Sheep Liver Fluke: Welfare and Control

Liver fluke infestation is a major cause of production loss and sheep suffering, requiring integrated management combining treatment, pasture strategy, and drainage.

Key Facts

Fasciola hepatica, the common liver fluke, causes acute and chronic disease in sheep and cattle.
The parasite's life cycle depends on the mud snail Galba truncatula, thriving in wet, poached pastures.
Acute fasciolosis can kill sheep rapidly; chronic disease causes progressive weight loss and anaemia.
Fluke resistance to triclabendazole is an increasing problem in many parts of the UK and Europe.
Strategic flukicide treatment timing is critical and depends on regional climate and pasture risk.

Welfare Considerations

Sheep with liver fluke suffer from pain, weakness, anaemia, and in acute cases internal haemorrhage causing rapid death. Chronic subclinical infection causes prolonged suffering through reduced appetite, poor body condition, and immunosuppression. Integrated fluke management combining strategic treatment, snail habitat reduction through drainage and fencing, and pasture rotation significantly reduces disease burden. Farmers should consult their vet for regional treatment timing recommendations.

What You Can Do

Work with your vet to develop a strategic fluke treatment programme based on local risk.
Monitor pasture conditions and identify wet, poached areas that support snail populations.
Fence off wet areas where possible to reduce sheep exposure to fluke-risk pasture.
Test flukicide efficacy with coproantigen or faecal egg counting to detect resistance early.
Consider drainage investment in chronically wet pastures to reduce snail habitat long-term.