I put oyster shell out once because I didn't want to start layer feed yet as my turkeys were still too young. My turks ate all the oyster shell!
I have since switched to layer feed, but have not placed the oyster shell out yet. I am getting very sturdy shells on the eggs. I was getting sturdy shells even w/ developer. Do I really need oyster shell? I free range as much as possible, but winter is coming.