Can you use clam shells for extra calcium?

[Homersolo]

Nine years later I'm following up:

Use an old sock as the clam sack and whack it with a hammer several times (with a rock as a backstop, not your hardwood floors). This will get your pieces small enough for them to consume without making a mess.

 

[onthefarmnj]

Just seeing this now. My crushed clamshells look like they have sharp edges. Can that hurt the chickens?

 

[Red-Stars-in-RI]

Just seeing this now. My crushed clamshells look like they have sharp edges. Can that hurt the chickens?

I'm guessing that's the big reason that you see oyster shell and not clam shell, as the oyster shell breaks far less jagged.

Not sure if it'll hurt the chickens or not, but I'd see if more "hammer time" helps the situation.

 

[notachickennut]

We had a dozen or so steamer shells earlier this summer. I wrapped them in an aluminum foil packet and left them on our grill after cooking out, taking advantage of the high heat of the dying coals.
Then whacked the packet with the grill brush (terribly lazy I know) they broke up nicely. I then dumped them into the cup we use to offer the crushed oyster shells. The girls have consumed them to no ill effect (a month later).
Now I look forward to the next mollusk shell leftovers.