alexa Prevalence of and carcass condemnation from maedi-visna, paratuberculosis and caseous lymphadenitis in culled sheep from Quebec, Canada.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Arsenault J, Girard C, Dubreuil P, Daignault D, Galarneau JR,

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Abstract We determined the prevalence of lung and mammary gland lesions associated with maedi-visna (MV) infection, the prevalence of paratuberculosis (PTB), and the prevalence and lesions distribution of caseous lymphadenitis (CL) in culled sheep. Total of 451 ewes and 34 rams were selected randomly from two slaughterhouses in Quebec, Canada. MV serostatus was determined by recombinant ELISA test. PTB diagnosis was based on characteristic histological lesions in the terminal ileum, ileocecal lymph node and/or ileocecal valve and CL by gross detection of abscesses and isolation of Corynebacterium pseudotuberculosis. Seroprevalence of MV was 44\% (95\% CI: 40, 48). Seropositivity increased with age and was higher in ewes than in rams. The percentages of lung and mammary gland lesions in seropositive sheep were 14 and 40\%, respectively, but mammary gland lesions lack specificity. The prevalence of PTB was 3\% (95\% CI: 2, 5). PTB increased with age and was lower among sheep with abscesses. The prevalence of CL was >/=21\% (95\% CI: 17, 24). The most-prevalent site of caseous lymphadenitis lesions was the thoracic cavity. The risk of carcass condemnation was significantly associated with region, body score and abscesses. Only the presence of abscesses was associated with an increase in trimming of carcasses.
This article was published in Prev Vet Med and referenced in Journal of Clinical & Cellular Immunology

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