Since poultry have no teeth they have evolved to peck grit which helps to grind their food in the gizzard. Oystershell. limestone or flint grit should always be available (in a separate container to the feed) so the birds can help themselves.
These are a source of calcium to provide strong shells.
Heygates feeds have sufficient added limestone for birds which are fed ad-lib pellets or meal.
A supply of grit is important in helping to prevent Impaction problems
This product is a mixture of flint grit, limestone grit and oystershell grit.