The use of ‘worm-free’ sheep in grazing experiments

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Abstract
1. It has proved possible to operate a ‘worm-free’ area in which sheep grazing experiments can be carried out, without significant interference from disease.2. The organization of such a unit is described and the results are presented in terms of the problems and difficulties which have been encountered during 4 years of continuous and increasing use. There is no apparent reason why these problems should increase with time.