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If you are purchasing animals in the mart and you suspect them to have a heavy worm burden, avoid using an ivermectin-based product straight away. Ivermectin-based products can lead to a very fast kill and the stress of coughing up dead worms can lead to pneumonia issues.
White drenches and levamisole-type drenches have a much slower kill rate and will be easier on the animal. However, these products do not have the same residual cover as ivermectin-based products.
A simple dosing programme would be to dose on arrival with a white drench/levamisole drench and then dose with an ivermectin based product two weeks later. This should then provide cover for four to six weeks. Taking faecal samples is a cheap way of determining whether you need to dose or not. Talk to your vet about getting them analysed.
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