Large fragile spot on eggs

[Spudlo]

My Amberlinks lay huge eggs. I have one that lays bullet shaped eggs. But lately the top has this rough dark spot that if you slightly push on it cracks?

 

[aart]

How old is bird, in months?
How long has she been laying?

What all and how exactly are you feeding?
Are there other birds of same age/breed that are laying funky eggs?

 

[Spudlo]

How old is bird, in months?
How long has she been laying?

What all and how exactly are you feeding?
Are there other birds of same age/breed that are laying funky eggs

Hi. She is a 22 month old Amberlink and started laying at 16 weeks.. She's one of three Amberlinks, one Barred Rock, and a Wyandotte live together, they eat Dumore 16% Layer feed, and they get fortified scratch with worms and steel cut outs mixed in the morning for a treat. They eat cabbage, squash, and watermelon in a week. And have extra oyster shells on the side. Their water has chick boost probiotics in it.She's always been great, just lately (past month) those eggs with the weird crumbley spot?? No one else is laying anything different than large perfect eggs.

 

[aart]

She may just not thrive on that diet.
Awful lot of extras that may be diluting the micro-nutrients in the layer feed.