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close this bookIntegrated Helminth Control - KARI technical note no. 2 (DFID - KARI, 1999, 54 p.)
close this folderPART THREE - Guidelines For Anthelmintic Use
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View the documentSheep And Goat Wormer Guide
View the documentCattle Wormer Guide



· To minimise the risk of anthelmintic resistance, the frequency of drug use should be reduced as much as possible. As a rough guide, no more than four doses of anthelmintic should be given to any stock in one year.

· Use drugs from different chemical groups in successive years

· The drug market in Kenya contains a number of fake and substandard products. Use only products made by a reputable manufacturer. Report any suspected drug efficacy problems to the local Veterinary Investigation Laboratory.

· Dose animals on the basis of the heaviest animal in the group. Farmers have a tendency to underestimate animal weights and hence often under dose the animals.

· Most anthelmintics given orally are more effective if given on an empty stomach. Animals are best dosed early in the morning before they are released for grazing. Animals that are not normally kept in a boma over night should have their feed restricted prior to treatment.

· Oral dosing should aim to place the drug into the animal's throat rather than into the mouth. This ensures proper uptake into the rumen.

· Dosing equipment should be accurate and properly maintained.

· Anthelmintics should not be combined with other drugs or diluted.

· Bottles of anthelmintic should be properly mixed prior to use. Repeated slow inversion of the bottle is better than vigorous shaking.

· Care should be taken in introducing animals to the flock/herd. They may be bringing resistant worms with them. Only buy animals from farms who practice a minimal dosing regime. Try to get a history of anthelmintic use. On arrival treat the animals with ivermectin (if possible) or with one dose of levamisole and one dose of benzimidazole. If possible keep the new animals separate from the herd/flock for 48 hours after treatment and discard and burn any manure produced during that time.