Prevalence of Johne's disease among cattle in Orkney

Beasley, Laura J.; Truyers, Isabelle; Mellor, D. J.; Norquay, Rhona; Duthie, Susan J.; Ellis, Kathryn

doi:10.1136/vr.d891

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Although, at an animal level, the percentage of positive tests is relatively low and it is important to consider the limitations of the antibody ELISA with low sensitivity, particularly in the early stages of the disease; hence, not all infected animals are uncovered. Therefore, several studies have suggested that their herd prevalence estimates are likely to be underestimated (Woodbine et al, 2009;Beasley et al, 2011). In another UK study, 2.5% of dairy cows (≥3 yr old) were ELISA-positive and 65% of herds had at least 1 ELISA-positive cow (Anon, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…Until recently, reliable national disease data in the UK have been scarce (Bennett and Ijpelaar, 2005), and studies on the effect of paratuberculosis that require prevalence estimates or the magnitude of efficiency losses have been confined to small geographical regions (Woodbine et al, 2009;Beasley et al, 2011) or based their assumptions on estimates from other countries. To a certain degree, losses associated with paratuberculosis are related to the production system; therefore, results obtained in one country may not necessarily be applied to another.…”

Section: Introductionmentioning

confidence: 99%

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Phenotypic effects of subclinical paratuberculosis (Johne’s disease) in dairy cattle

Pritchard

Coffey

Bond

et al. 2017

Journal of Dairy Science

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The effect of subclinical paratuberculosis (or Johne's disease) risk status on performance, health, and fertility was studied in 58,096 UK Holstein-Friesian cows with 156,837 lactations across lactations 1 to 3. Low-, medium-, and high-risk group categories were allocated to cows determined by a minimum of 4 ELISA milk tests taken at any time during their lactating life. Lactation curves of daily milk, protein, and fat yields and protein and fat percentage, together with log-transformed somatic cell count, were estimated using a random regression model to quantify differences between risk groups. The effect of subclinical paratuberculosis risk groups on fertility, lactation-average somatic cell count, and mastitis were analyzed using linear regression fitting risk group as a fixed effect. Milk yield losses associated with high-risk cows compared with low-risk cows in lactations 1, 2, and 3 for mean daily yield were 0.34, 1.05, and 1.61kg; likewise, accumulated 305-d yields were 103, 316, and 485kg, respectively. The total loss was 904kg over the first 3 lactations. Protein and fat yield losses associated with high-risk cows were significant, but primarily a feature of decreasing milk yield. Similar trends were observed for both test-day and lactation-average somatic cell count measures with higher somatic cell counts from medium- and high-risk cows compared with low-risk cows, and differences were in almost all cases significant. Likewise, mastitis incidence was significantly higher in high-risk cows compared with low-risk cows in lactations 2 and 3. Whereas the few significant differences between risk groups among fertility traits were inconsistent with no clear trend. These results are expected to be conservative, as some animals that were considered negative may become positive after the timeframe of this study, particularly if the animal was tested when relatively young. However, the magnitude of milk yield losses together with higher somatic cell counts and an increase in mastitis incidence should motivate farmers to implement the appropriate control measures to reduce the spread of the disease.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phenotypic effects of subclinical paratuberculosis (Johne’s disease) in dairy cattle

Pritchard

Coffey

Bond

et al. 2017

Journal of Dairy Science

View full text Add to dashboard Cite

show abstract

“…By comparing a nationally intensive study focusing on soil (this study) with local intensive monitoring in rivers (Wyre and Douglas, this study and Taff/Tywi (Pickup et al ., 2005; 2006), we can conclude that river water sampling in a defined catchment best describes the degree of endemic infection within those animals rather than randomized soil sampling. Furthermore, Johne's disease in the Orkney Isles (GB) is highly prevalent (Herd prevalence is 64.5% with an individual animal prevalence of 3.6% (Beasley et al ., ) yet the four out of five CS2007 samples were negative, therefore we would predict that river sampling would be a more relevant predictor of M. avium ssp. paratuberculosis contamination of the land.…”

Section: Discussionmentioning

confidence: 99%