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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
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dc.contributor.author | Larroza, Marcela Patricia | |
dc.contributor.author | Aparicio, Alejandro Gabriel | |
dc.contributor.author | Raffo, Fernando | |
dc.contributor.author | Cabrera, Raúl Francisco | |
dc.contributor.author | Olaechea, Fermin | |
dc.date.accessioned | 2018-03-20T18:19:50Z | |
dc.date.available | 2018-03-20T18:19:50Z | |
dc.date.issued | 2018-03 | |
dc.identifier.issn | 0921-4488 | |
dc.identifier.other | https://doi.org/10.1016/j.smallrumres.2018.01.002 | |
dc.identifier.uri | http://hdl.handle.net/20.500.12123/2087 | |
dc.identifier.uri | https://www.sciencedirect.com/science/article/pii/S0921448818300051#! | |
dc.description.abstract | 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 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.format | application/pdf | eng |
dc.language.iso | eng | |
dc.rights | info:eu-repo/semantics/restrictedAccess | eng |
dc.source | Small ruminant research 160 : 19-22. (March 2018) | |
dc.subject | Melophagus Ovinus | |
dc.subject | Ovinos | |
dc.subject | Sheep | eng |
dc.subject | Parásitos | |
dc.subject | Parasites | eng |
dc.subject.other | Piojo de la Oveja | |
dc.subject.other | Región Patagónica | |
dc.title | Modeling of the annual cycle of Melophagus Ovinus (L.) in two sheeps flocks of Patagonia, Argentina | eng |
dc.type | info:ar-repo/semantics/artículo | |
dc.type | info:eu-repo/semantics/article | eng |
dc.type | info:eu-repo/semantics/publishedVersion | eng |
dc.description.origen | EEA Bariloche | |
dc.gic | 156628 | |
dc.description.fil | Fil: Larroza, Marcela Patricia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo Salud Animal; Argentina | |
dc.description.fil | Fil: Aparicio, Alejandro Gabriel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina | |
dc.description.fil | Fil: Raffo, Fernando. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina | |
dc.description.fil | Fil: Cabrera, Raul Francisco. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo Salud Animal; Argentina | |
dc.description.fil | Fil: Olaechea, Fermin. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo Salud Animal; Argentina | |
dc.subtype | cientifico |
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