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Dealing with anthelminthic resistance is an issue on Irish sheep farms. Determining the efficacy of the products used is a necessary first step in adapting to this challenge and on this episode of OviCast, Ciaran Lynch is joined by Damian Costello, Sheep Specialist, to discuss why it’s so important to check products on farm. The use of a drench test is one means to check how an anthelminthic product is working on a farm and Damian takes us through the various steps involved in conducting a drench test. Finally, Damian explains how to interpret the result and determine the level of resistance to the chosen product. For more information go to: https://www.teagasc.ie/publications/2020/control-of-stomach-worms--improving-sustainability.php For more episodes from OviCast, visit the show page at: https://www.teagasc.ie/animals/sheep/ovicast-sheep-podcast/