For those of you that have replied about Swedes. Not to jack your thread OP but more info is great. I have four Swede drakes that have to go. I am wondering if 10 months old is too old to butcher. I really like them so if they are no longer good eating I will rehome them. They look like they will dress out around 4 lbs (just a guess). I tell you though if they are good eating it is easy to get more, the ducks breed and brood easily, and my daddy drake is a great father. These are just home bred ducks I got from a neighbor, they have some Rouen mixed in from a few generations back.
edited to add: My ducks forage extremely well too and ate only some feed each morning. I think if I had fed them meat bird feed they would have been plenty big to butcher last fall.
10 month old duck doesnt have to be slow cooked. the meat will still be far from tough, the reason they butcher ducks early is to not waste feed and because it minimizes the work it takes to pluck them