Why do want to feed aureomycin (chlortetracycline) to your chicks? Are they sick? It is used for treatment of some respiratory diseases such as MG and MS, as well as a treatment for enteritis and other intestinal diseases. It can be used for coccidiosis, but Corid would probably be better for that. The thing that I don't like about it is that it seems like it would be hard to get an exact dosage into your chicks. The granules would have to be mixed into their feed and be roughly the same size as their chick crumbles. I would probably use something else, but I would beglad to help if I can.