Horse Jumping

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Horse Jumping

It's not just horseback riders that cough and wheeze at this time of year. Respiratory problems are common in horses as well. Loss of performance may be the first sign that something is wrong. Mildly affected animals may cough occasionally when eating or when starting work. As the condition gets worse they may cough almost continuously.

Why is coughing such a problem in the winter? We need look no further than the changes in management that accompany the colder weather. Horses spend more time inside, often stabled in close proximity to their companions, giving any infection the opportunity to spread. They are exposed to irritants and allergens in the hay and bedding.

Recurrent airway obstruction (also known as COPD, or chronic obstructive pulmonary disease) is the horse equivalent of human asthma . It is an allergic condition, in which the horse reacts to small particles in the air. Chief among the culprits are fungal spores from the hay. This is a problem that seems to be becoming more common - probably due to the lack of good hay for horses.

We seem to have lost the ability to make good hay. Much of the hay fed to horses is dusty, and liberally sprinkled with fungal spores. Under poor storage conditions toxins such as lipopolysaccharides (LPS) can accumulate. These can cause inflammation of the respiratory tract.

Dust from the bedding may make the problem worse. It's important to keep the bed clean and dry. Replacing dusty straw with clean shavings may be a good idea. But if the shavings are allowed to build up into a soggy deep litter bed the ammonia and endotoxins may cause more irritation than the straw ever did, and may make matters worse.

When assessing the air quality in a stable, remember that the horse spends much of his time with his nose close to the ground. The air you breathe in the middle of the stable may be completely different from the air the horse breathes when he's sniffing around the floor or eating his hay.

It can be difficult to differentiate between infectious or environmental causes of coughing. What can be done to investigate the problem? The vet will observe your horse breathing and listen to the chest with a stethoscope. (This is not the time to talk to him or her!)

Respiratory infections may also be involved - in particular, viruses such as influenza, and equine herpes virus. If an infectious disease is suspected, swabs can be taken from the nose to try to identify the organism responsible. Blood samples may contain antibodies to the offending virus.

In persistent cases it may be necessary to collect a sample of fluid from the airways. This is usually done using a flexible endoscope.

Although medicines can be used to help clear the horse's chest and reduce the inflammation, the most important factor in treatment is allowing the horse to breathe clean fresh air.

So how can you prevent your winter schedule being disrupted by coughing? First of all, avoid feeding poor quality hay. Soaking it may help. The water damps down the dust and makes the spores swell. But it also washes the water-soluble nutrients out of the hay and so reduces the feeding value. (If there is any doubt about the hygienic quality of the hay, your veterinarian or feed merchant may be able to have a sample tested to see if it is safe to feed.) Consider feeding haylage instead.

Let your horse have as much fresh air as possible. Turn out as much as the weather conditions allow. Make sure there is adequate ventilation in the stable or barn. Avoid the temptation to close the stable up, even in the coldest weather. Keep the bed as dust-free, and as clean, as possible. Do not muck out the stable with your horse in it. Give the bedding time to settle - preferably an hour or more - before bringing the horse back inside.

Give your horse clean air to breathe, and hopefully you will both enjoy a cough-free winter.

Copyright 2005 by Mark Andrews / Equine Science Update. This article may be freely used by newsletters and web sites without permission as long as the copyright notice, links and contact information remain unchanged. Mark Andrews, an experienced equine veterinarian, is author of The Foaling Guide, http://www.thefoalingguide.com and publisher of Equine Science Update. For the latest information in equine science, subscribe to the free newsletter from Equine Science Update. (http://www.equinescienceupdate.co.uk)

Horse Jumping