One of my friends raises ~400 ringnecks each year. We have also raised Chukars a few times as well. We have about 400 acres that we hunt, where we have a large covered pen to house the birds. We generally release 10-20 birds at a time, a few days before we hunt. I think the local predators thank us. We have tried to restock a "native" population on the property by overwintering hens and a few cock birds, and releasing them on greenup. After 3 years of this, we have very little evidence that any released pheasants are rearing young. The habitat would seem to be ideal. Here in NY, most pheasant hunting is from State or private raised birds, and is bascially "put and take." The local "native" populations have dwindled.
My friend also raises German Wirehair Pointers, from where I obtained my dog, Kelli. Nearing 4 years old, Kelli has been a great companion, and is hell on birds-both on land and water. Love that stumpy-tailed dog!
BTW, 1GUNRUNNER, my father-in-law has a 2 1/2 year old black lab bitch which is best friends with Kelli. You wouldn't believe how these 2 dogs play with each other!