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  • Title: Plasma progesterone concentration in the bovine before abortion or parturition in pregnant animals exposed to Sarcocystis cruzi, Campylobacter fetus, or Aspergillus fumigatus.
    Author: Baetz AL, Barnett D, Bryner JH, Cysewski SJ.
    Journal: Am J Vet Res; 1980 Nov; 41(11):1767-8. PubMed ID: 6782916.
    Abstract:
    Pregnant cows in the 4th and 5th month of the gestation were exposed to Sarcocystis cruzi, Campylobacter fetus, or Aspergillus fumigatus. Plasma progesterone concentrations were determined at intervals from before the cows were exposed until they had aborted or calved. The plasma progesterone concentration of the exposed pregnant cattle remained at 3.95 +/- 2.0 ng/ml until 24 to 48 hours before abortion or parturition, when it decreased to below 1.00 ng/ml. This pattern was similar for cattle exposed to each of the infective agents. Thus, changes in progesterone concentrations in bovine plasma cannot be used as a diagnostic tool for fetal distress or fetal death.
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