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This only pertains to the coccidiosis vaccine. If you chose to get the cocci vaccine, then you should not feed medicated but only because feeding it would null and void the vaccine, i.e., be a waste of money. Nothing bad is going to happen to your chicks if you vaccinate for cocci and then still feed the medicated chick starter.
Feeding medicated chick starter to chicks vaccinated for Marek's has no bearing on the vaccine at all. Two different things.
I choose not to vaccinate. My chicks are fed the medicated starter as an insurance (but not a guarantee!) against coccidiosis. Other than that, I prefer that they gain immunity against disease the natural way, by being exposed in their enviroment.
For what it's worth - the medication in medicated chick starter is not an antibiotic. It's a coccidiostat. It is a medication that serves to retard the life cycle or reduce the population of pathogenic coccidia to the point that disease is minimized and the host develops immunity.
Feeding medicated starter has no bearing on any other disease or infestation other than coccidiosis.
