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Leghorns are far, far, far from my specialty, but if the white also has the genes for light or dark brown under the white, red would show in the first generation as the offspring would only have one copy of white.
This is quite possible. I've been trying to find out what colors white...
Leghorns tend to be dominant white, so all of your first generation would be white, but breeding siblings together could produce some BBS birds. Who are you planning on using for the blue parent?
You could probably achieve your goal in a few generations with blue andalusians. Are there no blue...