title: Prevalence of and carcass condemnation from maedi-visna, paratuberculosis and caseous lymphadenitis in culled sheep from Quebec, Canada.
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.
authors.affiliation: Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Rue Sicotte, C.P. 5000, Quebec, J2S 7C6, Saint-Hyacinthe, Canada. julie.arsenault@umontreal.ca
authors.forename: Julie
authors.initials: J
authors.lastname: Arsenault
authors.forename: Christiane
authors.initials: C
authors.lastname: Girard
authors.forename: Pascal
authors.initials: P
authors.lastname: Dubreuil
authors.forename: Danielle
authors.initials: D
authors.lastname: Daignault
authors.forename: Jean René
authors.initials: JR
authors.lastname: Galarneau
authors.forename: Julie
authors.initials: J
authors.lastname: Boisclair
authors.forename: Carole
authors.initials: C
authors.lastname: Simard
authors.forename: Denise
authors.initials: D
authors.lastname: Bélanger
mesh_terms: D000003:Abattoirs; D000038:Abscess / Q000382:microbiology; D000367:Age Factors; D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D016925:Corynebacterium pseudotuberculosis; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D016015:Logistic Models; D008168:Lung / Q000821:virology; D008199:Lymphadenitis / Q000453:epidemiology / Q000662:veterinary*; D008321:Mammary Glands, Animal / Q000821:virology; D010283:Paratuberculosis / Q000453:epidemiology*; D011021:Pneumonia, Progressive Interstitial, of Sheep / Q000097:blood / Q000453:epidemiology*; D015995:Prevalence; D011792:Quebec / Q000453:epidemiology; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology*; D035423:Thoracic Cavity / Q000382:microbiology; D014790:Visna-maedi virus / Q000302:isolation & purification
chemical_list: D000914:Antibodies, Viral