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Neosporosis is one of the most important causes of abortion in both dairy and beef cattle in many countries. The objective of this study was to quantify the effect of Neospora caninum seropositivity on reproductive parameters in three dairy herds and the dynamics of anti-N. caninum antibodies during gestation in naturally infected cows. Blood samples from all animals were collected nine times on each of the three farms over a two-year period. Serum was tested for antibodies against N. caninum using the indirect fluorescent antibody test (IFAT) with a cutoff value of 1:100. The relative risk of abortion between N. caninum-seropositive and seronegative cows varied between samplings at all farms, but there was only a statistically significant difference (P 0.05) were found regarding gestational age at abortion, repeated abortion, number of inseminations for conception and calving intervals, between seropositive and seronegative cows on all the farms.

Neospora caninum: análise dos parâmetros reprodutivos em rebanhos leiteiros no Brasil