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No, a cornish is one breed.
White rock is another.
A cornish-x or a cornish-rock is a specialized cross between the two breeds (I think the cornish has to be the rooster if I remember right...).
With specially selected birds, this cross produces birds for meat that grow at a ridiculously fast rate and get quite huge. I grew out about 15 birds last year to try it out. AMAZING growth rate.
I fed the entire time with the meat chicken ration sold at Farm and Fleet. Mine had feed in front of them 24/7, but I've since learned that that is being wasteful, because after a certain amount of food, their bodies aren't using it to grow anymore, they are just converting it directly to poop, and that by removing the food at night, they will still grow just as big - and cost me less to feed. Sounds like a good plan, and I'll be trying that this time. Plus, it will be less likely to draw rats and mice that way.
Last year, we had ours processed at 8 weeks and I weighed each bagged chicken when it was done. They were between 4.5 and 7.5 lbs. after processing, and they were delicious.
This cross has been developed to eat. If you
don't process them between about 6 & 9 weeks, the majority of them will get so big that their legs will no longer support them and /or they will die of heart attacks. There's always someone out there that had a cornish-x for years and years that layed eggs for them and was the best chicken ever. But that's not the norm. Also, not just any old cornish/rock cross will produce a good meat bird. Hatcheries are using stock that they have tested and developed over many, many years.
It's a whole different ballgame than raising laying birds. I found it strange too, so I did all kinds of looking things up and asking questions before I gave it a try. It just seems weird that it would be so different, but it is. I was also afraid that it would be too hard for me to have them processed, but by that time, they were so big and gross and stinky that I was actually glad to see them go. Besides, I knew that they were going to die one way or another. So it was easier to do than I had expected. This year I'm going to do 30 birds.