Not to put down canning, since we do can some things.. but FREEZING is still a bit easier if you ask me. We boil down our stock, and then freeze in ice cube trays (try to flash freeze). After they turn to ice cubes, we dump em in a zip lock and zip out the air.
I have converted MOST of what we can to freezing due to simplicity. Yes, canning will preserve longer than freezing, but the way I look at it is that by the time you have used all your stock, you are ready to harvest a few more birds.
A side note; we have also started freezing our tomatoes (cut in half). We do the same process with those and have cut our preservation in half.
The downside? If your power goes out for a period of time, your work is in vein!