We raised ringnecks in the state of Pa for 15 years for the game commission. We got them the same day they were hatched and at Cambridge Springs Pa and it was a mad dash home to get them under the brooders.
We did use wood chips that were 3/4" or larger and very thin. They would grab them and carry them, as far as eating them, they will try to eat anything.
We used mason jar waterers and just aluminum pie pans for the food with very small gravel mixed in for their gizzards to help them digest their food.
In a week or so we started putting them out in the small pens which were 15'x30' under chicken wire, each day, to get them used to outside. We would chase them back in every night with fly swatters.
In about 3weeks we put them in the big pen (1 acre under wire) and they would stay there for another 3weeks. The wire around the sides was buried in the ground a foot down to keep the foxes from digging in.
We kept the small pens mowed but the large pen we would mow 3 weeks before we put the birds in there so it was grown back up with soft grass instead of old hard stuff. We would mow down paths down the center and then latterally like a grid right before the birds were put in permently and put put the waterers up and down the paths. There always ended up being a family or two of rabbits living in there also. We would raise them with the ringnecks
We put out an acre of lettice for them to suppliment they're diet.
Man do they love lettice. Two five gallon buckets stuffed full, we they saw us coming with that we would get mobbed. we would dump it and run.
At the end of 6 weeks the Game Commission would come and we would start netting birds inside our pen,
A lot of years my father would get 505 or 510 peeps and would still end up with over 500 netted when it came time for the GC to catch them.
They would give us the birds and the food and pay us $1.35 a bird for raising them.
They shut the program down in the1970's I don't remember what year.
As far as canibolism with the birds attacking each other, Dad had some kind of red gel he would put on the birds wound, It must not have tasted very well and maybe made them a little sick but it sure broke them of chasing one down with a wound and pecking it to death.
I don't expect they lasted very long in the wild and alot of them found they way back to our pen and expected to be fed. There would be about 25 or 30 of them find their way home and we always had extra food left over so we would close all the doors again at night to keep preditors out and keep feeding them to get rid of the extra food. We would open the doors every morning and they usually moved into the garden to finish off the rest of the lettice.
Beautiful birds but dumb as a rock.