I have 3 Pekin ducks which are 2 ½ years old. Up until now they have been excellent layers, each laying 1 egg per day with very few misses. Recently (last couple of days or so) they have all begun to lay broken eggs, to be more specific, the shells are so thin that they break from the ducks sitting on them. What is most frustrating, is that nothing has changed in the coop or run, and their diet is the same as it has always been (Layena pellets, occasional BOSS, available oyster shell and a handful of peas daily. Once in a great while watermelon rind and some veg scraps). In their run is a small pond with fish, mostly tilapia, and I have seen them eat an occasion frog. The water they drink is from the pond or from the fresh water feeder in their coop. They free-range in the run during the day and are closed in the coop at night as always. (We cannot free-range them without containment or they become hawk, bobcat or alligator food.) Of course I have read about thin shells being due to calcium deficiency, however, our soil her in FL is made up of crushed shells, and they are getting Layena which is high in calcium. I also sprinkling a bit of crushed calcium carbonate on their peas each day. So I am sure they are getting enough calcium. Up until now their shells have always been quite strong. Does anyone have any idea what may be happening here? Since it is effecting all of they at the same time, it sure seems like a diet issue but I am at a loss of what to change. BTW we have no vet here that has any knowledge of poultry, we are in a very rural area and cows, goats and horses are the common animals of choice. Their attitude is that chickens (and ducks) are disposable so no one ever brings them in for care.