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How to feed horses for weight gain is a commonly asked question. Some horses do not maintain their bodyweight easily and it can prove a real challenge to keep them at an ideal weight. Ultimately your horse's ribs should not be visible but they should be easily felt if you run your hand along your horse's side. A common complaint from horse owners is that their horse hasn't got enough topline. This is achieved through the horse working in a manner that strengthens muscles in the back and the correct diet of quality protein which helps to build muscle. Regularly monitoring your horse's weight with a weigh tape or livestock scale will allow you to identify any changes to their weight early, thereby enabling you to make corrective actions quickly. But firstly we must understand why the horse is underweight.
Fibre: Of the three major energy sources (fibre, carbohydrates and fat) for the horse, fibre is the most important. Fibre is the major component of pasture and hay. Some horses can maintain their weight on fibre sources alone. For the poor doer, however, fibre alone will not maintain weight, but there are fibre sources with higher energy content and digestibility than others. When comparing the energy content of lucerne and grass hays, lucerne hay can provide a horse with more energy than grass hay of similar quality. However, low-quality Lucerne hay which has more stem than leaf is not a rich source of energy. When quality pasture or hay is not available, or if the horse does not readily eat hay or have access to pasture, there are alternative fibre sources that can be added to the diet, such as HYGAIN® FIBRESSENTIAL®, the nutritionally enhanced chaff nuggets. The most common are “super fibres” such as beet pulp and legume hulls (soy or lupin hulls). HYGAIN MICRBEET®is a beet pulp based alternative fibre source, the fibre in beet pulp is about 80% digestible (as compared to 50% for the average hay). Soy and lupin hulls are the skin of the bean (not the husk or pod) that is knocked off before oil is extracted from the bean. The energy content of legume hulls is close to that of oats. Certain additive such as yeast may help with fibre digestion if the horse has a problem with the balance of microbes in the large intestine. Yeast has been researched and found to improve fibre digestibility. Many feeds of the HYGAIN feed range contain probiotics, live yeast based additive assisting in fibre, calcium and phosphorous absorption. Maximizing forage quality should be the first dietary adjustment when trying to achieve weight gain.
Carbohydrates: Carbohydrates, specifically sugar and starch in the form of grains have been the most traditional method of increasing the energy density of the diet. Obtaining energy from sugar and starch is very efficient due to its simple enzymatic process. While grain is a concentrated source of energy for the horse, there are some complications with feeding large quantities. The small intestine can easily become overloaded with sugar and starch resulting in an overflow into the large intestine. This can lead to gas colic, colonic ulcers and even laminitis. When trying to get a thin horse to gain weight, it is often tempting to keep increasing the amount of grain being fed. Unfortunately, if too much grain is fed and the delicate microbial population in the large intestine gets disturbed most horses will lose their appetite and the situation worsens. Care should be taken not to feed any more than 2 kg of grain in a single meal. When large amounts of grain are fed it should be divided equally over 3 or more meals throughout the day. Make sure the horse is always getting at least 1.5 to 2% of their body weight in the form of fibre and a good rule of thumb is to try and stick to a roughage to grain ratio of around 70:30.
Fats: Fats and oils are commonly used in horse feeds to increase the calorie content of the feed or to replace the calories supplied by grains. Fat supplementation has many benefits including, providing calories for weight gain and providing essential fatty acids to improve skin and coat condition. Feeding fat has also been reported to decrease excitability in nervous horses. Both animal fats and vegetable oils have been fed to horses, although the use of vegetable oils such as soy, rice bran or canola oil is more prevalent due to superior palatability. Fat sources such as HYGAIN® RBO® (rice bran oil) or soybean contain 2.5 to 3 times more energy than grains on an equal weight basis. Increasing the fat level of the diet is the easiest and safest way to increase the energy density of the diet. Higher energy levels can be obtained by feeding a lesser amount of a high-fat concentrate mix compared to a concentrate mix containing lower-energy grains. Research has indicated that adding 5 to 10% fat to the total diet has maintained the body weight of horses with a 21 to 25% decrease in concentrate intake. HYGAIN® SHOWTORQUE® is a high fat, no cereal grain textured concentrate ideal for safe weight gain. Adding fat to a horse's diet permits safe weight gain while reducing the chance of colic or founder. Digestion of fat also yields less internal body heat when compared to other diets. Thin horses will gain weight and do so without having to eat as much grain if the diet is fortified with additional fat.
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