The products included in this category make it possible to cover the needs that the complete foods cannot or should not try to cover.
This is the case of flint sand or calcium grit. An extruded food cannot contain sand and should only meet the general calcium needs (not the highest specific needs at the time of egg laying). For the birds to be able to self-regulate and more precisely meet their real needs, it is essential that they have Silex Grit and Calcium Grit permanently at their disposal.
Other supplements have been designed to supplement diets based on seed mixtures (deficient per se in trace elements, minerals and vitamins) and to facilitate the preparation of sprouts.