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Bovine coronavirus and bovine respiratory syncytial virus infections in dairy herds prospects for control

prospects for control

Ohlson, Anna (2010). Bovine coronavirus and bovine respiratory syncytial virus infections in dairy herds prospects for control. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2010:51
ISBN 978-91-576-7464-7
[Doctoral thesis]

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Bovine coronavirus (BCV) and bovine respiratory syncytial virus (BRSV) are significant causes of enteric and respiratory disease in cattle throughout the world.The aim of this thesis was to gain further knowledge of the epidemiology of these infections in Swedish dairy herds. Two studies were conducted of the association between BCV/BRSV antibody status and health and performance, on herd (79 herds) and individual animal level(65 herds). The analyses were carried out using survival, linear regression, and logistic regression models. Herds that were antibody-positive to BCV and/or BRSV had higher bulk tank milk (BTM) somatic cell count than herds negative to both BCV and BRSV. Cows in herds with recent BRSV infection had a lower milk yield than cows in BRSV-free herds, and cows in herds with clinical signs of BRSV infection had a higher somatic cell count than cows in herds without clinical signs. In the third study, the effect of herd-level risk factors on antibody status was quantified in 257 herds using logistic regression models and spatial analysis. Large herd size, being located in southern Sweden, and not providing boots for visitors were found to be associated with antibody positivity to BCV and BRSV, while short distance to nearest cattle herd was additionally associated with positivity to BCV.Providing boots for visitors likely reflects herds with a high level of biosecurity measures. Neither BCV-positive nor BRSV-positive herds were spatially clustered, indicating that local spread and airborne transmission are not of great importance. The fourth study investigated the long-term dynamics of BCV and BRSV infections in 20 herds from each of two southern and two northern areas. There was a high prevalence of BCV and BRSV amongst the herds in the southern areas,and a lower prevalence in the northern areas; one of the latter was free from BRSV at the end of the study. There was also self-clearance of BCV and BRSV, manifesting as conversion from antibody positive to negative in pooled milk samples and BTM. The results of this thesis suggest that it is possible to develop inexpensive strategies for controlling BCV and BSRV infections, based on biosecurity and antibody monitoring. Such a control strategy would improve cattle and calf health.

Authors/Creators:Ohlson, Anna
Title:Bovine coronavirus and bovine respiratory syncytial virus infections in dairy herds prospects for control
Subtitle:prospects for control
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2010
Number of Pages:60
I.Ohlson, A. Emanuelson, U., Tråvén, M., Alenius, S.(2010). The relationship between antibody status to bovine corona virus and bovine respiratory syncytial virus and disease incidence, reproduction and herd characteristics in dairy herds. Acta Veterinaria Scandinavica 53:37.
II.Beaudeau, F., Ohlson, A., Emanuelson, U. (2010). Associations between bovine coronavirus and bovine respiratory syncytial virus infections and animal performance in Swedish dairy herds. Journal of Dairy Sciences 93 (4), 1523-1533.
III.Ohlson, A., Heuer, C., Lockhart, C., Tråvén, M., Emanuelson, U., Alenius, S. (2010). Risk factors for seropositivity to bovine coronavirus and bovine respiratory syncytial virus in dairy herds. Veterinary Record Aug 7; 167(6): 201-6.
IV.Ohlson, A. Tråvén, M., Emanuelson, U., Alenius, S. (2010). A longitudinal study of the dynamics of bovine coronavirus and bovine respiratory syncytial virus infections in dairy herds (submitted).
Place of Publication:Uppsala
Publisher:Department of Clinical Sciences, Swedish University of Agricultural Sciences
Associated Programs and Other Stakeholders:SLU - Research Areas for the Future > Future Animal Health and Welfare (until Jan 2017)
ISBN for printed version:978-91-576-7464-7
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:coronaviridae, pneumovirus, cattle, animal performance, disease control
Keywords:BCV, BRSV, antibody detection, performance, biosecurity, cattle, control, herd health, risk factors, spatial correlation
Permanent URL:
ID Code:2351
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Clinical Sciences
Deposited By: Anna Ohlson
Deposited On:20 Sep 2010 00:00
Metadata Last Modified:02 Dec 2014 10:17

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