I have also put the shell grit i have out there for the hens! I still don't know if it is a source of calcium or just grit for the gizzard! I know i have had people say it is but i will post a pic just to be sure![]()
Shell grit should be considered a calcium source not a mechanical grit source, the reason being is that shell is a soluble grit and the acidity in the gizzard and crop will dissolve it in not time flat, plus it will simply not last long as a mechanical grit, it will crumble away in short... Granite, flint or quartz is a superior insoluble mechanical grit and will allow the birds to eat it for grit purposes and not OD on calcium...