The reappearance of strongyle eggs in faeces of horses treated with pyrantel embonate

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Abstract
The reappearance of strongyle eggs in the faeces of horses treated with pyrantel cmbonate was studied. The horses (103) were devided in 11 groups on 8 different farms. The efficacy of pyrantel embonate against strongyles, based on egg count reduction tests, was 99.8%. Mean weekly egg counts performed between week 2 and week 9 after treatment showed that 5 weeks after treatment the egg output passed the 90% reduction level. It is concluded that strategic treatments of horses with pyrantel embonate for the prevention of strongylosis should be administered with intervals of 6 weeks.