Because poultry have no teeth, they need a hard substance in their crop to grind the feed. This helps them utilize the vitamins and food value in what they eat. (Calcium dissolves in the crop and does not take the place of grit).
If you are unable to buy grit or oyster shell, we can send it to you. We apologize for the high cost as it is expensive to ship. Don't let your birds go without these important parts of their diet.