Menadiol Diacetate(Vitamin K4) is essential for efficient blood-clotting and to maintain proper bone calcification. Practically Menadiol Diacetate(Vitamin K4) assists in the treatment of hemorrhagic-type disease, namely coccidiosis. The lack of Menadiol Diacetate(Vitamin K4) in chicks infected with Eimeria species sharply increases the rate of mortality and this is true also in case of mild or subclinical infections. Menadiol Diacetate(Vitamin K4) can also rent the hemorrhagic consequences brought about by the administration of sulpha drugs and antibiotics which, by suppressing the fermentation of intestinal bacterial flora reduce the endogenous bacterial synthesis of vitamin K. As family Vitamin, sufficient adding of vitamin K4 in feed can raise the healthy level of animal especially under stress condition.