Shell-less eggs, How many is to many

[Laurasb65]

Over the last 3 weeks I've gotten 13 shell less eggs or very very thin shell, all found on the poop shelf in the morning. Their 22 to 23 weeks old.
This morning found 3. Their on Kalmbach, I was feeding all flock because I have 1 rooster. Since this started I've been mixing layer with the all flock. They do have access to Oyster shells all the time. But I've noticed their really not eating them. So I've been adding more layer feed. Its about 75% layer to all flock now.
With previous chickens I never had this.
Their all behaving normally, no vent issues.
They get to free range all day.
Feed and water is always available.
I was thinking, wow are they that low on calcium, now I'm concerned that there maybe issues with atleast 3 chickens.
Any suggestions would appreciated.

 

[Briarhopper Ranch]

Over the last 3 weeks I've gotten 13 shell less eggs or very very thin shell, all found on the poop shelf in the morning. Their 22 to 23 weeks old.
This morning found 3. Their on Kalmbach, I was feeding all flock because I have 1 rooster. Since this started I've been mixing layer with the all flock. They do have access to Oyster shells all the time. But I've noticed their really not eating them. So I've been adding more layer feed. Its about 75% layer to all flock now.
With previous chickens I never had this.
Their all behaving normally, no vent issues.
They get to free range all day.
Feed and water is always available.
I was thinking, wow are they that low on calcium, now I'm concerned that there maybe issues with atleast 3 chickens.
Any suggestions would appreciated.

I find that my hens prefer the flaked oyster shell to the crumble / grit style oyster shell.

Which type of oyster shell do you provide?

 

[Laurasb65]

I find that my hens prefer the flaked oyster shell to the crumble / grit style oyster shell.

Which type of oyster shell do you provide?

I have small size peices and flake. In 2 different bowls.
What brand do you use?

 

[Fluffy_Butt_Hutt]

Over the last 3 weeks I've gotten 13 shell less eggs or very very thin shell, all found on the poop shelf in the morning. Their 22 to 23 weeks old.
This morning found 3. Their on Kalmbach, I was feeding all flock because I have 1 rooster. Since this started I've been mixing layer with the all flock. They do have access to Oyster shells all the time. But I've noticed their really not eating them. So I've been adding more layer feed. Its about 75% layer to all flock now.
With previous chickens I never had this.
Their all behaving normally, no vent issues.
They get to free range all day.
Feed and water is always available.
I was thinking, wow are they that low on calcium, now I'm concerned that there maybe issues with atleast 3 chickens.
Any suggestions would appreciated.

can you use baked egg shells? My girls like thin flakes and shells the best. They also eat more than I ever expected, and even those not laying yet grab a noticeable amount (free choice, but feed has 2% calcium)