The Association Between Neospora caninum Serological Status and Culling in Ontario Holsteins

Authors

  • G. Cramer Department of Population Medicine, Ontario Veterinary College, University of Guelph Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
  • D. Kelton Department of Population Medicine, Ontario Veterinary College, University of Guelph Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
  • T. Duffield Department of Population Medicine, Ontario Veterinary College, University of Guelph Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
  • K. Lissemore Department of Population Medicine, Ontario Veterinary College, University of Guelph Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
  • J. Hobson Department of Population Medicine, Ontario Veterinary College, University of Guelph Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
  • S. Hietala California Animal Health & Food Safety Laboratory System, Davis, CA
  • A. Peregrine Department of Pathobiology, Ontario Veterinary College, University of Guelph Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada

DOI:

https://doi.org/10.21423/aabppro20015235

Keywords:

Neospora caninum, time until culling, culling risk, parasite, abortion

Abstract

Neospora caninum is a protozoan parasite that is an important cause of abortion in cattle. To determine the economic impact of N. caninum on the dairy industry it is necessary to consider both the direct effect of infection, such as abortion, and potential indirect effects such as altered milk production, reproductive performance and culling. One study involving a large California dairy herd showed that seropositive first lactation cows are at greater risk of being culled than seronegative first lactation cows. However, it is unclear whether this increased risk of culling applies to all parity groups and all dairy herds with seropositive animals. The objective of the present study was to determine if N. caninum serological status in Ontario Holsteins is associated with time until culling and risk of being culled.

Cover image of the 34th Conference Proceedings: Four men on horseback lead a single cow through a pen. Yellow background.

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Published

2020-03-13

Issue

2001

Section

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