A stochastic model to investigate the effects of control strategies on calves exposed to Ostertagia ostertagi.
Parasitology
; 143(13): 1755-1772, 2016 11.
Article
en En
| MEDLINE
| ID: mdl-27573532
Predicting the effectiveness of parasite control strategies requires accounting for the responses of individual hosts and the epidemiology of parasite supra- and infra-populations. The first objective was to develop a stochastic model that predicted the parasitological interactions within a group of first season grazing calves challenged by Ostertagia ostertagi, by considering phenotypic variation amongst the calves and variation in parasite infra-population. Model behaviour was assessed using variations in parasite supra-population and calf stocking rate. The model showed the initial pasture infection level to have little impact on parasitological output traits, such as worm burdens and FEC, or overall performance of calves, whereas increasing stocking rate had a disproportionately large effect on both parasitological and performance traits. Model predictions were compared with published data taken from experiments on common control strategies, such as reducing stocking rates, the 'dose and move' strategy and strategic treatment with anthelmintic at specific times. Model predictions showed in most cases reasonable agreement with observations, supporting model robustness. The stochastic model developed is flexible, with the potential to predict the consequences of other nematode control strategies, such as targeted selective treatments on groups of grazing calves.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ostertagiasis
/
Ostertagia
/
Enfermedades de los Bovinos
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Control de Infecciones
/
Interacciones Huésped-Parásitos
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Parasitology
Año:
2016
Tipo del documento:
Article
Pais de publicación:
Reino Unido