Does is matter which parent is the Cornish for the cross broilers? Cornish rooster, Rock hen, or Rock rooster with Cornish hen, or does it not matter? I already have my chickens for this year, I have two Cornish roosters and six rock hens. I know what can happen when you assume, but I figured that a rock lays a bigger egg, so the chicks would be bigger at the hatch. I guess I should have asked this last year, but I'm not doing this for a living, I will get by. Just asking for future years.