Oyster shells

[SFBayArea]

I was wondering if I can simply crush oyster shells and give it to my chickens instead of purchasing it from the store?
How fine does it have to be crushed?
Thank you.

 

[nchls school]

I was wondering if I can simply crush oyster shells and give it to my chickens instead of purchasing it from the store?
How fine does it have to be crushed?
Thank you.

Yes. Like coarse sand.

 

[SFBayArea]

Sounds like a lot of crushing to be done.
Thank you.