Yes, Oyster shell and granite grit are always free choice in their pens, not ever mixed with their feed. Surprising how much Oyster shell they eat. Grit lasts a long time in the gizzzard, and smashes feed well, sand and dirt, do not, may not give the hens the best breakdown of grains, even cracked mix grains. No matter if your are not hatching but since I hatch, it is important for good shells! And because commercial layer feed may not keep vitamins very long, when I am saving eggs for hatching, I hand feed (birds in each breeding pen of 3) Codliveroil sandwiches 2 or 3 x a week. 2 T of plain cod liver oil on a slice of multigrain bread and another slice over the tip. 1/4 of the sandwich for each pen of 3. This insures the Vit A-D, they need for NO splayleg chicks (hip bones not finished at hatch time). They love it and fly up when opening their pen door--hearing the plastic wrap unfold!--- Also a very good taming practice. Always learning new happy things with the bantams--and always looking for new "what works for me" trials.