Vitamin A is involved in the process of formation and prevention of function of epithelial tissues and mucous membranes is important for fertility and is essential for vision. Vitamin D3 regulates and corrects calcium and phosphate metabolism in blood and plays an important role in the uptake of calcium and phosphate from the intestines. Especially in young , growing animals vitamin D3 is essential for the normal development of skeleton and teeth. Vitamin E is atty acids, thereby preventing toxic lipo-peroxides formation. Furthermore, vitamin E protects the oxygen-sensetive vitamin A from oxidative destruction in this preparation.