Calcium is an essential element in the birds 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 egg shell formation and even to egg-binding. Giving extra calcium to birds during the breeding and growth season is therefore strongly recommended. Sufficient calcium ensures good egg shell formation and the development of a healthy skeleton.