Michael D. Erskine, D.V.M.

Diplomate, American Board of Veterinary Practitioners

Board Certified in Equine Practice

1941 Long Corner Road, Mount Airy, MD 21771

Office: (301) 829-4977

Email: office@erskinedvm.com / Fax: (301) 576-4465

After Hours Emergency Line: (866) 435-7119

Rotational Deworming

Rotational deworming schedules involve deworming all horses at regular intervals with various deworming products. Efficacy of the program is assessed by periodic fecal flotation exams. These programs have been very successful in controlling equine parasites thus far, but they may promote the development of parasite drug resistance.

Clinical Parasite Control

Parasite infestation in the horse is a common problem that can be effectively controlled. While there are many types of equine parasites, the most common ones are large and small strongyles, tapeworms and pinworms. These parasites can cause numerous health problems including colic, weight loss, diarrhea and general unthriftiness.

In the past, large strongyles were responsible for most of the health problems associated with equine parasitism. Traditional deworming programs, including rotational and daily deworming programs, have been highly effective in controlling large strongyles to the point that these parasites are no longer the most important cause of parasite related disease.

Currently, small strongyles represent the greatest threat to equine health from parasites. Small strongyle larvae become encysted within the walls of the intestine and can cause inflammation and intestinal disturbances. Clinical signs associated with small strongyle infection can range from mild subclinical (unnoticeable) alterations of intestinal function to life threatening intestinal disease.

A major concern with small strongyles is the increasing development of drug resistance to commonly used dewormers like benzimidazoles and pyrantel. Recently there have even been reports of resistance to ivermectin. Our new Clinical Parasite Control Program addresses the problem of emerging drug resistance in small strongyles.

The Clinical Parasite Control Program addresses the emerging problem of parasite drug resistance. This program uses quantitative fecal egg counts to determine which horses need to be dewormed more frequently and which horses can be dewormed less frequently. The subsequent reduction in the use of dewormers decreases the selective pressures for the development of parasite drug resistance.



Sample dewormers

Small Strongyle