Producers were invited to submit adults and post-weaning animals (2 months or older) for necropsy that were found dead or had been euthanized for humane reasons (moribund state, pain, inability to stand, eat, or drink). Herd size varied from 19 to 618 adult animals (with a mean of 238 goats), for a total adult dairy goat and meat goat inventory of 3103 and 187 animals, respectively. This study was conducted from Jthrough and included a convenience sample of 13 goat herds (10 dairy and 3 meat), all but 1 located within a radius of 70 km from the Faculté de Médecine Vétérinaire’s diagnostic laboratory in St-Hyacinthe, Quebec. The purpose of this study was to investigate the causes of mortality in goats in some Quebec herds over a 1-year period, to report the proportion of necropsied goats with CLA, and establish CLA’s role in the mortality of those animals. Since withdrawal of the vaccine, several goat farmers have reported an increase in abscess development and subsequent culling. For these reasons, vaccination against CLA has decreased in Quebec.
Off-label vaccination of dairy goats with sheep vaccines has not proved efficacious and is advised, by the manufacturer, not to be used in goats because of safety issues. In Canada, vaccination against CLA in goats ended in 2006, after the withdrawal of the only vaccine approved for this species.
In North America, the prevalence and severity of diseases may vary greatly as Mexico, Oregon, and different regions of Canada do not necessarily share the same pathogens, herd management, and environmental factors.Ĭaseous lymphadenitis (CLA), caused by Corynebacterium pseudotuberculosis, is a common disease in North America which mainly affects sheep and goats and leads to abscessation in lymph nodes, skin, and internal organs. Information on several potentially lethal diseases of goats can also be found in the main textbooks on small ruminant medicine but their prevalence remains poorly documented ( 4– 6). Studies of goat mortality, often with emphasis on some specific causes of death, have been conducted in Mexico and in Oregon, USA ( 1– 3). In North America, and especially in Canada, the causes of death and their relative importance in goats are not well-documented. Au total, la paratuberculose a été diagnostiquée chez 29 chèvres (16 en étant décédées) et fut considérée comme une cause majeure de dépérissement et/ou de mortalité. Les abcès étaient localisés de façon interne dans 54,1 % des cas. La lymphadénite caséeuse a été diagnostiquée chez 24,3 % des chèvres soumises, mais sans être une cause majeure de dépérissement et de mortalité. Les mortalités proportionnelles furent distribuées ainsi : entérotoxémie de type D (17,1 %), pneumonie (13,8 %), paratuberculose (10,5 %), listériose (6,6 %), toxémie de gestation (5,3 %), arthrite-encéphalite caprine (4,6 %) et lymphadénite caséeuse (3,9 %). Cent-cinquante-deux chèvres provenant de 13 élevages différents ont été soumises pour nécropsie la cause de mortalité, la présence d’abcès, leur localisation et leur cause (s’il y a lieu) furent compilées. Les objectifs de cette étude furent de déterminer les principales causes de mortalité avec une attention particulière à la lymphadénite caséeuse comme cause de mortalité ou de dépérissement chez les chèvres du Québec. Mortalité proportionnelle: Une étude de 152 chèvres soumises pour nécropsie provenant de 13 élevages caprins du Québec, avec une attention particulière à la lymphadénite caséeuse.
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