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Feeding the sick or injured horse

Feeding the sick or injured horseThe competition season is in full swing; your horse is fit and performing well.  Then it happens, the horse takes a bad step and pulls up lame.  Your immediate concern is the well-being of the horse.  What is the nature of the injury?  How severe is the injury?  How much competition time will the horse miss?  All logical questions, but another question to consider is how to feed this horse to speed up the recovery?

Lack of appetite

Injuries come in many forms.  Bone fractures, skeletal lameness, muscle injuries, tendon injures, ligament injuries and a host of others.  The net result of these injuries is that the horse immediately stops training and is often transported to a facility where it is confined to a stable for rest.  Sickness or disease, much like injuries, can also result in lost competition and training time and stable rest.
The horse’s body responds to both injury and disease in a similar manner.  The immediate visible response of the horse is a depressed appetite, which is usually the result of pain from injury or fever from disease.  Lack of appetite and the body’s need for nutrients to heal often results in weight loss.  This lack of appetite forces the body into a “catabolic” state.  Simply put, catabolism is when the horse breaks down its own body tissues to provide energy.  First the body will break down tissue stores of glycogen (sugar) and fat.  Ultimately, the horse will break down protein from muscle and internal organs to fuel energy requirements.  Visually the horse not only becomes thin, it may also loose muscle mass from the top-line and hindquarters.  This tissue break down begins very soon after the injury or disease and persists until the injury or disease resolves.  In a normal healthy horse, 90% of the calorie requirements come from fat stores within the body and another 5-8% comes from body protein.  In an injured or sick horse, 50% of the calories come from fat stores, 20% from glycogen stores and 30% of the calories come from the breakdown of protein, muscle and internal organs. The immediate goal in feeding a sick or injured horse is to reverse the breakdown of body tissue. The first step is to restore the horses’ appetite.  This can be accomplished by medicating pain symptoms and resolving any infection causing fever.  Once the horse is willing to eat we can address the specific nutrient requirements needed for the healing process.

Nutrient requirements

Feeding horses that are sick or injured is not just a matter of providing hay and water. Sick or injured horses have elevated energy and protein requirements. The energy requirements for a 500kg sick or injured horse vary from 18 to 22 Mcal per day.  The protein requirements for a sick or injured horse are estimated to be 25% higher than a horse that is simply resting.  Together, the nutrient requirements for energy and protein for a sick or injured horse are similar to the requirements of a healthy horse in light work.  So we have an injured horse confined to a stall with elevated nutrient requirements.  This injured horse is accustom to daily exercise but is not physically able to exercise.  We also want to keep this horse calm and quiet to prevent further injury.  These challenges make feeding the sick or injured horse difficult.

Calorie

Let’s first start with the energy (calorie) needs of the injured or sick horse.  What is the best way to provide calories without the horse bouncing off the walls with hyperactive behavior?  Begin by providing the horse with grass hay on a free-choice basis.  Grass hay will provide calories in a slow release manner since it is fermented within the digestive tract.  Furthermore, grass hay keeps the horse occupied as it takes hours to chew and consume the hay.  In addition to grass hay, a small amount (0.5% to 1% of body weight) of lucerne hay or pellets should also be fed.  Lucerne contains more calories per kg compared to grass hay and it is a great source of quality protein and calcium.  This protein and calcium are very important in the healing process.  Soaked beet pulp, such as HYGAIN MICRBEET® can be fed to sick or injured horses as an additional source of calories.  In addition, our nutritionally enhanced chaff nuggets HYGAIN FIBRESSENTIAL also have the outstanding feature of providing digestible energy ranging between that of good quality hay and grains in the form of soluble fiber as opposed to sourcing energy from starches and sugars.  Feeding HYGAIN FIBRESSENTIAL or soaked HYGAIN MICRBEET® instead of grains will minimize the sugar content of the diet and help control hyperactive behavior. Dietary fat in the form of vegetable oil, such as HYGAIN® RBO® – Equine Performance Oil® and HYGAIN TRU GAIN® is also a highly digestible, non-sugar energy source.  Rice bran oil contains roughly three times as many digestible calories as any other feed ingredient with absolutely no sugar.

The energy (calorie) content of the diet is the only dietary factor that adequacy can be judged by looking at the horse.  If you provide the horse with too many calories, it gains weight and eventually becomes fat.  On the other hand, if you do not feed enough calories the horse will lose weight and become thin.  We want horses that are recovering from injury or disease in a healthy body condition, so that the ribs will not be visible, but they can easily be felt when you touch the horse.  Horses that are thinner than that and the ribs are visible will take longer to heal since they lack nutrient intake and body reserves.

Protein

Protein is a vital component of muscle, bone and most soft tissues, and it is a vital nutrient for the healing process. The protein requirements of a sick or injured horse are elevated by 25% over maintenance requirements. Protein is a component of most feed ingredients with the exception of vegetable oil.  Extra protein is most often supplied in the diet with lucerne hay, soybean meal and ground flax.  Soybean meal is typically not fed as a single ingredient, but instead it is found in most grain concentrates and supplement pellets. Since feeds that contain grain also contain large amounts of sugar, which may cause erratic behavior in horses, a low-intake, high protein supplement pellet, such as HYGAIN® BALANCED® is the best means of providing high quality soy protein to sick or injured horses.
The final component that must be addressed in the diet is the intake of vitamins and minerals.  Vitamins and minerals function as building blocks for the repair of damaged tissue.  They also function as co-factors to facilitate the chemical reactions to synthesize or repair tissue within the body.  Critical minerals and vitamins include calcium, phosphorus, copper, zinc, selenium, and vitamins A, D and E, which are all presented in HYGAIN® BALANCED®.

Finally, the management of the horse is critical to the recovery process.  We have discussed putting together a diet that provides adequate energy and protein with:

  • unlimited access to grass hay,
  • Lucerne hay/pellets
  • HYGAIN MICRBEET®,
  • HYGAIN® RBO® – Equine Performance Oil®
  • HYGAIN® BALANCED®,

We have purposely eliminated or at least minimized the grain component of the diet to control the sugar and starch intake of the horse.  This should help to control some of the hyper behavior often seen in horses confined to stables.

The final management component to help injured horses heal is to keep the horse active with in hand walking, grazing and light exercise as soon as the attending veterinarian gives approval.  This exercise will help to stop muscle protein loss and will improve the attitude of sick or injured horses.  In addition, any grazing the horse is allowed to do will provide a source of both energy and protein.  So the next time your horse should have the unfortunate fate of becoming sick or injured, modify the diet as described to help the horse recover quickly.

For more information on feeding the sick or injured horse please contact HY GAIN FEEDS on 1300 HYGAIN (494246) or email us.

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