Calcium is an essential element in the bird's body. Amongst others it is essential for the correct functioning of the nervous system. Calcium deficiencies in birds regularly result in serious health problems.If the bird is not given enough calcium, it causes decalcification of the skeleton and bone deformation. In the hen a calcium deficiency during the breeding period results in poor eggshell formation and even to eggbinding. Giving extra calcium to birds during the breeding and growth season is therefore strongly recommended. Sufficient calcium ensures good eggshell formation and the development of a healthy skeleton.