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PPID: An Endocrine Disease

Pituitary pars intermedia dysfunction (PPID, or equine Cushing’s disease) is caused by an enlargement of the pituitary gland’s middle lobe (the pars intermedia), which results in an overproduction of hormones that regulate bodily functions. Learn more about this disease in our slideshow.

Posted by Michelle Anderson | Jun 7, 2021 | Basic Care, Body Condition, Conditioning, Cushing's Disease, Diseases and Conditions, Hoof Care, Horse Care, Laminitis (Founder), Media, Metabolic Problems, Monitoring Exercise Performance, Nutrition, Nutrition-Related Problems, Older Horse Care Concerns, Slideshow, Smaller Breeds, Sports Medicine, Working With a Veterinarian

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Hypertrichosis (Abnormally Long Coat)

A long, abnormally shedding coat is the hallmark clinical sign of PPID. Body clipping the coat during summer months can help keep a PPID horse from overheating. | Photo: iStock

Early Signs of PPID

While hypertrichosis is a common sign of advanced PPID, horses might show other, more subtle signs earlier. These can include lethargy and decreased performance. Many people think of PPID as an older-horse disease, but studies have identified horses with PPID as young as 7 years old. | Photo: iStock

Affected Breeds

According to the American Association of Equine Practitioners, Morgan horses and ponies are overrepresented in the PPID population. However, horses of any breed can get PPID. | Photo: iStock

Excessive Drinking and Urinating

Horses with PPID also drink and urinate more than normal, healthy horses. These clinical signs are called polydipsia (excessive drinking) and polyuria (excessive urinating). | Photo: iStock

PPID Testing

In addition to noting classic PPID clinical signs, veterinarians can use blood tests to confirm diagnosis. Learn more about diagnosing PPID in “At A Glance: Diagnosing Equine Cushing’s Disease."| Photo: Alexandra Beckstett/The Horse

PPID and Insulin Resistance

Horses with PPID can also become insulin resistant, which leads to many of the clinical signs associate with PPID, including abnormal fat deposits, lethargy, and laminitis | Photo: University of Kentucky's College of Agriculture

Laminitis Risk

Due to hormonal imbalances, horses with PPID have an increased risk of laminitis, a painful hoof disease that can be fatal. | Photo: Erica Larson/The Horse

Nutritional Management

In addition to medication, nutrition plays an important part in managing horses with PPID. Veterinarians recommend decreasing nonstructural carbohydrate (essentially the sugars and starches in the diet) to reduce laminitis risk. | Photo: iStock

Exercise

Keeping a horse with PPID fit can slow muscle wasting while also prolonging his competitive career and long-term comfort. | Photo: Anne M. Eberhardt/The Horse

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