Chickens which are fed a complete diet such as Purina Mills® Start & Grow® SunFresh® Recipe, Layena® SunFresh® Recipe or Flock Raiser® SunFresh® Recipe do not need grit for digestion. If chickens are being fed whole grains such as Purina Mills® Scratch Grains SunFresh® Grains or if they are outside on the range, then grit should be fed to aid in grinding up feed in their crop. In this situation, grit should be fed at 1 pound per 100 chickens twice per week. It can be fed free choice or mixed with the regular feed.