I am new to ducks but have had chickens for awhile now. I think that laying at 14 weeks is a bit early but that is not what I was wondering. Egg number 1 was without a shell (I'm thinking they need calcium) but egg number two was half the size of egg number 1 and broken (I don't know if it was broken or it came out that way?) and this morning egg number three was huge and normal, just a little dirty. My question is, can I give ducks free choice oyster shell just like chickens? Second question, since there was something wrong with the first two eggs should this third one which appears to be normal be good to eat? I kept the soft shell one, what about that one? Thank you.