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The Veterinary Record, Vol 139, Issue 5, 110-114
Copyright © 1996 by British Veterinary Association

Reduced conception rates in dairy cattle associated with serological evidence of Leptospira interrogans serovar hardjo infection

G. S. Dhaliwal BVSc&AH, MVSc1, R. D. Murray BVMS, DVM&S, MRCVS, DBR1, H. Dobson BSc, PhD, DSc1, J. Montgomery 2, and W. A. Ellis BVMS, PhD, FRCVS2

1 Department of Veterinary Clinical Science and Animal Husbandry, University of Liverpool, Veterinary Field Station, Leahurst, Neston, South Wirral L64 7TE
2 Veterinary Science Division, Stoney Road, Stormont, Belfast BT4 3SD

Fertility data from 673 cows in five dairy herds with a moderate to high seroprevalence of microscopic agglutination titres (MAT) of ge1:10 against Leptospira interrogans serovar hardjo were collated to assess the relationship between pregnancy rates and antibody titres to serovar hardjo. A significant proportion of failures of conception (10 to 13 per cent, P<0·001) were associated with MATS of 1:10 to 1:100; the overall pregnancy rate of the seronegative cows was 28·5 per cent higher (P<0·001) than that of the cows with MATS of ge1:100. First service pregnancy rates showed a similar trend but the differences were significant (P<0·05) only in cows with antibody titres ge1:30. An assessment of other possible risk factors for reduced pregnancy rates, such as lactation number and calving to first service interval, had no effect on the statistical results of the study or its conclusions.




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