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absent adult Africa America anthelmintic ascarids Babesia become birds bite blood blow-flies body bovis buccal capsule Bunostomum bursa carnivores cats cattle cause cavity cells cent common cuticle cysticercus cysts disease distribution dogs domestic animals dorsal doses drug effective eggs embryo equines faeces Fasciola feed female flies fluke forms genera Genital pore genus Habronema Haemonchus hatch helminths hooks hookworms horses hydatid important infective larvae intermediate host large number larvae larval stage lesions lice life-cycle live liver lungs male mammals manure membrane moult mouth capsule mucosa myiasis nematodes nodules occurs Oesophagostomum oesophagus organs oval ovary pair parasite pastures pathogenic Phenothiazine pigs posterior present produced protozoa resistance ruminants sclerostomes segments sheep similar single skin small intestine snail species spicules spray stain stomach strongyles swallowed symptoms tail tapeworms temperature tick tissue toxic treatment Trichostrongyles tropical trypanosomes usually uterus vector vulva worms yolk glands