Johne's Disease in Sheep

Seaman, J. T.; Gardner, Ian A.; Dent, C. H. R.

doi:10.1111/j.1751-0813.1981.tb00465.x

Cited by 31 publications

(12 citation statements)

References 4 publications

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“…1 Since that time it has spread progressively either through movement of sheep or from separate introductions from overseas, so that by December 2000 more than 850 infected flocks had been reported in five of Australia's seven States. 2 Despite this, there are still large areas of Australia where the disease has never been diagnosed, or has been seen only in introduced sheep.…”

mentioning

confidence: 99%

The estimated prevalence of Johne's disease infected sheep flocks in Australia

Sergeant

Baldock

2002

Aust Veterinary J

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This study suggests that OJD has a highly clustered distribution in Australia, and provides estimates of the prevalence of infected flocks by State or region. Based on this analysis there were probably between 2000 and 3700 infected flocks in Australia at 31 December 2000, with more than 80% of these in a relatively small geographic area of central and southern New South Wales. Some States, such as Queensland and Western Australia, may have a prevalence equal or close to 0%, however the technique used was unable to demonstrate the absence of infection in these States with the intensity of surveillance undertaken to date.

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confidence: 99%

The estimated prevalence of Johne's disease infected sheep flocks in Australia

Sergeant

Baldock

2002

Aust Veterinary J

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“…A lthough first diagnosed in Australia in 1980, 1 ovine Johne's disease (OJD) did not become an industry issue until the early 1990s, when producers in the tablelands region of NSW began reporting significant mortalities from the disease in their long term infected Merino flocks. Following a call from some industry sectors to attempt to eradicate the disease by de‐stocking infected flocks, a 6‐year National OJD Program (NOJDP) was started in 1999 with the aim of determining the best methods for managing the disease at both the flock and industry level.…”

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confidence: 99%

Lesions attributed to vaccination of sheep with Gudair™ for the control of ovine paratuberculosis: post farm economic impacts at slaughter

Eppleston¹,

Windsor

2007

Aust Veterinary J

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“…paratuberculosis (MAP), is characterised by progressive emaciation and intermittent diarrhoea in some animals. It was first reported among sheep in Australia in the early 1980s (Seaman et al, 1981). By December 2005, 1840 flocks were reported infected, mostly in the state of New South Wales (NSW) (Kennedy and Sergeant, 2005).…”

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Risk factors for ovine Johne's disease in infected sheep flocks in Australia

Dhand

Eppleston

Whittington

et al. 2007

Preventive Veterinary Medicine

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We conducted a cross-sectional study in 2004-05 to investigate risk factors for ovine Johne's disease (OJD) involving 92 infected Merino sheep flocks in Australia. In each enrolled flock we collected pooled faecal-samples from 3-to 5-year-old sheep and cultured them for Mycobacterium avium subsp. paratuberculosis (MAP) to determine their OJD status. Based on pooled faecal-culture (PFC) results, three outcome variables representing different facets of disease biology were derived: pool OJD status (binomial: positive or negative), log pool MAP number (continuous) and cohort OJD prevalence level (ordinal: low (<2%), medium (2-10%) and high (>10%) prevalence). We used these outcomes in three separate multivariable analyses to identify risk factors, which were based on a questionnaire administered during a face-to-face interview with the farmer.We found higher OJD infection in sheep whose dams had been in poor condition and kept at a high stocking rate during lambing and in sheep which had experienced a longer period of growth retardation during their lifetime. Flocks that had vaccinated for >2 years (rather than only 1 to 2 years) with a killed MAP vaccine had significantly lower OJD infection. In addition, practices including culling low body-weight sheep or selling sub-flocks experiencing high losses, sharing of roads between neighbouring farms, and greater frequency of application of super-phosphate fertilizers were associated with higher OJD. Of the confounders investigated, infection was higher in flocks experiencing high mortalities; in wethers compared to ewes; and in 3-year-old sheep compared to 4-year-old sheep.

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Johne's Disease in Sheep

Cited by 31 publications

References 4 publications

The estimated prevalence of Johne's disease infected sheep flocks in Australia

The estimated prevalence of Johne's disease infected sheep flocks in Australia

Lesions attributed to vaccination of sheep with Gudair™ for the control of ovine paratuberculosis: post farm economic impacts at slaughter

Risk factors for ovine Johne's disease in infected sheep flocks in Australia

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