Our yard has finally decided that we can have control over our worming programmes. So instead of having to follow the blanket approach to worming (i.e. all horses are wormed at set intervals), we can now egg count and do it ourselves. I have spoken to my vet and joined in with their yearly plan where they provide 3 egg counts per year. They suggest we do the following: Worm all horses in Autumn after the first frost. I can't remember the name of the wormer but it is designed to kill anything in the system. Worm all horses in spring as soon as the frosts stop. I think this is for tape worm which doesn't show up on the egg counts. After the first wormer in spring, egg count every 12 weeks and then worm accordingly. Is this what you all do, and if not, what do you do differently?