Originally Posted by AfleetAgain
Yes, my horses are on a rotational deworming schedule, and have been since I have had them. This horse has been started on one, it was the previous owner that used the same type and only twice a year..the other horses in the pasture with him now are not ours, so we cannot deworm them. He is not being ridden, just handwalked
If he didn't look like that when he was purchased & was only getting dewormed twice a year it's because the previous owner had parasites under control, unlike at the new place. I only deworm twice a year & fecal tests are always negative. New horses do not go on pasture until they have clear fecals also.
Your friend's barn needs to improve it's worm management but as they probably won't she needs to do the rotation as suggested even if the others don't. At least the worms won't get a stronghold in her horse as frequent deworming breaks up the life cycle.
Personally I would move my horse to a better place but I understand that is not always an option.