The shell-less egg!

[jessiduck]

Hi all!
I've noticed for, maybe over the past 2-3 weeks, one of my four redstar hens is laying without a shell! They get plenty of exercise by free ranging, they eat healthy organic grain,
bugs, etc. Whoever is laying, lays with no yoke or casing on the egg! just the egg
white, which they quickly eat! Does anyone have any idea of what's going on? The only change I could think of was when I stopped them from free ranging whilst we were mulching our gardens for a week or two. Any advice is appreciated, thank you!!

 

[ChickensRDinos]

Are they on a layer feed or provided a calcium source?

 

[jessiduck]

Yes, I feed both my ducks and chickens layer feed. I've heard crushed up oyster shells are a great way for chickens to get calcium. Are there any other foods high in calcium that I could give them? They did not seem to like their own shells LOL! Yet they eat the egg whites!