But I'm guessing you mean butchered. I think it depends a lot on how it has been packaged. If you have one of those shrink-wrap machines that suck all the air out and use a thick plastic, they can avoid freezer burn for a much longer time.
In a regular deep freeze that doesn't have a defrost cycle - easily a year or more (as long as it's packaged well).
In a frost free type, even if it's packaged well, a few months tops. I don't keep meat in our fridge freezer as it's a frost free, so I can't say for sure. The defrosting cycle will thaw the top bit of meat and refreeze it over and over, and freezerburn is inevitable after a few months. That's where you end up with funky meat (and anything else that is in there for a couple months).
Same, if you've got a chest freezer and vaccumm sealer (and if you're really going to do all your own meat birds, it's totally worth the costs here) you can get a year. Thrick is you put all the time and effort into growing it, don't cheap out on the storing it. A house freezer ontop of a fridge unit? maybe 3 months.