Welcome to BYC. If it's non-medicated, you can continue to feed it as a grower until they are 16-18 weeks, at which point you can switch to a layer feed. Regular medicated feed should be switched to non-med grower at 8 weeks. Please note that medicated chick starter is recommended. It's probably not going to hurt them to be on a non-med but medicated gives them a better start.