Recent years have seen growing resistance to multiple classes of wormers across sheep and cattle. Here we look at what causes wormer and antibiotic resistance in sheep and how resistance develops.  Click on the arrow underneath the picture to go through the six steps and you can go back or replay at any time. See also: Strategies for combating wormer resistance in sheep and cattle 1. Worm life cycle Sheep eats grass contaminated with worm larvae Larvae develop into worms […]