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I suppose I don't know for sure what color it was, but the current Cornish Cross are definitely white, and I've never heard of "Cornish Cross" in any other color. Chickens with white feathers have white pinfeathers, which do not show as much if you miss a few when plucking the chicken. White...

The other line must be red, to make the color-sexing come out right for the end product. It might just be another line of Rhode Island Red or New Hampshire. Given how brown the eggs are from some ISA Browns, I would not expect to find any Leghorn in them (at least, not recently-introduced...

To make CornishX (also called Cornish Cross, or Rock Cornish Cross, or other variations of those names): Originally, decades ago, White Plymouth Rock hens bred with White Cornish roosters. The hybrid chicks grew fast and had big breasts (as compared with other chickens available at the time.)...

What would you expect? I would expect two lines (maybe A and B) are all white (Silver plus Dominant White). I would expect the other two lines (C and D) to be red (like Rhode Island Reds or New Hampshires.) They might have a fast-feathering and a slow-feathering line of each color, so when...

Pretty close, yes. What they probably really did: Breed white hens and red roosters, raise a bunch of daughters, keeping track of which daughters came from which parents. See how well the daughters lay. Take the white hens and the red roosters that produced the very best daughters, and breed...

It doesn't even have to be a secret, if they just refuse to sell any of the pure lines (A, B, C, D). Making color-sexable chicks is pretty easy. Making ones that lay as well as ISA Browns is not nearly as easy. That takes a lot of careful breeding work. If you want color-sexable chicks, you...