TomCahalan
Songster
and leakage is considered a bad thing in white ducks so those with leakage are usually not bred
Leakage is bred out of white ducks, but maybe non-white ducks would have the desired genes in there somewhere. So you'd want to start with a bunch of random ducks of various breeds to get raw genetic diversity, and then breed white into them, trying to minimize white ancestry in the mix. I doubt it would be possible in a reasonable time frame, but that's the approach that I would use.