I am providing grit and oyster shells both to my 9 pullets (20 weeks). So far I am keeping them confined to the coop and run and not free ranging them any for a few weeks until they get settled in. I was wandering if I did not provide the actual grit would they use the small bits of oyster shells as grit if it is needed? I didn't know if I needed to offer both or just the bag of oyster crushed oyster shells? They look to be about the same size.
Will they use oyster shells as grit?
I see your line of thinking. I have found that both the OS and Grit lasts a long time. I buy in the 25# bags (still have a small bag of chick grit leftover too) and have plenty. I would say depending on how many chickens you have both will last at least a year or so.
I just put some in separate dishes (secured to a post) and leave it for them free choice. They get what they need.