The way games have been selected, they have had to deal with some level predation. This is especially true before the advent of complete diets for chicks. It has little or nothing to do with re-wilding, rather you manage predator pressure such that losses to it are acceptable. The ability to close gamefowl life-cycle without free-ranging hens and use of walks is a recent phenomenon. Prior to that, only adult males and high value hens were confined because keeping them in good nutritional status was very expensive. That transition to use of brooders and rearing in confinement did not really get started until about the 1930's. Prior to that most keepers of games had access to multiple barnyards where somebody kept predator numbers under some sort of management system that often involved flat out hunting. My forefathers hunted foxes, raccoons, and raptors (illegal very much so now and sometimes even then) more when reliant upon the walk system to protect stock than to have pelts for the fur buyer. I am pretty sure others did the same. The cockyard / keep which many people now only have was the part that required real skill.
