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I should have elaborated. If you want to feed them medicated feed for the protection that it offers in terms of aiding in the prevention of coccidiosis, then feeding a mixture of the two would dilute the concentration of the medicine, typically amprolium, thus making it less effective. The manufacturers calibrate the amount of medication to include in the food assuming that each chick will consume a certain amount of feed per day, getting a certain amount of the medication in the process.
I've only fed the medicated to brooder raised chicks. Since my hens started hatching their own (or as is the case right now, hatchery chicks being raised by the broodies) and I am keeping them in the coop with the rest of the flock, I feed the entire flock a flock raiser type feed called Allway Kernels. It is a starter/grower/layer feed and is of course unmedicated. Purina makes an identical food called, oddly enough, Flockraiser. This way I know the chicks are getting an appropriate food without the added calcium of the layer feed; which is damaging to young chicks kidneys. Also, my roos aren't getting the extra calcium of the layer feed which has been reported to cause damage to their kidneys and joints over the long haul. The only supplement needed with a flockraiser is oyster shell, for the laying hens. I find this food to be most convenient. No more worrying about who's eating what.
I just didn't want to advise someone that it's okay to mix the two if coccidiosis is their main concern, have them feed it thinking they had covered all the bases and then have chicks start dying from the cocci.
