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Hopefully, your boy is carrying 2 copies. Boys can carry a single dose (B/b+) or a double dose (B/B). The light boys are carrying 2 copies. Darker boys (that look like girls) are only carrying one copy. You'll get better at judging that as you work with the barred birds. That said, it works differently if you are starting with a male B bird. Male with single dose of B on solid female will give you 25% B/b+ males (they will appear barred but are only carrying a single barred gene,) 25% B/- females, 25% each, male and female, of solid off-spring. But, if he is carrying a double copy of B (B/B) you will get ALL barred offspring (single dose) which will give you MUCH more to work with next generation. So here's hoping he is carrying the B/B you are looking for!!!!
Second generation barred to barred will then give you some B/B offspring.