BIG MED that link to the calculator is great! Thank you for the link.
I sat here and looked at it for an hour.. not sure IF I learned anything. lolol
I use to learn from just trying small test hatches. It costs me about $14 to grow out a bird to HOPE to see any Red Leakage or lite eyes and other effects that are undesired.
I had a boy chick last spring from an Exhibition line Buff Orpington pullet and a Black Australorp cockerel from Mt Healthy Hatchery. The cockerel had some good traits that the Buff did not (tail). I was new to chickens, and was told that fertility MAYBE an issue with the pullet. So, I took the Australorp to the Buff pullet. Had a great Orpington type cockerel who looked like a creamy off white with charcoal smeared all over. The markings did not detour me. This cockerel is 11 lbs at 11 months old. Once I had a hen ready I threw it in with him. I took a Blue Splash to him as well. Had 2 eggs hatch. Both are Black. One does have Red Leakage and one looks like a great quality PURE Black Orp boy, who, at 3 months old, does not have any Red Leakage, his eyes are going to be dark. So, I say throw everything at em. Worse case is you get a fluffy meat bird.