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As I've stated before, that is a good theory, but unless you have those chicks on the ground their very first week of life, when they come out of the brooder at four to six weeks, their innocent little systems may be overloaded with oocycsts in your soil. I keep telling folks that you can keep a pristine clean environment, follow them around with a pooper scooper under their little bums and bleach the waterers daily, but they can still get cocci when they hit soil. The level of amprolium in the starter is so low that it does little good if your soil is loaded with the protozoan that causes cocci.I think non-medicated feed is fine, if you can get it.
Chicks raised by a broody are sort of "inoculated" against cocci by mama's poop they taste as well as her showing them what to eat on the ground and letting them build immunity naturally. My broody-raised chicks never get cocci. My brooder raised ones always do.
I have some 4 week old brooder raised chicks that I want to put outside in a pen with where adult chickens have been. They are on medicated starter right now. If I see signs of cocci, would it be too hard on their systems to add Corid to their water while they are eating the medicated? Would the "double dose" of amprolium hurt them?