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Also the two that don't express the gene should be bred together, you'll increase the probability of getting smooth feathered birds over shredded birds. You can then breed the successive generations until you have eliminated the recessive shredder gene. Takes time but the end result will be...

The shredder allele is attached to the lavender gene and will most likely be passed to each successive generation. I would outcross them to some good blacks and breed the F1 generation to each other to test. Use only the best birds with the best feather quality and cull the rest. This is a...

Agreed, it seems to be a simple recessive and if you breed birds that express the defective recessive trait all offspring will be carriers or phenotypical expressive for the trait.