some of us use them in our sustainable meat bird experiments. Feed restriction and exercise is the key to longevity..
Make sure they have an area big enough to exercise in. They will go a couple hundred ft to look for food if you can let them. Keep the food and water far apart so they have to travel... well unless it's really hot, they need more water than an average bird. I feed fermented feed so they get extra water that way too.
https://tikktok.wordpress.com/2014/04/13/fermented-feed-faq/
after a week old feed 2x a day all they can eat in 10-20 min. Yes they will cry for more, but they will forage and keep active. I had 5 cx, 2 barred rocks and 2 meat turkeys together the same age... everyone had restricted feed and, when they were still in the brooder, I took them outside they got a lot of exercise looking for bugs and weeds to fill up on.
keep with layers so they stay active.
they can climb the ramp but will have trouble roosting on a roost more than 4-6" high
the winter is hard on them if they can't get enough exercise, they really pack on the pounds.... kinda like me