My Rouen duck Ella is about 1.5 years old and had been laying good, solid eggs every day since about October of last year. In the last 2-3 months she gone from laying good eggs, to laying a few soft eggs a week, to laying nothing but soft eggs every day. I've given her free choice oyster shells and now I'm mixing them in with her feed. She and her mate Sam have been on Flockraiser since they were young. She eats and acts normally despite the soft eggs, which turn up just about everywhere, including their pool. I honestly can't remember the last solid egg she laid. Does she need some other calcium source or does this sound like a reproductive issue? I don't need to have the duck eggs and I'm not going to incubate any of them, but I just want to be sure this isn't bad for her for some reason and I'll take her to the avian vet.