I have had mixed experiences with Cornish crosses. My first year I butchered 45 out of 46 chicks purchased. My only death was a 9 week old with heart failure. (I raised mine to 11 weeks - average weight was 7 lbs.)
My second year I butchered 35 out of 45. I lost them all over the board - leg problems, heart problems, I don't know what problems.
I posted something about it, and people said that if you raise tham right, you'll be fine. I did all I could to raise them correctly. I did a lot of research. And they are very well right that people have great success with them. But I just don't have that talent, even if I try my best. So for me (and I assume many other people who don't have the time to setting up a lighting schedule and controlling the temperature in "controlled housing") I don't have the time to "perfect" me raising skills. I would rather have a breed that adapts to my available method of raising.
For example, the breed doesn't cope with heat or cold very well. It will chill itself in a puddle in a rain storm instead of moving into the housing. They don't dust bath, scratch for bugs, or even stand up. I put mine on pasture and they all sat. Just sat.
I know people are gong to say that if you raise them right, you can get them to graze and you can keep them living. Well, call me dumb, but I wasn't able to.
Now, like my first year, you may have great success with them even if you don't do much. And maybe I am making it sound worse than it is. I am going to experiment with the freedom rangers, and see if they are any better. I may find that they have their own problems. and even if you had a bad year like I had, you still get good meat from the ones that live. You just have to cope with all the chickens that you have to dispose of.
That's good to know. My DH is on me about wanting to get more layers when he wants meaties! I do too but... keep hearing how much more work they are. Do you have to keep them in a seperate coop than the other since you have to feed them differently?
I wouldn't say that thay are that much work... I go down to my laying flock twice a day anyways to feeding the broilers was no big problem. I installed an automatic waterer that saved a lot of time. And the waterer wasn't hard to put up at all.
Besides feeding, you really don't need to do much (that is if you are raising broilers on litter - if you are pasturing, you would have to move the pasture around. Or you could just make a run off of the coop, and you wouldn't have to move it around)
That brings me to the point of housing. House you broilers separately. You hens will peck at the little broilers just like they peck at new comers. They eat different feeds, and they have totally different energy levels. Even if you raise a purebred stain or a more active strain with closer energy levels to the hens, think of it as bringing in twenty new birds into you flock. It is a nightmare! Pecking, stress, blood...
Anyways, hope this helps. Hope I didn't scare you about Cornis Crosses. They are not impossible, you just have to cope with them , and not them with you. Have fun with you adventures! No matter the breed, it is so worth it....yum yum....