BLOOD COAGULATION AND HEMOSTASIS IN THOROUGHBRED HORSES.

Summary Coagulation studies, bleeding times, platelet counts and platelet adhesiveness were measured in a group of thoroughbred horses. When compared to normal human values the horse had elevated levels of the prothrombin complex factors and factor IX, equal levels of factor VIII, and low levels of factor XI and factor XII. Exercise did not alter the level of factor VIII. Bleeding time and platelet adhesiveness were comparable to human values, although the horses'platelet counts were relatively low.