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Exertional Rhabdomyolysis, Tying-up, Azoturia, Monday Morning Sickness and Poly Saccharide Storage Myopathy are all names of common muscle metabolism problems.
The scientific name for Tying up is rhabdomyolysis, which simply translated means muscle (myo) breakdown (lysis).
The causes are several but the result is the same, muscle cramping. In this condition there is massive contraction of the muscle groups along the back and rump of the horse. The muscles contract and do not relax.
The horse will appear to be nailed to the floor in the back end while seemingly being able to move the front end without any problems. They will appear to be in significant pain. When you press your hands along the muscles on either side of the spine, they feel rock hard. The horse's temperature may elevate up to 40 or 40.5 degrees.
If the cramping is severe enough then the myoglobin released from the damaged muscle goes from blood to kidneys and into the urine, turning the urine a dark red colour. Eventually this can cause severe problems with the kidneys. Most cases of Tying up are not that severe and usually present in a horse that has been off for several days and is then exercised aggressively. In the middle of the ride (or sometimes right at the end) the horse's stride shortens and he cramps up.
Muscle disorders are a frequent cause of poor performance in horses and 'Tying up' is the most common syndrome. It is often mistakenly assumed that any horse with muscle pain or cramping after exercise has 'tied-up', and because of this there is a lot of confusion and controversy around the diagnosis, causes and management of affected horses. However, although a number of different muscle conditions produce the same signs, there are basically two types of true 'Tying-up': Acute and Chronic.
The signs of tying up vary with the severity of the condition and the speed of onset. In mild cases, the horse's gait gradually stiffens and he becomes reluctant to move. The muscles are actually cramping and feel very much to the horse like muscle cramps do to human athletes.
The large, heavy muscles of the hind legs are most often affected, but the triceps muscles above the elbow of the front legs may also appear stiff and painful. The horse often begins sweating profusely, his heart and respiratory rate may also increase dramatically.
The affected horse may appear to be colicing, but the major difference is that in horses that are tying up, the large muscle of the hind legs will be firm or very hard and the horse will paw the ground or attempt to lie down.
In extreme cases of tying up, the large muscles of the hind legs may actually appear to bulge. If there is enough muscle damage, the horse's urine will turn a dark, reddish-brown colour as the damaged muscle fibres release myoglobin, which then passes in the urine.
Horses that tie up usually have a recurring problem, associated with a specific set of circumstances. When horses worked for a living, a common problem was "Monday morning's disease." This problem occurred when horses, which were working all week, did not have their grain cut back while resting over the weekend.
Some horses tie up when they become excited, at a show, breeding, or travelling. Other horses develop the problem when exercised. Occasionally you run into the horse that ties up for no reason you can detect.
Moderate to severe cases are not hard to diagnose. The stiffness in the rear limbs and hard painful muscles are easily seen. But mild cases may present as decreased performance or a vague lameness originating in the back or hind end.
In cases of possible tying up the diagnosis can be confirmed with blood tests for increase levels of muscle enzymes.
A horse that is prone to tying up can be sensitive to several different things. It may not be feasible or necessary to fix them all. Learn what factors trigger an attack in your horse and work to minimize those. Work with training, spelling, feed, and environmental stress. Keep a diary to look for patterns.
There have been several proposed causes for Tying up. The different histories, and varying treatments that horses respond to, strongly suggest that we are looking at several different diseases. Some proposed causes are:
HYGAIN® RELEASE® is specifically formulated for high performance horses prone to tying-up. HYGAIN® RELEASE® is designed to be low in starch (carbohydrates), high in fat and to be fed with more roughage than is usually fed to performance horses. HYGAIN® RELEASE® is also high in Vitamin E & C as well as selenium, magnesium and calcium. Lower starch alternatives for equestrian horses in training and competition include HYGAIN® SHOWTORQUE® a high fat, cereal grain free feed for horses in moderate work. If horse's are very sensitive to starches and sugars in their diet and are not in work, we recommend HYGAIN ZERO our lowest starch and sugar complete feed. It is imperative when you are using an electrolyte that is balanced, which means feeding your horse the same levels of electrolytes that are lost. When grains are processed such as micronized or extruded, the starch is rapidly digested in the small intestine which reduces the burden on the large intestine. An over burden on the large intestine can result in problems such as colic, laminitis and tying up. All grains used in HYGAIN® feeds are either micronized or extruded.
A mild case of Tying up may be treated with a nonsteroidal anti-inflammatory (i.e. Phenylbutazone) and rest for 3-5 days with a gradual increase in exercise. A decrease in training intensity and grain intake will usually be recommended.
Sedatives such as Acepromazine which causes sedation and relaxation by depressing the central nervous system, may be given to decrease the anxiety and spasms after the horse ties up. In some chronic cases, Acepromazine may be used in a preventative effort prior to exercise, to help promote vasodilatation or opening of the outlying blood vessels.
Veterinarians may give the horses immediate intravenous Thiamine or intramuscular Vitamin E and Selenium injections to aid return to health or monthly prophylactic injections to decrease potential onset of tying up episodes. Horses exhibiting severe symptoms of tying up may be treated with intravenous fluids to decrease potential kidney damage due to the myoglobin excretion and shock.
Nonsteroidal anti-inflammatory drugs and/or painkillers may be necessary during recovery time. As with mild cases, a sedative may be used to decrease the anxiety and help prevent thrashing or excess movement.
In severe cases, it is critical to limit movement to decrease potential permanent muscle damage. Recovery time may be up to 6-8 weeks, and ability to return to work will vary with severity.
Horses that suffer from chronic attacks of tying up can often be managed successfully with strict exercise, management and diet protocols. A diet balanced for mineral and vitamin needs that provide a good quality hay, fresh water, and minimal grain may be adequate to control some cases of chronic tying up.
Management strategies that reduce stressful situations and provide a consistent and calm environment may help as well. Some horses may need to be maintained on sedatives prior to exercise or daily medication to decrease or prevent muscle damage during tying up episodes.
While the chemistry of Tying up is understood, the factors contributing to it are not as clear. Besides consuming too much unprocessed grain for their activity level, horses may also tie up as a result of dehydration, glucose depletion, electrolyte imbalances, mineral and vitamin deficiencies, over exertion, nervousness and hormonal fluctuation.
Due to the multiple causes of this condition, it is important to have a thorough veterinary examination to determine which factors are involved for each horse, so that an accurate treatment and management plan can be developed.
The examination may include blood and urine tests, muscle biopsies and an exercise challenge test. One final point deserves emphasis - there is no cure for horses with chronic forms of Tying-up, such as RER and PSSM. These conditions have also been shown to be inherited in some bloodlines. The key to combat these disorders is vigilant management of your horse.
With the correct management of nutrition and exercise the chances of your horse Tying up should be reduced.
Library | 08.08.23
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