Generally the medicated chick starter commonly available at feed stores simply has Amprolium, a coccidiostat added, not antibiotics. Large scale meat bird and other large operations may use antibiotic laced feed but the medicated chick starter the rest of buy at the feed store simply contains a very low level of Amprolium. Many people, myself included, will feed it right up to around 18 weeks of age because that is the most suseptible period for chicks.Feeding medicated feed to vaccinated chicks will not "nullify" their vaccines. They will simply have been exposed to a lot of antibiotics. Perhaps, it is simply a philosophical choice. I choose to avoid unnecessary antibiotic exposure. What ever the choice.
Most people do not feed medicated feed past 6-12 weeks.
I guess my point is that Amprolium and antibiotics are completely different, they do not function the same way at all, they are not even in the same class. I wouldn't want new chicken owners to decide against medicated starter simply because they read something on a forum and think they are pumping their chicks full of antibiotics.
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