BLACK SCOUR WORM Trichostrongylus spp.
THIN-NECKED WORM Nematodirus spp.
TAPEWORM Moniezia spp.
PERFECT CONDITIONS: Larvae survive well in cooler conditions and so disease is often seen in autumn. SIGNS: Reduces growth in lambs and milk production in ewes. RESISTANCE: Moderate levels of resistance seen to Lev and BZ. Increasing levels of resistance to abamectin, moxidectin, and combination drenches. Triple combination and novel drench resistance becoming more common.
TIPS: By itself it rarely causes reduction in growth and productivity. Gastrointestinal parasites causing diarrhoea can predispose lambs to flystrike. TREATMENT: Albendazole (BZ) is known to have moderate efficacy against tapeworm but praziquantel is the drug that specifically targets tapeworms. SIGNS: Tapeworm is the only gut worm that you can actually see in the faeces of animals.
DISTRIBUTION: Two different species ( N. filicollis and N. spathiger ) are usually present on most farms. PERFECT CONDITIONS: N. filicollis requires a period of chilling in order to be able to hatch, meaning that eggs produced one season don’t hatch until the following spring. RESISTANCE: There are high levels of resistance to the BZs, particularly in N. spathiger . There are moderate levels of resistance to levamisole and BZ/Lev combinations. MLs, ML/Lev and triple combinations remain highly effective.
Boehringer Ingelheim Animal Health New Zealand Ltd Product Guide 2022 11
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