I have a question about feed and my chicks going out into an old chicken run. My 8 b/o chicks are about 5-6 weeks old now. I kept thinking they were older, but just checked my receipt from Agway and now realize were probably born on April 1st. Anyway, they've been on medicated chick starter until today but have been going outside and into an old chicken run that's been here since who knows when. I let them out for 1/2-1 hr. There haven't been any chickens in the run in at least 6 years, maybe more. My question is, is it safe for them to be out in the dirt eating bugs and whatever else they like to eat now that they are off the medicated chick starter?