Can anyone give me tips on how to fix this issue? I have one duck that has been laying these type of weakened eggs for a couple of weeks now. They ae all young ducks, having started laying in 2016. They have access to oyster shells and are pasture raised with a supplimental feed... This has caused one of my ducks to become an egg eater!! Nooo! Let me know if any other info would be helpful to pin down the problem. Thanks in advance!