Good Practice based on Current Knowledge

• Breed cattle with a known resistance to helminthiasis, by measuring faecal egg counts in replacement calves.
• Lower stocking density.
• Use the dilution strategy (rotational grazing of paddocks by calves, followed by older cattle) or move calves to clean pasture at monthly intervals.
• Alternative wormers may be useful with the above-mentioned strategy.
• In the case of parasitic gastroenteritis, the animals have to be drenched with an anthelmintic on the advice of the named veterinary surgeon.

• Type I ostertagiasis can be treated with almost any of the anthelmintics currently available.
• Type II ostertagiasis requires the use of the modern longer acting benzimidazoles or pro-benzimidazoles or a moxidectin (Cydectin) injection, all of which are effective in removing both adult and inhibited fourth stage parasites.