Feeding Strategies for Metabolic Horses
Metabolic conditions in horses, such as Equine Metabolic Syndrome (EMS) and Pituitary Pars Intermedia Dysfunction (PPID), can be incredibly challenging for owners. These equine disorders lead to insulin dysregulation, causing the horse to have either excessive or an abnormal response to insulin. This typically occurs due to high sugar and starch feeds. Here, we will explore practical feeding strategies to manage these conditions, ensuring that even the pickiest of eaters maintain a healthy weight.Understanding Low-NSC Diets
Nonstructural carbohydrates (NSC) are primarily sugars and starches, notorious for triggering metabolic issues in horses. For horses with EMS or PPID, managing these nonstructural carbohydrates is crucial. The goal is to limit feeds with NSC to below 12-14%, verified through lab testing. Traditional grains and lush grasses might seem nutritious but can exacerbate metabolic conditions. Instead, a high-fiber, high-fat diet provides energy without causing insulin spikes, acting as ‘cool’ calories.Weight Gain Strategies under Low-NSC Diets
1. Managing PPID Effectively
Management of PPID is crucial, especially since it heightens muscle wasting and immune suppression, making weight maintenance challenging for older horses. Proper treatment with medications like pergolide (Prascend®) or cyocteate not only curbs symptoms but improves the horse's appetite and insulin sensitivity. This, in turn, allows dietary changes to have a more pronounced effect. Regular bloodwork, at least biannually, aids in monitoring and adjusting treatment.2. Increase Fermentable Fiber
Fiber acts as the knight in shining armor for horses with metabolic conditions. Providing ad libitum access to low-NSC grass hay—ideally tested to be under 10-12%—is essential. For instance, if dealing with a 1,000-pound horse, start with a diet that provides 15-20 pounds of hay daily. It's not just about the quantity, but the type—alfalfa hay, often misunderstood for its richness, actually boasts NSC levels of 5-10%, which can be beneficial. Additionally, soaking hay reduces sugar levels further, enhancing palatability for picky eaters. Offering this in small, frequent meals, much like a warm slurry, can be a game-changer.3. Incorporate Fat Supplements
Fat is a concentrated energy source, packing 2.25 times more calories than carbohydrates or protein, without the risk of raising NSC. Introducing small amounts of vegetable oils—corn oil or flaxseed oil—can significantly benefit metabolic horses. Commencing with 0.5-1 cup/day, these should be gradually increased to prevent digestive upset. Commercial feeds rich in fat, like beet pulp and high-fat pellets, are also great choices.| Strategy | Key Feeds | Caloric Benefit | Tips for Picky Eaters |
|---|---|---|---|
| PPID Meds | N/A | Improves appetite | Vet-monitored; recheck ACTH seasonally |
| Fiber Boost | Low-NSC grass hay, alfalfa pellets/chops | Slow-release energy | Warm slurry; ad lib access; soak to reduce sugars |
| Fat Addition | Corn/flax oil, rice bran | High-density calories (9 kcal/g) | Flavor with apple juice; small doses initially |
