No expert by any means here, but i would be a bit hesitent to feed something with those whole spiral shells in it. You can order a bag of Oyster shell grit from one of the poultry sites if you can't find it. The Oyster grit I feed says Oyster shell on the bag, and looks like crushed up white rocks. Sorry I don't know enough to give you a clear answer.
Good Luck!
MB
O.K thanks, yeah we know the guy at the feed store and i just asked for shell or oyster grit and he gave me a clear bag, which had these in it to me.
It's more of a test to see ow they go, so looks like i will have to do some research.
Thanks.