EN
This work aimed to assay the physiological values of basie blood coagulation indices and to determine the influence of breed on their range. Studies involved 105 horses of 6 breeds: Arabians, Thoroughbreds, Great Polish, Pony, Polish Primitive Horses and other breeds. It was found that under physiological conditions a mean coagulation time, kaolin-cephalin time, prothrombin time and thrombin time were 12.0 min, 124.0 s, 14.1 s, and 26.9 s, respectively. The concentration of fibrinogen was 3.48 g/ml and platelet count was 177 x 10⁹/1. Statistical analysis revealed that the breeds examined affected all the indices measured. The most efficienf mechanisms controlling haemostatis showed Thoroughbreds and Arabians contary to ponies Polish Primitive Horses.