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When you say Cornish Rocks in the freezer at
Walmart, do you mean the little Cornish-Rock game hens? If so, those are the same as the full size supermarket chickens, just butchered younger. Like 3 or 4 weeks, I think. As others have posted, those are the result of intensive breeding with 4 parent lines for a long time, it's not what you get crossing a Cornish and a Rock at home. That said, crossing a Cornish and a Rock at home will give you a perfectly acceptable meat bird, if you don't expect the same growth rate as the meat crosses from the hatcheries.
To have a Cornish-Rock cross, of course it has to be part Cornish and part Rock. What you have is an Orpington/Rock cross. I suggest you don't get rid of the Cornish until you butcher an Orp/Rock, eat it, and see what you think. You may have come across a mix that will be great for what you want. You might also try your DC roos over the Orp and rock hens, and see what you get that way. I bet you'll like what you get with at least one of these crosses. Or DC roo over an Orp/Rock hen. You could call them Cornish Rockingtons. Cornoprocks? No, that sounds like a porn film.
You could be onto a great mix here, if you give it some time, and see which ones you like the best.
I wish we lived closer, I'd be happy to take some DC's off your hands, if you decided you didn't want them.
On posting pics: It's kind of a PITA, for me, because I'm on dial-up, and it takes forever. But what you have to do is post your pics on Photobucket or a similar photo storage site. Then you can load that site and BYC in different windows, or different tabs. I like tabs, myself. You click on the pic in photobucket, and wait for the page to load the larger image. Then you right click on the pic, select "copy image location". Switch back to BYC, (on which you'll be in the process of posting, I forgot to say that)
Above the box where you write your message, click the "img" button. That will put
on your screen. You right click between the 2 center brackets, click "paste" . That should add the image location between the brackets. After you click "submit", you should see your pics, and see if it worked ok. You can also use the preview button, but I hardy ever do anymore.