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In Portugal, cattle, sheep, goats, pigs and horses are generally treated once or twice a year (rarely 3 times a year) with anthelmintics. This is due to climatic conditions and the relatively low larval nematode burdens found on pastures. The major anthelmintics are benzimidazoles, but levamisole,...

Caeiro, V. M. P.
Directorate-General Information, Communication, Culture and Audiovisual, European Commission, Brussels, Belgium
Anthelmintic resistance in nematodes of farm animals. A seminar organised for the European Commission, held in Brussels, Belgium, from 8 to 9 November, 1993., 1994, pp 119-122