Allergies

Description

Allergies are the result of an exaggerated physical reaction by the immune system to normal substances in the atmosphere. When confronted by allergens, the horse's body produces antibodies that cause biochemical changes in the body, thereby producing symptoms and signs of the allergy.

Symptoms

• Persistent coughing which may be accompanied by wheezing
• Watery nasal discharge
• Signs of skin irritation
• Evidence of physical discomfort
• Respiratory problems
• Diarrhea

Cause

Allergies are related to many normal substances in the environment including sensitivity to inhalants produced by pollens, grasses, weeds, shrubs, molds, oats, wheat, barley, corn, and barn dust, as well as ingredients in commercial horse foods. Certain foods, feeds, grains, hay varieties, and nutritional supplements may trigger allergies. Other causes include reaction to chemicals in tack supplies, insect saliva, and products used in the stable area. Skin allergies are often caused by insect bites resulting in hives or welts as a result of the build-up of proteins called antibodies.

Prevention

Horse allergies can take years to develop. Undetected allergies are difficult to prevent and diagnose initially. If a horse has a healthy immune system, fighting off allergens will be easy, but, if the immune system is compromised in any way, allergies can become a serious problem. Keeping the environment clean and insect free, and changing the bedding often is key to prevention. In some cases, using shredded paper or rubber mats for bedding will help prevent or resolve allergy problems. Elimination of foods that cause allergy symptoms, and following a recommended diet for horses with allergy problems is helpful when food allergies are involved

Treatment

The best form of treatment is avoidance of the offending allergens. In reality, this is not possible. Some allergies naturally dissipate with time, but steroids and other drugs are often necessary to counteract the unpleasant symptoms and effects of allergies. If the use of drugs is necessary, the horse's condition should be thoroughly evaluated by a veterinarian before the treatment is started.

Prolonged use of drugs can have serious side effects, so proper testing to determine the source of the allergic reaction is important. Having ruled out other possible maladies, blood may be drawn and sent to a laboratory for diagnostic evaluation. The horse's serum will be tested for sensitivity to a number of possible allergens including grasses, weeds, molds, pollens, barn dust and a number of food types and ingredients used in horse food preparations.

Based on the results of the allergy test, the same allergens to which the horse tested sensitive are injected in increasing concentrations. This builds the horse's tolerance to the allergens so it can live more comfortably in its environment

Dig Deeper

Links to EquiMed selected academic articles that go into detail about the disease/condition.