Your meat birds will require a different diet than your laying hens. If you put them together, and your hens eat the same feed, then your hens may need to go on Weight Watchers after you have processed your meat birds.
I am actually raising meat birds with hens with no problems. All of them get along just fine. The only birds that don't like my meat birds are my turkesy. I have to closely supervise them when the flock is out free ranging. My meat birds were given to me by accident and they never went to freezer camp. So, it can be done. I was told that the meat birds would not live past a few months old. Today, they are 4 years old. Who know.
Good for you. You must have the secret.
No, no secret. I'm not the only one who has meat birds that have outlived their expected life span. There are a few people on this thread as well. It was just an experiement and I got lucky.