This involves checking worm egg counts after a group of sheep have been drenched with a particular drench. Usually, a number of drenches are tested at the same time. Advice should be obtained from your veterinarian or adviser to help set up a test, and maximise the benefits from the results. One of the best long-term solutions to worm control and drench resistance is to introduce sheep bred for worm resistance. As anthelmintic resistance worsens, worm resistant sheep, combined with other management tools, will be an important part of a total worm control package.
Advisers can supply information about ram breeders who can already supply resistant sheep.
Further reading Barber's pole control - Farmnote No. Recommendations were current at the time of preparation of this publication. Its availability does not imply suitability to other areas, and any interpretation or use is the responsibility of the user. Mention of product or trade names does not imply recommendation, and any omissions are unintentional. Recommendations were current at the time of preparation of the original publication.