That is interesting I have heard of duck laying more than one egg a day and it's always chalked up to working out the kinks but never heard of the "holding"the eggs, But proper nutrition and care sure helps to get them on the right track to a great happy egg laying life. Your doing a great job there.They laid the eggs in the same nest spot, on the ground. I totally cleared the spot the day before. But as of yesterday, they have decided to go in the chicken coop any lay there. Still more eggs than ducks! I read they can lay up to two a day. I am thinking that because they were not getting the proper nutrition, that they were " holding" the eggs. They walked around like they were wearing "loaded" diapers...lol not walking like that now. I spoke to my father, and back in the day, my grand father raised broilers and about 1800 ducks at a time, ALL were RIR and Pekins for the meat market. He said highly possible they were holding eggs. I never heard it before. With the complete turn around they have done in the past two weeks...nothing would surprise me. Basic survival instinct.