A survey of causes of bovine abortion occurring in the San Joaquin Valley, California.

Mark L Anderson, Patricia C Blanchard, B. C. Barr, R. L. Hoffman

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51 Scopus citations


The causes of abortion in cattle in the San Joaquin Valley of California were surveyed from submissions to the California Veterinary Diagnostic Laboratory at Tulare. Four hundred sixty-eight abortion cases were examined. Most submissions (89%) were from large drylot dairies, milking an average of 814 cows. Abortion evaluations included necropsy, histopathology, bacteriology, virology, and other immunologic and serologic tests. A specific cause was identified in 29.5% of the abortions. Bacterial infections, most of which were sporadic, accounted for 16% of all abortions. Viral causes and protozoal infections were diagnosed in 5.6% and 3.2% of the abortions, respectively. Fetuses with protozoal infection had histologic lesions of focal nonsuppurative necrotizing encephalitis, and protozoa were detected. Similar histologic lesions were seen in 80 additional fetuses (17.1%), and although an etiologic agent was not identified for these cases, a protozoal infection was suspected.

Original languageEnglish (US)
Pages (from-to)283-287
Number of pages5
JournalJournal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc
Issue number4
StatePublished - Oct 1990

ASJC Scopus subject areas

  • Microbiology
  • veterinary(all)


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