All horses pick up worms through grazing, licking, or eating food off the ground.  An effective deworming program is an essential part of your horse's wellness program.  The following is a deworming program for adult horses in the Central Okanagan.  A more in depth discussion follows, including a discussion of the latest recommendations for a targeted deworming program.

JANUARY no deworming
FEBRUARY Quest.Gel.(end.of.February)
MARCH no deworming
APRIL no deworming
MAY Ivermectin(Eqvalan.or.equivalent)
JUNE no deworming
JULY Ivermectin
AUGUST no deworming
OCTOBER no deworming
NOVEMBER Eqvalan.Gold.or.Quest.Plus
DECEMBER no deworming

In foals and weanlings, ascarids (roundworms) are a major parasite problem.  They should become immune to this parasite by about one year of age.  More frequent worming is necessary


Internal parasites are silent killers.  They can cause extensive internal damage, and you may not even realize your horses are heavily infected.  At the very least, parasites can lower resistance, rob the horse of valuable nutrients, and cause gastrointestinal irritation and unthriftiness.  At their worst, they can lead to colic, intestinal ruptures, and death.

Using deworming agents on a regular schedule in combination with good management procedures is critical to relieveing your horse of most parasites.  Since parasites are primarily transferred through manure, good management is key.  In terms of management priorities, establishing a parasite control program is probably second only to supplying the horse with clean, plentiful water and high quality feed.

To get rid of parasites before they attack your horse, follow these suggestions from the American Association of Equine Practitioners (AAEP):

  1. Pick up and dispose of manure droppings in the pasture at least twice weekly.
  2. Mow and harrow pastures regularly to break up manure piles and expose parasites eggs and larvae to the elements.
  3. Rotate pastures by allowing other livestock, such as sheep or cattle, to graze them, thereby interrupting the life cycle of the parasites.
  4. Group horses by age to reduce exposure to certain parasites and maximize the deworming program geared to that group.
  5. Keep the number of horses per acre to a minimum to prevent overgrazing and reduce the fecal contamination per acre.
  6. Use a feeder for hay and grain rather than feeding on the ground.
  7. Remove bot eggs quickly and regularly from the horse's haircoat to prevent ingestion.
  8. Rotate deworming agents, not just brand names, to prevent chemical resistance.
  9. Consult your veterinarian to set up an effective and regular deworming schedule.

With the many safe, convenient products available today, establishing an effective deworming program is easy.  Discuss a plan with your veterinarian and implement it without delay.  A good parasite control program will go a long way toward maximizing your horse's appearance, performance, and comfort.  The net result will be an animal that is as healthy on the inside as it appears on the outside.

Okanagan Equine Veterinary Horse Services is located in Kelowna, British Columbia, Central Okanagan. We offer an equine hospital, equine reproduction, breeding and stallion collection plus semen evaluation facility.