Mel stern natural ground comprises 30-37 % calcium, 0,18 % phosphorus, 0,5 % potassium, 0,3 % sodium and no more than 5 % silicon and other elements. It is a homogeneous white powder, without smell, practically insoluble in water.

Calcium forms the bone, It maintains muscle tone, It prevents premature development of osteoporosis and osteomalacia, It promotes proper formation of the locomotor system, which is especially important for young animals and birds. Calcium ions are involved in the transmission of nerve impulses.

Chalk consumption norms are strictly focused on the needs of animals and birds' calcium depending on the physiological condition of the body, presence of pathological processes, and the age. With long-term unbalanced micro- and macro feeding animals and birds develop irreversible pathological processes, they are especially pronounced when calcium deficiency, vitamin D and iron.