The release program in much of Alberta has nothing to do with establishing a wild population, it is to provide an opportunity to hunt pheasants in areas where they are not native, and will typically not survive winter. It is pretty much like stocking trout in lakes, where they do not reproduce. The release sites do take some pressure off of the wild birds, but personally, if I lived close to where I could hunt wild birds, I wouldn't bother with the release sites. If a pheasant does survive the hunting season in Alberta, the odds of it surviving winter are extremely low, in the less than 5% range in the northern areas.