| the distribution and abundance of parasitic infections in sheep grazing on irrigated or on non-irrigated pastures in north-eastern spain. | the parasitic output in faeces was studied in five sheep farms of zaragoza area (spain) during three years. two of them utilized irrigated pastures. the latter were characterized by a high prevalence of dicrocoelium lanceolatum, fasciola hepatica and protostrongylids. flood-irrigation did not interfere with digestive-tract strongyles and did not favour moniezia sp. infection. the heterogeneity of the parasitic output was more intense on irrigated pastures. | 1985 | 4091485 |