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Modified McMaster (egg count per gram of faeces)
Counting of worm eggs is done using a counting chamber after enrichment by flotation.
This method is primarily used in horses, sheep and other farm animals to carry out
targetedor
selective deworming, in which individual deworming is only carried out if there are > 200 eggs per gram of faeces. If all animals of a population that have a worm infestation are dewormed, only resistant worms survive. However, if only animals that have a more severe worm infestation are dewormed, an untreated worm population is also found in the animal population, which reduces the selective advantage of resistant worms and thus counteracts the further increase in resistance.
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