RELATION OF PLASMA PROGESTERONE TO MID AND LATE TERM BOVINE ABORTIONS DUE TO VIBRIO FETUS INFECTION

were aborted 5 to 7 days post-inoculation; foetal death occurred several days before expulsion. Peripheral plasma progesterone levels declined at the time of foetal death. Cows injected with V. fetus during the third 3 months of pregnancy aborted 9 to 20 days post-inoculation and in a majority of cases delivered live calves. The decline of progesterone levels on the day of abortion is very similar to that observed before normal parturition. Progesterone levels in the dam reflect the viability status of the foetus. The decline of progesterone associated with abortion may be due both to placental dysfunction as well as luteolysis of the cl because of the release of products from the infected foetus.

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