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Título

Influence of flock management on helminth eggs passage in faeces of sheep in León province (NW Spain)

AutorFerre, Ignacio; García-Pérez, A. L.; López, Javier ; Lavín, Paz ; Giráldez, Francisco Javier ; Mantecón, Ángel R.
Palabras claveHelminth eggs
Faeces
Sheep
León (NW Spain)
Fecha de publicación1995
CitaciónWorld Sheep and Wool Congress, Paper 3.1.4. (1995)
ResumenThe relationship between flock management and faecal output of helminth eggs in sheep (Churra-Assaf cross breed) from nine representative farms in León province (NW Spain) were studied. Throughout 1994, 1485 faecal samples were taken every three months from sheep at different produtive stages (growing lambs and non-productive, lambing or milking ewes). Three grazing systems were considered: irrigate, unirrigate and mixed (2, 4 and 3 farms, respectively). Body condition score were also recorded in all sheep sampled. Faecal samples were analysed by a standard flotation method using McMaster chambers and potassium iodine mercuriate as dense solution. Gastrointestinal nematodes (Strongylida) (70%) and Dicrocoelium dendriticum (52%) infection showed the higher prevalences. Other helminths were also found, but with less prevalence, like lungworms (31%), Trichuris spp. (18%), Moniezia spp. (16%), Fasciola hepatica (7%) and Capillaria spp. (0.2%). Strongylida identified by coproculture were Ostertagia spp. (62%), Trichostrongylus spp. (43%), Nematodirus spp. (18%), Chabertia ovina (11%) and Cooperia spp. (0.33%). There were seasonal variations in helminth eggs output, with higher values in autumn and winter for strongylids, in winter and spring for D. dendriticum and in autumn for F. hepatica. The mean number of D. dendriticum eggs eliminated by infected sheep was significantly increased in unirrigated systems, but F. hepatica eggs output was significantly higher in irrigated ones. Sheep from mixed grazing system eliminated the greatest number of strongylate eggs in faeces. Lambs showed lesser elimination of strongylate and D. dendriticum eggs than older sheep, because they were housed. In contrast, ewes showed the highest number of strongylate eggs passed in faeces, caused by the periparturient relaxation of immunity. A significant negative correlation was found between body condition and strongylate and D. dendriticum eggs output. It suggest that a low level of nutrition could reduce the host resistance to gastrointestinal parasitism. Usually, anthelmintic treatments are administered twice a year (spring and autumn), reducing temporarily helminth eggs output. Control strategies based in farm management will be proposed.
Descripción8 pages, 3 tables, 2 figures.-- Contributed to: World Sheep and Wool Congress (Malvern, Reino Unido, 1995).
URIhttp://hdl.handle.net/10261/20572
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