We just somehow ended up with about 24 guineas which are about 3 months old, and 11 guineas that are about a month old. It has been a long time since we had guineas, and I seem to recall being told by someone not to feed guineas medicated chicken feed as it can kill them. We also have a flock of chickens. Can someone tell me about the medicated food? We have lost a couple of chickens lately and were considering switching to a medicated food but NOT if it can hurt my guineas.