posted 10 years ago
With those restrictions I would run it like this:
buy in 10 hens and 2 drakes.
raise them out and watch closely for the best birds. Big, calm, broody hens with good instincts for protecting the ducklings and tough, strong drakes with good body form and fast growth.
Keep hens that perform mothering tasks well and consider culling the rest. Eat them or sell them as you see fit.
Raise up new ducklings by allowing hens to go broody. this makes it way easier to replace the culled birds. Keep a few extra in case there are losses. Limiting to 12 is tough to do when you're trying to keep a stable flock of layers.
Keep the best drake of the original two and eat the other one.
Because hatching eggs will be 50% male and 50% female, you'll have to raise many more ducklings than you'll intend to keep just to get the number of females you need to go forward each year. That's the hard part of it really.
If you keep this cycle going through the years, you should have a constantly improving and dynamic flock of birds.
If the reason for the limitations is that you have noise ordinances and such, let me suggest Cayuga ducks. They are big, calm, quiet and friendly. They lay nice eggs and sit well. Drakes are nearly silent and hens only really make noise if you're late with the feed or if the drake is trying to mate with them at an inopportune time. Also, they are black which is a good trait in northern climates where cold can be brutal. Being able to absorb just a little more of that solar energy is a season extender for egg production.
This is how I've managed my chicken and duck flocks for the past few years. It's working out good so far.
Best of luck