This morning we recvd 31 chicks from McMurray (all alive!). They were vaccinated so I am feeding them regular chick starter. We also have four, 1-week-old chicks that were not vaccinated and we were told to feed them medicated chick feed (as soon as the brooder construction was complete the kids had to buy chicks to put in it!). I am planning on keeping the two groups separate for a while so different feeds is no problem for now. But, how long do the non-vaccinated chicks need the medicated feed? I would like to begin mixing them in maybe 2 or 3 weeks.