While no single system will fit every situation, there are certain guidelines that all horse owners can follow. Management and chemical control are the two methods of internal parasite reduction that reduce colic risk and improve general animal health. One management practice is to never feed horses on the ground.
Management involves interrupting the parasite's life cycle.
Manure is the primary means through which parasites are spread. Harrowing or dragging pastures during hot, dry conditions will reduce exposure to parasites. Manure should be applied to cropland or composted before being spread on currently grazed pastures. Chemical control deworming programs work best if treatments coincide with the parasite life cycle. Most vets suggest that horses be dewormed at least 4 times per year.