, belly and part of the wings...

A few days ago I hatched a new chick from the same pen with the same off coloured legs and the grey already showing in the chickdown.
It is not shiny white but grayish (as seen in some recessive white chick down-but I assume this is not the case here)

What does this say about there genotype?
Would the difference in the males be caused by the dominant white mother being het for melanisers? (ML)

2 photos of the new chick

The grey one in the middle. The other appear what would be expected for buff and buffxdominant white chicks...

It may appear like you may have a new mutation on I-locus. In my opinion melanizers would not make a big difference. It is often written that white Leghorns are on E, and you can practically never rule out the presence of melanizers in black birds.

Hi Wieslaw,
Why I mentioned the melanisers is the difference in fenotype in the 2 brothers.
1 is mostly white with buff wings.
The other is mostly buff with white tail.
I assumed the white one is more melanised and the black parts turned into white by I.

Maybe the buff father is het on the black restrictors needed for buff or the I mother is het for melanisers?

I don't know if she is E or E^R but E^R was found in (white) leghorns....

Yes, I know, but there are so many postings on this forum where people wrote white Leghorns were on E (too). I wonder how did they know it.