That was some years ago, and no, i had no 'special instructions' as to caring for them any differently than the white rocks. That was pre-internet days, info wasn't at the tip of our fingers then. I didn't find any info on that until the problems had already started...THEN the feed store guy told me, well, sometimes you have to be careful feeding too much with those! They didn't mention it when I bought them, and I didn't ask because I didn't know to. I had never heard of them before that. I did ask how they compared to the white rocks, they just said they are supposed to grow bigger faster. Sounded good to me. I didn't even know I shouldn't try to keep any pullets...with the rocks, I alwyas bought straight run, butchered the cokcerals, kept the pullets for layers. I didn't know you couldn't do that with the cornish. As to limiting feed to 12/12, no, but then, I did not have any of them under lights, so they wouldn't have been eating 24 hrs, plus, I did not, even with the white rocks or any other chicks i raised, beyond the first several weeks, keep full feeders in front of them constantly. They eat their fill, start wasting it from that point. They were offerred what they would clean up in a reasonable time several times a day, like I did with any chicks. Specialized broiler raisers might have raising them down to a fine art. Maybe knowing more now, if I needed to raise meat as economically as possible, might try. I don't, so I won't, lol. i just chalked the whole mess off as a lesson learned. No more CornishX for me.