Soft shells

For the first couple of years my girls laid one egg a piece every night. For the past year egg laying has been sporadic. For the past couple weeks one of my girls is laying no shell eggs. We introduced oyster shells about a year ago. I see them occasionally eating them and my husband tells me he sees it in their droppings. They hate kale so that is a no go.

The only difference in the past year is we purchased two ducklings from TS. Unfortunately they both were drakes. We have kept them separated since April for mating season. They really miss each other. The boys lay on their side of the fence and the girls lay up against the fence on their side. I know stress can cause soft shells.

Otherwise the girls are very healthy. I’m just worried that the one that really struggles will get egg bound. She definitely has bad days when has a hard time getting the egg to pass.

I have 2 mallard hens, 1 mallard drake and 1 Peking drake.

Anyone have any suggestions?