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Weight loss is simply a result of more calories being used by the body than are being consumed. There are several potential causes of chronic weight loss in horses such as poor quality or limited feed supply, health problems and disease as well as social interaction and competition between horses. Chronic weight loss can also be the result of starvation caused by intentional neglect, ignorance, economic hardship of owner, disease, poor dentition, pecking order, parasites or seasonal variation in availability of pasture. Remarkably, horses can survive chronic weight loss. It has been reported that horses can lose 30% or more of their body weight and still survive. Horses in this condition will have very little muscle mass and will be very weak. They will need special attention and a sound nutrition program to return to a healthy body condition. Horses that have lost 50% or more of their body weight won’t survive, even when provided with the best care.
Poor Quality or Limited Feed –Probably the most common cause of weight loss is poor quality or limited feed. Forage (hay/pasture) plays a significant role in chronic weight loss since it is the primary component of the diet. In addition, it is difficult to accurately determine the quality of hay and pasture. In other words, a person may be providing enough forage for their horse but the forage is of such poor quality the horse is not able to properly digest it. If horses have free-choice access to as much forage as they will consume and they are losing weight, better quality forage must be provided. In addition, a grain concentrate can be added to provide extra nutrients that are missing in poor quality forage. The other common mistake made with feeding horses is simply to not provide enough feed. For example, an adult horse will require at least 2% of their body weight per day (10 kg for a 500 kg horse) in dry hay. If horses are being fed less than this amount, horses will often experience chronic weight loss.
Health & Disease Issues –Health and disease issues cover an array of topics ranging from dental problems to parasite infestation to diseases such as lameness, COPD, Cushings, Gastric Ulcers, Equine Infectious Anemia, chronic diarrhea, cancer, Lawsonia, liver or kidney disease, chronic infections, and neurologic conditions. Dental problems are a significant cause of weight loss in horses. If horses cannot properly chew their feed, they will not be able to utilize the nutrients in feed. Signs that a horse may have dental problems include: dropping feed while chewing, nasal discharge, foul-smelling breath and facial swellings. It is important to do a complete oral exam and not just look at the teeth, as other disease processes may be present in the horse's mouth. Internal parasites, such as worms, compete with the horses’ body for nutrients and often result in weight loss. Parasites may become resistant to many of the common de-wormers, so it is important for your vet to check the faeces for parasite eggs to rule out this problem. Even then, larval parasites can be involved that cannot be found in a routine fecal analysis, and treatment for larval parasites may be required to halt chronic weight loss. A number of other diseases and chronic health problems can result in weight loss. Any disease that affects a horse will increase both protein and energy requirements, often resulting in weight loss. In order for horses to recover from the disease and gain weight, the disease or health issue must first be treated and resolved.
Social Interaction- As most horse owners have witnessed, horses can be very aggressive toward each other. If you are group feeding horses you have the added complication of the natural hierarchy of dominance. Not only can younger, smaller, more timid horses be pushed away from the feeders, but they may be experiencing high levels of stress which not only includes expending more energy, but can predispose to health problems like stomach ulcers and colic. In general, it is important that underweight horses are fed separately. This will ensure they are actually getting the amount of feed which is intended for them.
Once you have identified the cause of the chronic weight loss in the horse it is time to begin implementing feeding strategies to enhance weight gain. The 2007 National Requirements for Horses suggested that it takes 16 to 20kg of gain to change a horses body condition score by 1 unit (based on a 500kg horse). We can safely achieve this amount of weight gain in approximately 90 days by adding additional calories to the diet. Care should also be taken when feeding for weight gain not to cause digestive disturbances with the increased feed intake. The question then becomes “what should I feed my horse for weight gain?”
Firstly we need to increase the amount and quality of forage available to the horse. Adding lucerne hay, chaff or HYGAIN MICRBEET® will increase the calories content of the diet. Next we can start to gradually introduce commercial feeds to the diet – this must be done with care so as not to cause any digestive disturbance. Then we should top dress the grain with a fat supplement like HYGAIN® RBO® or HYGAIN TRU GAIN®, or gradually switch the horse over to a high fat feed concentrate such as HYGAIN® SHOWTORQUE® or HYGAIN® GROTORQUE®.
Fats and oils are commonly used in horse feeds to increase the calorie content of the feed or to replace the calories supplied by carbohydrates. Fat supplementation has many benefits including, providing calories for weight gain and providing essential fatty acids to improve skin and coat condition. On an equal weight basis rice bran oil provides horses with 2.5 times the digestible energy of corn and nearly 3 times the digestible energy of feeding oats. Thus, adding fat to the diet increases the energy density (number of calories per kg of feed) of the diet. Thin horses will gain weight and do so without having to eat as much grain if the diet is fortified with additional fat. Weight loss in horses can be caused by many different factors; once you have resolved those issues and started your horse on a calorie dense diet, it will begin to gain weight. Remember healthy weight gain is a slow process – do not expect results over night.
Library | 08.08.23
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