You probably also want to more than "even them out." A good ratio is 4-6 ducks / drake. I have 13 ducks total with two drakes. The drakes established pecking order and all is good. The Alpha (Kaine) hits at least 6 (and more likely 11) of the girls every time their pools are filled. The non-Alpha (Tevye) still sneaks in 2-6 girls. Three drakes will probably fight a lot if there are less than 9 ducks and the ducks will be constantly harassed. It might be possible to trade out a couple of the drakes if you want a smaller flock or if you go large there are several places you can get day old ducklings shipped. I had good luck with Metzer, I know they have Mallards, cut their toes and they can vent sex them so you get what you want. But through them it cost me half as much to get 2 ducklings as it did to get 11 (they have a minimum order to discourage small shipments and smaller shipments need a heater pack.) Good luck with whatever you decide.
