I have had goats for 9 years and have never wormed mine yet. I use DE in their feed, and all have good weight on them, and I just don't believe in worming them and possibly contaminating their milk or meat. I can understand if you start out with goats from someplace and worm them once. But once all the worms are dead, why do you have to keep worming them? Where do these "new" worms come from and how are they spread? I can see where the wild goats do not need wormed as they move from place to place. But if you have a large enough area for the goats to run in, it just doesn't make sense to have to worm them again & again.