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The macrocyclic lactones (ML). Resistance of black scour worm to this group has been reported in Australia, but confirmed cases are still uncommon and likely to exist on few properties. However, some properties in Australia have resistant small brown stomach worm. Resistance by barber’s pole worm to this group occurs on many properties in summer rainfall regions and on some properties in other regions. Generally moxidectin is more potent than abamectin, which in turn is more potent than ivermectin. Moxidectin also has persistent activity. Unless resistance is severe, MLs may still be useful when administered with unrelated actives in combination products.
Visual scoring provides an assessment of the susceptibility of the flock for both breech and body strike. An assessment of wrinkle score will provide an indication of breech strike risk. For body strike risk, score sheep for fleece rot. With this information you can:
The Visual Sheep Scores Guide provides a standard method for assessing and describing a range of visual traits in sheep, including wrinkle and fleece rot. Evaluating the flock using these guidelines is easy and low cost.
Alpacas and cattle can carry goat worms. While young cattle/calves carry some goat worms, adult cattle tend to have very low burdens of goat worms and contribute very little to contamination of pastures with worms affecting goats.
Treatment for flystrike exposes any lice present to chemical. Likewise, lice treatments can also select for resistance in sheep blowflies if the chemical is active against flies. If possible, use chemicals from different chemical groups for controlling lice and flystrike in the same year. The names of flystrike control products containing cyromazine and dicyclanil, which don’t affect lice, are listed in the LiceBoss Products Tool.