Porcelain and self blue both carry the lavender gene. The self blue contain genes that would normally (no lavender genes) make a bird black. The genes that make the bird black are usually dominant over the genes that would make a bird millie fleur (the colors that are a part of the porcelain variety) so you will wind up with blue birds that show some cream/buff on the breast, head and hackles.
If the self blue bird carries one mottling gene (it takes two mottling genes to express mottling), then some of the chicks will express mottling.
Tim
If the self blue bird carries one mottling gene (it takes two mottling genes to express mottling), then some of the chicks will express mottling.
Tim
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