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The ked Melophagus ovinus (L.), one of the most common obligate external parasites in sheep, is a recurrent problem in temperate sheep production areas worldwide. Modeling of its annual dynamics, which is lacking, can contribute to delineate integrated management strategies. We sampled ked density along a one-year period in two sheep farms of Northwest Patagonia, Argentina. In one farm with semi-intensive sheep management, we sampled 20 lambs and 10 adult [ver mas...]
dc.contributor.authorLarroza, Marcela Patricia
dc.contributor.authorAparicio, Alejandro Gabriel
dc.contributor.authorRaffo, Fernando
dc.contributor.authorCabrera, Raúl Francisco
dc.contributor.authorOlaechea, Fermin
dc.date.accessioned2018-03-20T18:19:50Z
dc.date.available2018-03-20T18:19:50Z
dc.date.issued2018-03
dc.identifier.issn0921-4488
dc.identifier.otherhttps://doi.org/10.1016/j.smallrumres.2018.01.002
dc.identifier.urihttp://hdl.handle.net/20.500.12123/2087
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0921448818300051#!
dc.description.abstractThe ked Melophagus ovinus (L.), one of the most common obligate external parasites in sheep, is a recurrent problem in temperate sheep production areas worldwide. Modeling of its annual dynamics, which is lacking, can contribute to delineate integrated management strategies. We sampled ked density along a one-year period in two sheep farms of Northwest Patagonia, Argentina. In one farm with semi-intensive sheep management, we sampled 20 lambs and 10 adult Corriedale-cross sheep naturally parasitized prior to our study. In a second farm with extensive management, we sampled 10 Merino lambs, which we artificially infested in early autumn. We fitted bell-shaped curves to describe the annual ked population dynamics in each animal group and used global fitting to compare the models. In the two-cohort flock, the peak ked density in lambs was almost two-fold higher (Nmax=186 vs. 86) and occurred 1.5 months earlier (early August) than that in adult sheep; time span parameter was equal in both curves (SD≈64 days). In the artificially parasitized lambs, the ked population showed a ca. five-month lag period, after which density increased sharply to a peak of Nmax=155, reached well into spring (late October); the span of the model was SD=38 days. Based on the ked annual cycles modeled and considering the traditional sheep management practices, we suggest monitoring flocks at least twice a year: at pre-mating in mid-autumn and at the annual shearing in spring (pre-lambing shearing or traditional shearing). Ked detection and treatment at pre-mating can prevent keds from entering the exponential phase and the consequent sanitary and economic impacts. In case keds are detected, treatment after pre-lambing shearing may prevent infestation of newborn lambs. Monitoring at traditional shearing is also an opportunity for ked detection, although it could be hard since ked populations will be in a phase of advanced decline in both adult and young sheep. Future works that statistically model the annual population dynamics of keds, under well-defined conditions, may allow meta-analyses of the behavior of this widely distributed plague, especially under the accelerating climate and agricultural changes worldwide.eng
dc.formatapplication/pdfeng
dc.language.isoeng
dc.rightsinfo:eu-repo/semantics/restrictedAccesseng
dc.sourceSmall ruminant research 160 : 19-22. (March 2018)
dc.subjectMelophagus Ovinus
dc.subjectOvinos
dc.subjectSheepeng
dc.subjectParásitos
dc.subjectParasiteseng
dc.subject.otherPiojo de la Oveja
dc.subject.otherRegión Patagónica
dc.titleModeling of the annual cycle of Melophagus Ovinus (L.) in two sheeps flocks of Patagonia, Argentinaeng
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/articleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.description.origenEEA Bariloche
dc.gic156628
dc.description.filFil: Larroza, Marcela Patricia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo Salud Animal; Argentina
dc.description.filFil: Aparicio, Alejandro Gabriel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina
dc.description.filFil: Raffo, Fernando. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina
dc.description.filFil: Cabrera, Raul Francisco. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo Salud Animal; Argentina
dc.description.filFil: Olaechea, Fermin. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo Salud Animal; Argentina
dc.subtypecientifico


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