Eggs are can be fertile for around three weeks after there is no male. Depending on the females age, which has an effect on her ability to "hold sperm"
Good luck. I love KC Ducks! Be sure and share pictures.
I knew chickens could store sperm, but I had no idea if or how long ducks could. Then, I didn't know you could incubate duck eggs at the same time as chicken eggs, so they all went in the fridge. I've since learned differently, so again, Why not?
