Young birds that aren't of laying age, approximately 20 weeks old, should not be given layer feed. They instinctively won't eat oyster shell offered in a separate dish. Feed a mixed age flock the start and grow type feed, any feed acceptable for young pullets. Offer a separate full bowl or feeder of oyster shell. I never bother going on to feed layer. I think most BYCer's do the same. As long as there is oyster shell you never have to feed layer blends, so you never have to worry about who eats what.Question, what do you about feed? Don’t the younger birds eat a different feed than the adults? Just wondering...Thanks!