Just because they hatch out black doesn't mean that they will be black inside and out, especially with them having been crossed or breed for egg production. They might be big enough that you can look inside their mouths and see if they are black inside, also you can check skin color under the wing, and also check the vent and should be able to see that it is black inside and not pink. Plus as they get older, some of the cockerel's may get red or a pinkish red in their combs, and waddles as they get older, even though they are black at the moment. Especially the ones that are light skin or the ones that might have a white feather here and there."He had 3 jet black ones for me but they got stolen before he could send them.
With these, I should get 25% jet black, 25% white and 50% grey. But because he bread them for egg production and not so much color I should get an egg per day from each of my four hens. So, by the numbers, in a perfect world, I should get 1 jet black cemani per day. "
Where did you get the percentages/numbers from?
My advice is when you are able buy at least the best and blackest rooster you can, breed it into that line and cull as heavy as you possible can. Only keep the blackest ones, I would not keep any that the skin is not black, the inside of the mouth is not at least gray, and so on. Then take the best pullets that you kept and cross back to their dad and cull hard again really hard.
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