Abstract
Extract Although phenothiazine and piperazine are widely used as anthelmintics for horses and both remove a high proportion of the small strongyles, Trichonema spp., neither is efficient in removing Strongylus vulgaris and S. edentatus, which are the most harmful, of the horse-infesting nematodes (Poynter, 1954 Poynter, D. 1954. Vet. Rec., 66: 101–101. [Google Scholar] , 1955 Poynter, D. 1955. Vet. Rec., 67: 159–159. [Google Scholar] ).

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