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abdomen adult Africa anaemia animals anteriorly bears become birds blood blowflies body buccal capsule bursa caeca carbon tetrachloride cattle cause cavity cent cercariae chitinous colour contain cuticle Cysticercus cysts develop Diagnosis dipping disease doses drug ducts effective eggs measure elongate emaciation engorge faeces Fasciola hepatica feed female final host flies fowl frequently genital pore Genus glands goats haemorrhagic hatch heavy infections hind end hooks infective larvae ingested intermediate hosts known large number larvae legs lesions life-cycle Life-Cycle.—The eggs liver lobed lungs male bursa mites moult mucosa nodules nymphs occurs oesophagus organs ORIGINAL ovary pair papillae parasites passed Pathogenicity pharynx posterior posteriorly proboscis produce Railliet scolex segments sheep skin small intestine snails species spicules spines stage stomach Strongylus suitable surface symptoms Symptoms.—The tail tapeworms temperature tick tissue transmits treatment Trichostrongylus usually uterus ventral sucker VENTRAL VIEW vulva wall worms