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Those birds are a special hybrid, made by breeding Cornish to White Rocks (I think) and the chicks don't breed true. The parent birds are back at the ranch breeding & laying fertile eggs. All the eggs are hatched, all the chicks are raised for meat. The parents are carefully selected stock that produce chicks who grow at an incredible rate, in just 8 weeks they are big enough to eat.
The females might be slightly smaller than the males at that age, but not enough to make a difference. I guess it's like the turkeys that are raised for meat, the bigger ones you find at the store are probably the toms, the smaller ones the hens.
I don't know if they're sexually mature at that age, if they would lay or crow or try to mate. Or maybe they're really just big beefy chicks, not sure if they're male or female yet. They're all processed together the same way.
There was a great article in Backyard Poultry extolling the excellent quality of older laying hens as meat for soup or stew. The article said that older birds have a rich flavor many of us have never tasted, being used to eating these really young chickens instead.
Except that cornish rocks are more than a cornish roo and a white rock hen. Its at least a 4 way cross with specific strains of Cornish and Rocks. I am assuming they have also bred their cornish parent stock to be single combed, In all the cornish x pics I have seen, I have only seen one pic that I saw a pea combed bird in. Yes, old hens do have a lot more flavor than a 8 week old broiler.