Ok if you are going to lightening pieds the best way to do it is to take a pied breed it to an axanthic. All of the offspring from THAT breeding will be double het for lightening pied. Then take those offspring raise them up and breed them together to get the 1 in 16 chance of getting the desired results. There is no need to "prove" out either of the hets because you produced them so you know that they have the genes. End of story.
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