Cornish Hen is bred from the Cornish, usually bantam and in most cases for the meat market is crossed a white rock. This gives good development of size from the rock and good development of breast from the cornish. There is a specific way of breeding to get the required growth.
Producers keep there breeding programs closely guarded.
I breed cornish myself and they are fantastic meat birds by themselves but the growth rate is not fast as would be needed for economic purposes. You could breed the bantam white cornish to try for yourself. Good Luck and let me know if you have questions or comments. This is a private posting area. A valid username and password combination is required to post messages to this discussion.