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Just a note

Given the uncertainty of the first results, we cannot recommend a full-scale trial of either treatment - especially since we cannot be sure that, even if the treatment effect was 'real', the observed treatment effect was because the pour-on was killing the flies or because the ear tags were repelling them. Nor, for that matter, can we be sure that either treatment was better than none at all. Notice also, that by using three equal treatment groups, each group has an equal influence (weight) upon our conclusions.