VITAMIN D

Vitamin D (D2 Ergocalciferol, D3 Cholecalciferol) is best known as Calciferol (D3) This name arose from its ability to enhance the absorption of calcium. Only two forms, ergocalciferol and cholecalciferol, are important as dietary sources oft the vitamins. Vitamin D’s most important function is in regulating the calcium and phosphorus metabolism. Vitamin D2 and vitamin D3 are almost equally valuable in their antirachitic effect of mammals, whereas chicks and poults can efficiently utilise only vitamin D3. As vitamin D3 can also be stored better in the liver. Almost of Vitamin-D-Products for birds contain Calciferol (Vitamin D3). The deficiency symptoms of vitamin D are bone malformations (rickets, bowing of the legs, thickening of the joints and an icreased incidence of fractures). Vitamin D3 occurs  naturally only in animal tissues, particularly in salt-water fish (tuna, halibut and cod liver) and also in cheese, yogurt and eggs. .
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