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Bovine fascioliasis in the Manawatu: epidemiology and farmer awareness.

The prevalence of Fasciola hepatica was found to be 5.1% in slaughtered cattle originating from the Palmerston North Veterinary District. Approximately 4% of beef breeding, 7% of dairy and 21% of drystock herds showed evidence of infection. Of 34 dairy herd and 14 beef breeding herd owners, 0 and 21% respectively were aware of the presence of fluke on their properties. Distribution of affected dairy farms conformed with the ecological requirements of the intermediate host Lymnaea columella. The high prevalence of infection in drystock herds is consistent with the extensive movements known to occur into these herds from liver fluke-affected parts of the country. In view of the expanding geographical range of Fasciola hepatica and its intermediate host Lymnaea columella, farmers should be alerted to the potential risks that result from the introduction of infected cattle to properties which contain suitable habitats for the snail.