Pannacur or safe guard horse wormer and guess at the weight dosage. One tube treats like 1000 lbs so just figure it out by that. I don't like the panacure that you sprinkle on food. How do you know if everyone gets enough or some one doesn't hog all the food and get to much.
If they have it bad you can repeat in 14 days but I usually don't unless I'm seeing it bad.