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LIVER FLUKE Fasciola hepatica
BARBER’S POLE WORM Haemonchus contortus
BROWN STOMACH WORM Teladorsagia/Ostertagia circumcincta
TIPS: This parasite can live in sheep, cattle and deer. TREATMENT: Sheep are particularly sensitive to immature fluke migrating through their livers, so they need to be treated with a product that kills immature flukes.
THE BLOOD SUCKING PARASITE. PERFECT CONDITIONS: Usually seen seasonally as it needs warm ambient temperatures for its larvae on the pasture to survive. One adult parasite can produce up to a whopping 15,000 eggs per day. TIPS: During the risk period for BPW, a product that has persistent activity is advised, as the ‘teenaged’ worms suck blood before they become adults at 3 weeks post-ingestion. BPW has the ability to inhibit its own development inside the sheep and re-emerge during more favourable conditions i.e. the following spring. RESISTANCE: Low levels of resistance to the BZs only.
PERFECT CONDITIONS: Larvae survive freezing on pasture, and can ‘hibernate’ in stomach wall. A major worm of ewes around lambing, and of lambs during the spring and early summer. SIGNS: Reduces appetite, hampering growth in lambs and milk production in ewes. RESISTANCE: Moderate to high levels of resistance seen to all single active drenches. Moderate levels of resistance to combination drenches but this has been increasing over the past few years.
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