Thank you all for the helpful suggestions and for not willfully ignoring my posts. I appreciate the alternatives to oyster shells.
Again I repeat, I AM NOT TRYING TO MAKE MY CHICKENS VEGETARIAN. I have chosen to stop responding to posts from people who choose to willfully misunderstand my point in order to what? I don't know...work out some aggression against vegetarians I guess. As I repeated numerous times, I am simply trying to eliminate slaughter byproducts from my chickens' diets. It is ridiculous to think that vegans/vegetarians have a problem with animals eating other animals. That is a part of nature. I have a problem with the way animals are treated in our farming system and choose not to participate. My chickens can catch their own food however they'd like and I will feed them healthy supplements (just as I do my cats and dogs - who do eat meat, btw, because it is necessary for them to live).
Again, thank you to all those who took the time to actually read my posts and respond