Is it Possible to mix a Cornish Rock with a Different Breed

[Brave Rooster]

Ok so I have six Baby Chicks they are golden laced wyandotte,amerucana,new hampshire red, cuckoo maran,dominique and salmon faverolle and there all pullets and i want to make an experiment my friend he has Cornish Rocks and there baby's and he gave me one and he sad it was a Rooster so what i want to do is that when there all grown up i will try to breed the Cornish with this ladies and i want to see if i can make a new breed of chicken but what i'm wondering is that the baby's will live a normal life not like the Cornish one is it possible to change the genetics of a meat bird to be a normal chick and this is going to be an experiment what do you guys think could it work or not work My main purpose is to turn the Cornish rock into a normal chicken

 

[Ol Grey Mare]

Ok so I have six Baby Chicks they are golden laced wyandotte,amerucana,new hampshire red, cuckoo maran,dominique and salmon faverolle and there all pullets and i want to make an experiment my friend he has Cornish Rocks and there baby's and he gave me one and he sad it was a Rooster so what i want to do is that when there all grown up i will try to breed the Cornish with this ladies and i want to see if i can make a new breed of chicken but what i'm wondering is that the baby's will live a normal life not like the Cornish one is it possible to change the genetics of a meat bird to be a normal chick and this is going to be an experiment what do you guys think could it work or not work My main purpose is to turn the Cornish rock into a normal chicken

It is possible yes- however a couple of thoughts in reading your post. If you do cross the bird you won't be "turning the Cornish X into a normal chicken" as you will no longer be working with a Cornish X in the resulting hatches, but a mixed breed bird. There are further steps from there to having developed an actual "breed".
The first concern, though, before even reaching that point, is that you are going to have to employ very different management practices in raising this bird and the rest of your chicks as you will need to carefully manage the feed intake and and activity of the Cornish X to control his growth and development rather than allowing it to run the pre-programmed course of quick, massive growth. Only once you have successfully crossed that hurdle of getting the bird to the point of sexual maturity would the matter of the breeding become an issue.

 

[Ol Grey Mare]

A couple of additional thoughts - if your goal is the development of a true breed you'll want to evaluate the breeds of your hens, determine what your goals for the breed will be and select your stock from there. You'll need to manage your breeding so that you are hatching and raising only those birds you have selected for and then start your plans for the generations that will come after the initial cross in order to work towards a bird that would meet the definition of being a "breed" vs. being mixed birds.