Your rooster has NO NEED to eat oyster shell. He won't be "making" a single eggshell . . . not one.
Edited by digitS' - 11/9/09 at 12:21pm
Keep in mind that layer feed should have enough of what a layer needs to produce eggs with good shells.
Some soils are naturally high in calcium. That's the primary ingredient for making an eggshell. The hens get enough calcium by eating things off the ground, eating grit, and eating dirt.
Unless the shells are soft - you probably don't need to worry about it. The hens should be good at self-regulating calcium as long as they have some available.
Smilies? Click "More Smilies" then the one of your choice . That cute little chicken?
Edited to say: Oh, I see that you are in Seattle! Your soil doesn't have very much calcium in it, I suspect.