Vitamin K build prothrombin. Prothrombin helps to coagulate the blood. Green grass contain a large amount of vitamin K. This vitamin is soluble to fat. Required vitamin K produced in the digestive system of animal by synthesis of bacteria. Lack of vitamin K obstruct to stop bleeding and reduce prothrombin in blood. This is the main symptoms of vitamin K deficiency diseases in cattle.
Feed the animal sufficient green grasses. If needed feed them vitamin K mixed grainy feed.