Effects of seropositivity for bovine leukaemia ...



Paper title Effects of seropositivity for bovine leukaemia virus, Mycobacterium avium subspecies paratuberculosis, and Neospora caninum on the calving to conception interval in maritime Canadian dairy cattle
Paper author(s) A. Tiwari, John A. VanLeeuwen, Ian R. Dohoo, Henrik E. Stryhn, Gregory P. Keefe
Proceedings title Proceedings of a meeting held at University of Warwick, England, 31st March-2nd April 2003
Date 2003
Conference S.W.J., Reid, F.D., Menzies
Abstract The purpose of this research was to determine the effect of seropositivity for exposure to bovine leukaemia virus (BLV), Mycobacterium avium subspecies paratuberculosis (MAP) and Neospora caninum (NC) on calving to conception interval (CCI) in dairy cattle in three eastern Canadian provinces. Samples were tested for antibodies against BLV, MAP and NC using commercially available ELISA test kits. The average CCI for seronegative cows for all three infections was 115.58 days. BLV and MAP seropositivity in 1st lactation heifers were associated with a 1.97 (0.29-3.65, 95% C.I.) and 7.16 (1.85-12.48, 95% C.I.) unit increase in log of CCI compared to seronegative 1st lactation heifers. The hazard (probability of getting pregnant at a particular time) associated with BLV and MAP seropositive heifers (first lactation) was 0.79 (0.65-0.95, 95% C.I.) and 0.49 (0.26-0.93, 95% C.I.) times that of BLV and MAP seronegative heifers, respectively..
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