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Bovine respiratory syncytial virus and bovine coronavirus in Swedish organic and conventional dairy herds

Wolff, Cecilia and Emanuelson, Ulf and Ohlson, Anna and Alenius, Stefan and Fall, Nils (2015). Bovine respiratory syncytial virus and bovine coronavirus in Swedish organic and conventional dairy herds. Acta veterinaria Scandinavica. 57:2, 1-7
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Official URL: http://dx.doi.org/10.1186/s13028-014-0091-x

Abstract

Background: Infections with bovine respiratory syncytial virus (BRSV) and bovine coronavirus (BoCV) are endemic to the cattle populations in most countries, causing respiratory and/or enteric disease. It has been demonstrated that herds can remain free from these infections for several years also in high prevalence areas. Organically managed (OM) dairy herds have been shown to have lower seroprevalence of both viruses compared to conventionally managed (CM) herds. The objective of this study was to challenge the hypothesis of a lower occurrence of BRSV and BoCV in OM compared to CM dairy herds. In November 2011, May 2012 and May 2013 milk samples from four homebred primiparous cows were collected in 75 to 65 OM and 69 to 62 CM herds. The antibody status regarding BRSV and BoCV was analysed with commercial indirect ELISAs. Herds were classified as positive if at least one individual sample was positive.Results: The prevalence of positive herds ranged from 73.4% to 82.3% for BRSV and from 76.8% to 85.3% for BoCV among OM and CM herds, over the three sampling occasions. There was no statistically significant difference between OM and CM herds at any sampling occasion. The incidence risk of newly infected herds did not differ statistically between OM and CM herds at any sampling occasion, neither for BRSV nor for BoCV. The incidence of herds turning sero-negative between samplings corresponded to the incidence of newly infected. Bulk tank milk (BTM) samples were also sampled in the herds and analysed. Several herds were negative on individual samples but positive in BTM. Herd-level data on production, health and reproduction were retrieved from VAXA Sweden and the study herds were representative of the source population.Conclusion: There was no difference in prevalence of or incidence risk for BRSV or BoCV between Swedish OM and CM herds. Because the incidence of herds becoming seropositive was balanced by herds becoming seronegative it should be possible to lower the prevalence of these two infections among Swedish dairy cattle herds if biosecurity is improved.

Authors/Creators:Wolff, Cecilia and Emanuelson, Ulf and Ohlson, Anna and Alenius, Stefan and Fall, Nils
Title:Bovine respiratory syncytial virus and bovine coronavirus in Swedish organic and conventional dairy herds
Series/Journal:Acta veterinaria Scandinavica (0044-605X)
Year of publishing :2015
Volume:57
Number:2
Page range:1-7
Number of Pages:7
Publisher:BioMed Central
ISSN:0044-605X
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:L Animal production > L70 Veterinary science and hygiene - General aspects
L Animal production > L73 Animal diseases
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Clinical Science
Agrovoc terms:cattle, diarrhoea, morbidity, disease prevention, sweden
Keywords:bovine respiratory disease, diarrhoea, cattle, disease prevalence, disease incidence, ELISA
URN:NBN:urn:nbn:se:slu:epsilon-e-2810
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2810
Additional ID:
Type of IDID
Web of Science (WoS)000347992600001
ID Code:12355
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Clinical Sciences
Deposited By: SLUpub Connector
Deposited On:29 Jul 2015 09:54
Metadata Last Modified:14 Feb 2016 08:03

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