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  • Title: Effect of congenitally acquired Neospora caninum infection on risk of abortion and subsequent abortions in dairy cattle.
    Author: Thurmond MC, Hietala SK.
    Journal: Am J Vet Res; 1997 Dec; 58(12):1381-5. PubMed ID: 9401685.
    Abstract:
    OBJECTIVES: To estimate the extent to which abortion risk in dairy cattle during subsequent pregnancies was associated with congenitally-acquired Neospora caninum infection and previous abortions. ANIMALS: 468 Holstein cattle. PROCEDURE: Newborn heifer calves were tested for evidence of congenital infection attributable to N caninum and examined repeatedly until the completion of their second lactation for serologic status and evidence of abortion. RESULTS: Compared with noninfected cows, congenitally infected cows had a 7.4-fold higher risk of abortion during their initial pregnancy and a 1.7-fold higher risk of aborting the first pregnancy during their first lactation. During the first pregnancy of their second lactation, congenitally infected cows that had aborted previously had a 5.6-fold higher risk of abortion, compared with cows that had not previously aborted and that were seronegative. The fetal risk period for N caninum-associated death began sooner and extended later during the initial pregnancy compared with subsequent pregnancies. CONCLUSION: Congenitally acquired N caninum infection can cause a substantial number of abortions during the initial pregnancy of heifers, with abortion risk attributable to N caninum decreasing in subsequent pregnancies, possibly because of selective culling. Subsequent abortions can be expected in congenitally infected cows that have aborted previously.
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