Cheapest way to cull a laying flock for dog food - Page 3
If you advertise the ones you would like to cull you may find people who want them for training herding dogs, etc. My ducks are used to train my border collie stockwork. No ducks are injured, the ducks are stressed minimally, and I rehome them after a year. So people who use ducks for training will buy new ducks at least once a year (unless they are breeding their flock as I am). Otherwise I'd recommend making sure you have the help of someone experienced before butchering ducks. Done incorrectly you can prolong suffering which isn't fair to the ducks.