Abstract
Extract Anthelmintic resistance in gastrointestinal nematode parasites of domestic livestock is usually detected in the field by means of a faecal egg count reduction test (FECRT). Basically, this test provides an indirect estimate of the efficacy of an anthelmintic by measuring the reduction in the faecal egg counts (FECs) of a group of animals following medication. Where this anthelmintic treatment results in a faecal egg count reduction (FECR) of less than 95%, anthelmintic resistance is generally considered to be present (McKenna 1990, 1994). Despite the inherent simplicity of the test there are a number of possible variants to the procedure that could affect its outcome and amongst the most fundamental of these is the formula used to calculate the FECR.
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