Figure 3. Increasingly, nematodirosis is seen in older lambs during late summer and autumn. This may involve an evolutionary change in the parasite's dependence on specific conditions for egg hatching, or may be an effect of climate or pasture management change on larval survival.

Changing patterns of Nematodirus battus infection

During the summer and autumn 2021, the FECs of lambs in a hill flock of about 500 ewes in the south-east of Scotland were monitored using a saturated saline and cuvette method with a detection...