great question! All I can give is my own experience... I did dry lot when I first started for five years. My goats came from experienced breeders and I do believe they were more resistant to worms. When we bought another place that had pasture I didn't see any problems with worms but a HUGE problem with hoof rot. The land was previously used for cows and horses. I still don't know a lot about the rot but my vet bills and lame goats almost killed the idea of having goats. I've since moved and I'm looking forward to hearing about other peoples experiences.