An outbreak of the unusual type of umbilical cord (UC) bleeding, which caused a big economical loss, was observed in one farm in Chiba prefecture and its occurrence pattern, clinical symptoms and hematological data were examined. The farm had 350 breeding pigs and raised the new-borne pigs. Between June 1994 and February 1995, the UC bleeding was observed in 223 cases (40.8%) of 547 parturitions and 83 new-borne pigs were died due to bleeding. Epidemiological investigation indicated that these bleedings were not due to hereditary or infectious causes. The new-borne pigs did not show any clinical symptoms. They had good contractions of the umbilical artery just after birth, however, the UC gradually became to be congested by blood and started bleeding at 1 hour and 34 min (+-45 min) after their births. Thereafter, the congestions of UC were deteriorated and blood was leaked from both of cutting stumps and some injured parts of the UC. In the blood coagulation analysis, number of blood platelet, bleeding time, coagulating time, APT and PT were all within the normal levels, however, decreased level of fibrinogen was detected. No major abnormalities were observed in pathological examinations. Based on the above examinations, these UC bleeding symptoms were suspected to be caused by incomplete blood coagulations due to the decreased level of fibrinogen in the fetus.

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Staphylococcus aureus, isolated from bovine mastitis in South Veterinary Clinical Center in Chiba between October 1990 and April 1993, were examined for their coagulase type (CT) and enterotoxin type (ET), and productivities of toxic shock syndrome toxin-1 (TSST-1) . ET and TSST-1 were not significantly associated with degrees of clinical conditions of mastitis. Bacterial type in significant crinical cases had 30.9% in CT-6, 47.8% in ET-C strain and 34.3% in TSST-1 against the whole isolated bacteria. One or few strains which had same types in CT, ET and/or TSST-1 were mainly detected in each farm.
Therefore, the present study indicated that ET and TSST-1 induced the inflammations and some bacterial or host factors might be also playing some important roles in determining of the clinical conditions of mastitis.

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