Speaking of questions, I know you only use your duck eggs for ducklings but my KC's eggs are significantly increasing in weight the more she lays. She has only laid 5 eggs and been very consistent. My Pekin skipped one day and has laid every day since. Not the KC. She has laid every singe day since day one of laying.
I know with chickens the older the chicken, the bigger the egg. Is this true for ducks as well or is it just that their "egg making machines" are ramping up?
This is a 2015 KC, right? It's normal for duck eggs to get somewhat larger after the start of the laying season, even if they're in their second season or beyond. My girls start their season with very tiny eggs, ones that aren't of any use for anything. Also, even if they stop laying for a time during the season, then start again, the first few eggs are sometimes abnormally small.
Anyway, I guess that was my long way of saying I see the difference in egg sizes more within the season than from season to season. The normal size eggs from each season don't seem any larger to me than they did the season before. Maybe others who've had difference experiences will respond. You've got me wondering if this could vary from breed to breed. There are many breeds I've never owned.