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this kina assumes you are starting with pure birds and not a 15/16 mutt someone sold with out being honest this also assumes that all birds are fertile and everything goes exactly right , My little part of the world Never goes this well so if everything dose not go perfectly...
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Not sure if I can remember all the way back to math class:
Red Golden X Lady Amherst cross= generation 1 is 50% (1/2)
Red Golden X 50% hen= generation 2 is 75% red golden (3/4)
Red Golden X 75% hen= generation 3 is 87.5% red golden (7/8)
Red Golden X 87.5% hen= generation 4 is 93.75%...