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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1381-1385 |
| Number of pages | 5 |
| Journal | American Journal of Veterinary Research |
| Volume | 58 |
| Issue number | 12 |
| State | Published - Dec 1 1997 |
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- veterinary(all)
Cite this
Effect of congenitally acquired Neospora caninum infection on risk of abortion and subsequent abortions in dairy cattle. / Thurmond, Mark; Hietala, Sharon K.
In: American Journal of Veterinary Research, Vol. 58, No. 12, 01.12.1997, p. 1381-1385.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Effect of congenitally acquired Neospora caninum infection on risk of abortion and subsequent abortions in dairy cattle
AU - Thurmond, Mark
AU - Hietala, Sharon K.
PY - 1997/12/1
Y1 - 1997/12/1
N2 - 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.
AB - 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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M3 - Article
VL - 58
SP - 1381
EP - 1385
JO - American Journal of Veterinary Research
JF - American Journal of Veterinary Research
SN - 0002-9645
IS - 12
ER -