Scratch is mainly intended to be a boredom buster for contained flocks. It's something you toss a few handfuls of into the run for them to scratch at to keep them busy. It's not a complete, balanced feed. It's a treat. A nutritionally complete and balanced feed should be available. My flock free ranges, but I always have a feeder with flock raiser available to them. Some days they barely touch it, other days I have to refill it; but it's always there. Crushed oyster shell also needs to be available. I have a flock with cockerels, roosters, and immature pullets; so I don't bother with layer feed at all.