Journal of Veterinary Medical Science
Online ISSN : 1347-7439
Print ISSN : 0916-7250
NOTE
Proportion of Abortions due to Neosporosis among Dairy Cattle in Japan
Masahiro KOIWAITakafumi HAMAOKAMakoto HARITANIShinya SHIMIZUKumiko KIMURAItsuro YAMANE
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2005 Volume 67 Issue 11 Pages 1173-1175

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Abstract

A retrospective cohort study was conducted to clarify the association between seropositive reactions to Neospora caninum and subsequent reproductive disorders among dairy cattle in Japan. A statistically significant association between Neospora seropositive reactions and abortions was observed (P=0.016), and seropositive cattle were 6.1 times more likely to abort compared to seronegative cows. No significant differences were observed between seropositive reactions and other reproductive disorders such as conception failure, perinatal death and calf mortality. As indicated by estimation of the attributable fraction, 83.6% of abortions in Neospora seropositive animals may be attributed to N. caninum. Considering seroprevalence of N. caninum in the cattle which aborted in Japan, 21.8% of abortions were estimated to be caused by neosporosis in Japan.

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