Neospora caninum and reproductive wastage in extensively managed Queensland beef herds

Fordyce, G., Holroyd, R. G., Taylor, J. and Kirkland, P. D. (2013) Neospora caninum and reproductive wastage in extensively managed Queensland beef herds. Australian Veterinary Journal, 91 9: 385-390. doi:10.1111/avj.12097

Author Fordyce, G.
Holroyd, R. G.
Taylor, J.
Kirkland, P. D.
Title Neospora caninum and reproductive wastage in extensively managed Queensland beef herds
Journal name Australian Veterinary Journal   Check publisher's open access policy
ISSN 0005-0423
Publication date 2013-09
Year available 2013
Sub-type Article (original research)
DOI 10.1111/avj.12097
Open Access Status
Volume 91
Issue 9
Start page 385
End page 390
Total pages 6
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell
Collection year 2014
Language eng
Formatted abstract
To compare reproduction in extensively managed, tropically adapted beef cows that were either seropositive or seronegative to Neospora caninum.

Longitudinal study of cows within management groups.

Compare pregnancy with weaning outcomes for 502 seropositive and 3255 seronegative cows in 25 management groups.

We found N. caninum in all herds, with an average of 20% of 2640 tested animals seropositive within management group; prevalence varied between 0% and 94%. At 7 of 10 sites assessed, there was evidence of horizontal transmission of N. caninum. There was no overall difference in pregnancy rate (79% vs 75%; P > 0.05), reproductive wastage after confirmed pregnancy diagnosis (11% vs 10%; P > 0.05) or weaning rate (67% vs 68%; P > 0.05) between seronegative and seropositive cows, respectively. In one herd where a combination of risk factors for N. caninum was present, a significant reduction in pregnancy rate occurred after the 6 months mating (85% vs 69%; P < 0.05). The fetal and calf losses observed were lowest in south-east Queensland (4.3% of 117 pregnancies), highest in north-west Queensland (15.5% of 413 pregnancies) and intermediate in north-east Queensland (10.2% of 1625 pregnancies). Other infectious agents that are known to cause reproductive wastage were endemic in many herds, though none appeared to cause significant fetal or calf loss in this study.

Despite a high prevalence of N. caninum, there was no apparent effect on beef cattle reproduction, but there is potential to cause reproductive wastage if known risk factors to neosporosis are in effect.
Keyword Abortion
Beef cattle
Calf loss
Neospora caninum
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Author's prepub title: "Neospora caninum and reproductive wastage in extensive Queensland beef herds".

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 1 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 1 times in Scopus Article | Citations
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