I added some of my mostly whole-grain fermented feed mix to my 4 week old chicks feed. I mixed it in with their non-medicated starter grower to entice them to eat it. I have no idea how they managed to do it but they ate all the fermented feed and barely touched the started grower they'd been on since day two of their lives. It's great news I guess except I just bought a 50# bag of started grower yesterday!
Put your grower in with the grains and ferment it all. It works great. That's what I do.