W. Heuwieser et E. Grunert, A CESAREAN-SECTION MODEL TO CHARACTERIZE COAGULATION IN THE FETAL ANDUTERINE CIRCULATION DURING LATE-GESTATION IN DAIRY-CATTLE, Journal of veterinary medicine. Series A, 40(8), 1993, pp. 609-614
A study was conducted to measure a coagulation profile including proth
rombin time (PT), activated partial thromboplastin time (APTT), thromb
in time (TT), fibrinogen concentration (FIB), and plasminogen activity
(PLA) in the jugular vein, umbilical vein and artery and uterine vein
of 18 Holstein Friesian cows during late gestation. A caesarean secti
on was performed on all cows before term in order to obtain blood samp
les from the different sources and to deliver the calves. Blood plasma
obtained from the umbilical vein and artery had a longer prothrombin
time but shorter activated partial thromboplastin time and lower conce
ntrations of fibrinogen and plasminogen than peripheral blood plasma.
Thrombin time was similar throughout all blood vessels. No significant
differences existed between the two samples drawn from the jugular ve
in before and during surgery. Highest coefficients of correlation were
found between blood samples drawn simultaneously from the jugular and
uterine vein (R2 = 41 to 96 %).