Ovine Johne's disease in NSW Australia: A decade of abattoir monitoring and vaccination (1999-2009)

Ian Links, L Denholm, M Evers, L Kingham, R Greenstein

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Abstract

Ovine Johne's disease in NSW Australia - A decade of abattoir monitoring and vaccination (1999-2009) Links, I J 1, Denholm, L J2, Evers, M3, Kingham, L3, Greenstein, R J41 EH Graham Centre for Agricultural Innovation, Wagga Wagga, NSW 2650 Australia2 NSW Department of Trade and Investment, Orange, NSW Australia3 NSW Department of Primary Industries, Orange, NSW Australia 4 JJP Veterans Affairs Medical Center Bronx, NY, USAAIM: Mycobacterium avium subspecies paratuberculosis “sheep strainâ€� is the cause of ovine Johne’s disease (OJD). OJD was first detected in New South Wales (NSW), in 1980 and subsequently became prevalent in higher rainfall sheep-raising areas of NSW (Central and Southern Slopes). By 2000 a numbers of flocks were reporting annual mortalities exceeding 5%. Abattoir monitoring for OJD was instituted in NSW in 1999 as part of a national program. Vaccination of lambs and adult sheep with Gudair® killed vaccine (Pfizer Animal Health) was permitted from January 2000. Concurrently producers were encouraged to implement property disease management plans (PDMPs). We review the outcomes from abattoir monitoring and vaccination in NSW from 1999-2009. METHODS: Prevalence of OJD was stratified into “Highâ€� “Mediumâ€� and “Lowâ€� areas (HPA, MPA and LPA) at 31st March 2008. Trained inspectors evaluated carcasses of adult sheep for gross evidence of OJD in the lower small intestine. Suspect tissue was subjected to histopathological examination. Monitoring results were reported to the producer.RESULTS: From 2000-2009, 12 million vaccinations were administered (91%; 10.9 million in the HPA). A total of 7.6 million carcasses (76% of sheep killed in 32,032 consignments) were examined (38%; 2.9 million from the HPA). From 2000-2009, 16% of all consignments were positive for OJD, of which 94% were from the HPA.The annual percentage of positive consignments from the HPA remained above 23% from 1999-2009 (average 37%, maximum 47% in 2006). In contrast, the p
Original languageEnglish
Publication statusPublished - 2013
EventInternational Sheep Veterinary Congress (ISVC) - Rotorua, New Zealand, New Zealand
Duration: 18 Feb 201322 Feb 2013

Conference

ConferenceInternational Sheep Veterinary Congress (ISVC)
Country/TerritoryNew Zealand
Period18/02/1322/02/13

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