If you breed Cornish X brother to sister, you will get some clones. However, you need to feed them just once a day and control the amount they eat. This is esier sad than done.
I have a cornish x /Breese cross line that I developed for meat. It takes them 3 months to reach an average weight of 5.50lbs dressed and they live normal lives.
The Breese/Cornish x crossed rooster I kept for breeding hit 12lbs at 4 months old. I put him and his 2 sisters on a diet of 3/4 pint mason jar of feed once a day and once they lost some weight, I fed them the same amount twice a day. I don't like to see any left over feed because I don't want the birds to hang around. I have been collecting eggs daily from these two sisters, so they are decent layers and their off spring make good fryers at 3 month old. The blue legged ones turn out to be better layers and the yellow legged tend to get bigger. At first I was selective breeding for white legs, but my project got put on hold when my freezer filled up. I still need to breed my 12 lbs rooster back to his white legged daughters to lock it down.
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