Modeling of the annual cycle of Melophagus Ovinus (L.) in two sheeps flocks of Patagonia, Argentina
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 a...
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| Format: | info:ar-repo/semantics/artículo |
| Language: | Inglés |
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2018
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| Online Access: | http://hdl.handle.net/20.500.12123/2087 https://www.sciencedirect.com/science/article/pii/S0921448818300051#! https://doi.org/10.1016/j.smallrumres.2018.01.002 |
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| author | Larroza, Marcela Patricia Aparicio, Alejandro Gabriel Raffo, Fernando Cabrera, Raúl Francisco Olaechea, Fermin |
| author_browse | Aparicio, Alejandro Gabriel Cabrera, Raúl Francisco Larroza, Marcela Patricia Olaechea, Fermin Raffo, Fernando |
| author_facet | Larroza, Marcela Patricia Aparicio, Alejandro Gabriel Raffo, Fernando Cabrera, Raúl Francisco Olaechea, Fermin |
| author_sort | Larroza, Marcela Patricia |
| collection | INTA Digital |
| description | 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. |
| format | info:ar-repo/semantics/artículo |
| id | INTA2087 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| record_format | dspace |
| spelling | INTA20872019-03-21T18:43:18Z Modeling of the annual cycle of Melophagus Ovinus (L.) in two sheeps flocks of Patagonia, Argentina Larroza, Marcela Patricia Aparicio, Alejandro Gabriel Raffo, Fernando Cabrera, Raúl Francisco Olaechea, Fermin Melophagus Ovinus Ovinos Parásitos Sheep Parasites Piojo de la Oveja Región Patagónica 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. EEA Bariloche Fil: Larroza, Marcela Patricia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo Salud Animal; Argentina Fil: Aparicio, Alejandro Gabriel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina Fil: Raffo, Fernando. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina Fil: Cabrera, Raul Francisco. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo Salud Animal; Argentina Fil: Olaechea, Fermin. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo Salud Animal; Argentina 2018-03-20T18:19:50Z 2018-03-20T18:19:50Z 2018-03 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/2087 https://www.sciencedirect.com/science/article/pii/S0921448818300051#! 0921-4488 https://doi.org/10.1016/j.smallrumres.2018.01.002 eng info:eu-repo/semantics/restrictedAccess application/pdf Small ruminant research 160 : 19-22. (March 2018) |
| spellingShingle | Melophagus Ovinus Ovinos Parásitos Sheep Parasites Piojo de la Oveja Región Patagónica Larroza, Marcela Patricia Aparicio, Alejandro Gabriel Raffo, Fernando Cabrera, Raúl Francisco Olaechea, Fermin Modeling of the annual cycle of Melophagus Ovinus (L.) in two sheeps flocks of Patagonia, Argentina |
| title | Modeling of the annual cycle of Melophagus Ovinus (L.) in two sheeps flocks of Patagonia, Argentina |
| title_full | Modeling of the annual cycle of Melophagus Ovinus (L.) in two sheeps flocks of Patagonia, Argentina |
| title_fullStr | Modeling of the annual cycle of Melophagus Ovinus (L.) in two sheeps flocks of Patagonia, Argentina |
| title_full_unstemmed | Modeling of the annual cycle of Melophagus Ovinus (L.) in two sheeps flocks of Patagonia, Argentina |
| title_short | Modeling of the annual cycle of Melophagus Ovinus (L.) in two sheeps flocks of Patagonia, Argentina |
| title_sort | modeling of the annual cycle of melophagus ovinus l in two sheeps flocks of patagonia argentina |
| topic | Melophagus Ovinus Ovinos Parásitos Sheep Parasites Piojo de la Oveja Región Patagónica |
| url | http://hdl.handle.net/20.500.12123/2087 https://www.sciencedirect.com/science/article/pii/S0921448818300051#! https://doi.org/10.1016/j.smallrumres.2018.01.002 |
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