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Holistic Horsekeeping for Insulin Resistance
13/07/2006

The past few years we have learned so much about how manage our horses' diets so that we keep our horses healthy and happy. Specifically, we have developed a great deal of practical research about insulin resistance, laminitis, the glycemic indexes of different feed, and the carbohydrate content of pasture grasses, as well as how all of these factors interact. With all of this data in hand, this month I explore how we can provide our metabolically-challenged horses with a high quality of life.

As the role of the horse has shifted from that of work animal to companion our breeding programs have changed. Our ideal equine companions are gentle, calm, steady creatures who are happy to be ridden but don't mind just hanging out and receiving affection. This same laid-back horse is often also an easy keeper. He gains weight when he does nothing more than catch a whiff of feed! He is also the one horse out of the herd who is most likely to encounter the metabolic challenge of insulin resistance.

Insulin is the hormone responsible for moving glucose out of the bloodstream and into the cells to be transformed into energy. The insulin-resistant horse possesses a unique genetic makeup that affects this process, making it less efficient than normal. As a result he is able to conserve more glucose than usual, allowing him to survive in some very sparse environments.

So what happens when we turn out the easy-keeping horse into a pasture full of cultivated and rich grass? Disaster! As the horse consumes rich grass his blood glucose levels climb, causing his body to produce more insulin to compensate. Eventually the sustained high intake of carbohydrates in the grass overwhelms his body's ability to control the glucose released into his blood. As result, the glucose levels rise, triggering laminitis and other symptoms of metabolic imbalance such as ravenous appetite, exercise intolerance, fertility problems, excessive thirst, or obesity.

To prevent your horse from becoming such a walking disaster, the first step is to identify whether he is at risk for becoming insulin-resistant. Here are a few traits to watch for:

1. Obesity
2. Heavy cresty neck
3. Fat pons over the withers and at the base of the tail
4. Elevated levels of insulin and triglycerides in the blood

If you discover that your horse has one or more of the traits for insulin resistance you may be tempted to put him in a dry lot and starve him. Unfortunately, while this may keep your horse safe from the serious consequences of insulin resistance, it can also produce a very unhappy horse with a poor quality of life. Instead, try some of the suggestions listed below for giving your insulin-resistant horse a high quality of life.

1. EXERCISE: Regular exercise helps prevent obesity by allowing the insulin to work more efficiently (fat cells actually produce hormones that interfere with the action of insulin). Even if you are not able to ride your horse daily you can exercise him by ponying him off another horse or driving him around the arena or pasture. Long slow walks are as good as or better than short periods of intense exercise.

2. CHECK YOUR PASTURE: Monitor your pasture grass and limit your horse's grazing when grasses are likely to be high in sugar, such as when the nights are cool and the days are sunny, after a rain or frost, or during a severe drought. Remove or severely limit access to clover.

3. MOW: Keep your pastures mowed to encourage the grass to grow steadily, a process that causes the grass to use rather store sugars.

4. FERTILIZE NATURALLY: It's better to use natural rather than synthetic products to fertilize your pasture. Although most articles on pasture management suggest using liberal amounts of
synthetic substances such as NPK fertilizers, I recommend against this approach. These types of fertilizers have a negative effect on the microorganisms in the soil that are necessary for plants to absorb minerals.

5. FEED PROBIOTICS: Probiotics have a similar effect on mineral absorption in horses that microorganisms in the soil have on plants. Your horse needs minerals like chromium and magnesium for proper glucose metabolism, and probiotics assist your horse in absorbing these with maximum efficiency.

6. FEED MINERALS: Offer your horse high quality minerals that are designed specifically for horses and include a wide range of trace minerals. Horses do best with chelated minerals, of which there are two types: plant-based products that are naturally chelated and synthetic products that artificially chelate minerals by combining them with certain proteins. My favorite mineral supplements include blue-green algae, kelp, and free choice minerals from Advanced Biological Concepts.

7. FEED LOW AND SMALL: If you must offer grain to get supplements into your horse, I suggest giving low glycemic index feeds such as Purina Equine Senior, beet pulp, or wheat bran in small amounts only.

8. USE A MUZZLE: If pasture conditions are unacceptable for long periods of time, consider letting your horse graze for limited amounts of time wearing a grazing muzzle to limit intake. It's safest to turn your horse out during the early morning or on cloudy days.

9. ADD FAT: As counterintuitive as it might seem, giving fat to your overweight horse in the form of rice bran, cold-processed vegetable oil, or ground flax seed can be very helpful. These
forms of fat help curb your horse's appetite and slow the release of glucose into the blood.

10. MAKE YOUR HORSE WORK: By placing your horse's feed, water, salt, and shade in different locations your force your horse to cover as least a little ground every day. If your horse has to spend time in a dry lot then scatter his hay as widely as possible to keep him moving while he is eating.

11. GO NATIVE: Utilize native grass pastures if possible for grazing. Native grasses are safer since they have not been genetically selected for either rapid growth or high sugar content. If these pastures are mowed regularly and not overgrazed they may not need any fertilizer or additional weed control.

12. ADD ANTIOXIDANTS: The laminitic horse needs more antioxidants than the average horse to stay healthy and comfortable. Because his cells function less efficiently his body is more prone to create a heavy free radical load. Adding natural antioxidants such as Tahitian noni to your horse's diet can significantly reduce the free radical load.




Material is written and edited by Madalyn Ward, DVM. Copyright (c) 2006
HolisticHorsekeeping.com. All rights reserved.

You may reprint material in other electronic or print publications provided the above copyright
notice and a link to http://www.holistichorsekeeping.com is included in the credits.

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