I found a neighbor had duck eggs and since we have a world's supply of snails and millions of Banana Slugs here at the farm (and I raise heritage vegetables for seed), I decided I needed ducks. I don't bring live chicks in unless it is from a certified source (NPIP), usually incubate fertile eggs instead. This is the first year I have ever raised ducklings/ducks. When the neighbor dropped the eggs off on my porch when I was not home, I found out later that the eggs had been refrigerated for 2 weeks and (ugh).. these were so filthy I could not even see a shell on most of them. Out of 14 of them, I washed 12 under cold running water with a scrubby pad to get them clean, disposed of the other 2 which would not come clean, let them sit for 24 hours, marked them with pencil and then put them into a waiting incubator (along with turkey, chicken and pheasant eggs). I have been hatching eggs for a couple decades (I swear I don't feel THAT OLD!) and knew I was doing everything pretty much not by the book, but took a gamble as I knew it was probably hopeless with having flilthy eggs which had been in the for 14+ days in the fridge anyway and figured after I candled them, they would be soon composted for lack of fertility.
Huh..... Mother Nature is a funny thing. 11 of the 12 eggs were fertile and developing. On hatching day, all of the 11 eggs started hatching and I got ducklings from 9 of them. 2 of the smallest eggs hatched out weak ducks and they died less than 12 hours later and 2 which started pipping quit on me after 24 hours. But 7 ducklings have survived now and are a week old.
Once I would have said, "Don't bother with refrigerated eggs". Now I would say "Take the gamble, it is just a bit of electric and a bit of room in your incubator". On a side-note, I also put in 12 Buff Orpington eggs with the duck eggs in another gamble, as the rooster had been sold 9 days before the eggs I stuck in the incubator were even laid. I got 6 chicks out of 12 eggs. I was hoping to get three at best. I was smiling.
Cedar