I use pellets for all adults. Crumbles for all babies......any chick or chicken in isolation gets crumbles and scratch mixed. I did have a pullet who starved to death because she didn't comprehend pullets. Never had THAT happen before. By the time I realized, it was too late. Silkie mix, what can I say.....Everyone else, even small bantams (d'uccles) do fine on pellets.