X2 I agree with you here on this. Folks that have used medicated feed but have never seen a case of Cocci in their chicks, it probably has nothing to do with the feed. Not that medicated feed doesn't work period, as it most likely does in mild cases? But possiblely these chicks were never going to get it due to brooder conditions, stronger chicks, etc... ?
I am no expert on this but why use it if in the end the bird is going to need to develop immunity at some point in their lives. The medicated feed is not some sort of permanent inoculation in that they will never contract cocci. In the near future their bodies will need to become immune.
In my humble opinion, if anything, medicated feed might weaken their immune systems? I would think a baby's body is genetically programmed at those first few days/weeks to deal with things quick so as to survive. This "window of opportunity" on the speedy reaction from the immune system could close, making the immunity sluggish when you keep it from doing it's job, as with medicated feed?
Nature has much of this worked out already. Chicks raised by broodies are known to be healthier...in contact with the dirt, contact with outside organisms, bacterias, other chickens, always on new ground, etc... But when we stuff hatchery chicks in a tiny space, stuff happens. LOL
All this being said...I am not knocking Medicated Feed and for newbies that have never kept chickens and have just brought home a box of peepers from the feed store, using Medicated Feed might be a good idea. I personally don't use it.
