Livestock

Liver Fluke in Cattle: Welfare and Seasonal Management

Welfare guide to bovine fasciolosis -- a major parasitic disease with significant welfare and production impact.

Key Facts

Liver fluke (Fasciola hepatica) is one of the most important parasitic diseases of cattle in the UK
Infection occurs through ingestion of metacercariae from wet pasture -- risk peaks in autumn and winter
Acute fasciolosis kills young cattle through massive liver destruction -- a rapid and severe welfare emergency
Chronic fasciolosis causes progressive weight loss, anaemia, submandibular oedema (bottle jaw) and reduced milk yield
The parasite is increasingly resistant to triclabendazole -- the primary treatment
Strategic use of alternative flukicides and rotational grazing reduces resistance selection
Liver damage from chronic fluke is irreversible -- prevention is more welfare-effective than treatment
Flock and herd-level monitoring using bulk milk ELISA or faecal egg counting guides treatment decisions

Welfare Significance

Liver fluke causes significant suffering across the spectrum from acute to chronic disease. Acute fasciolosis kills rapidly and painfully; chronic disease causes months of progressive debilitation. The growing problem of triclabendazole resistance makes prevention and alternative treatment strategies increasingly important welfare priorities.

What You Can Do

Implement a strategic fluke control programme with your vet based on local risk and resistance data
Monitor cattle on fluke-risk pastures using faecal egg counting or milk ELISA
Rotate flukicide classes to reduce resistance selection pressure
Fence off wet areas where mud snails -- the intermediate host -- breed to reduce pasture contamination