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Is your horse a candidate for a grazing muzzle?

is your horse a candidate for a grazing muzzleThe horse has evolved as a grazing animal, hence, pasture plays a pivotal role in equine nutrition.  Reported intakes of fresh pasture by horses can range from 1.5 to 5.2 % of body weight per day. With such a large intake of pasture possible, can horses over consume?  What components of pasture grass can cause problems if taken in at excessive levels?

What’s in grass?

Pasture has been implicated in the onset of several metabolic disorders in horses.  During photosynthesis, green plants ‘fix’ atmospheric carbon dioxide in the presence of light, resulting in the production of simple sugars. When sugars are produced in excess of the energy requirement of the plant for growth and development, they are converted into storage, or ‘reserve’ carbohydrates.  These carbohydrates make up the non-structural carbohydrate (NSC) fraction of the plant.  These non-structural carbohydrates follow a seasonal pattern with highest values in spring compared to summer and winter, and intermediate values in the autumn.  The over consumption of non-structural carbohydrates by grazing horses has been implicated with disorders including insulin resistance and laminitis.

Excess grass consumption

In addition to sugar and starch (NSC) causing metabolic issues, the sheer over consumption of pasture grass can cause obesity in horses.  Obesity can result in further problems such as insulin sensitivity as body fat mass increases.  Over-weight in horses can result in a cascade of problems that at the very least leaves your horse fat and intolerant of exercise to far more severe conditions such as insulin insensitivity and laminitis.  It has been reported that excessive pasture intake accounts for nearly 50% of all reported cases of laminitis.  Obesity therefore must be corrected.

Setting up a new diet

Hygain BalancedThe first step in any weight reduction program is calorie control.  Elimination of all grain from the diet is a logical step for overweight horses. A low intake vitamin and mineral supplement pellet such as HYGAIN® BALANCED® should be added to the diet as a means of supplying key nutrients to the horse without excess calories. Another key to success is limiting or eliminating access to pasture. Pasture grazing represents an unregulated source of calories that cannot be easily quantified. It is therefore necessary to limit pasture access until weight loss has been achieved.

Grazing muzzles and how they work

Physical prevention of excessive pasture intakes by horses can be achieved using grazing muzzles. Grazing muzzles may be favoured by owners over other methods of intake restriction that limit animals to very short turnout times or confinement to stables or small bare paddocks. Grazing muzzles enable the animal to graze larger areas and for longer periods and owners do not have to implement severe changes to their facilities.  In addition, a horse that is allowed to graze with a muzzle continues to move around in the paddock and get some exercise.
While grazing muzzles are recommended to reduce pasture intake there is limited data on their effectiveness.  A recent study utilizing ponies aimed to determine the extent of intake restriction imposed by grazing muzzles. Ponies fitted with grazing muzzles on average ate approximately 83% less forage than those without grazing muzzles. Ponies with muzzles were only able to consume 0.14 % of their body weight during 3 hours. Grazing muzzles appear to be an effective means of restricting pasture intake by ponies.

 

Does my horse/pony need a grazing muzzle?

The first step in determining if your horse is a candidate for a grazing muzzle is to determine its laminitis risk.  It is generally accepted that ponies are more commonly affected by laminitis than horses. Ponies and horses that have been previously affected with laminitis or are affected with other diseases (e.g. Cushings disease or insulin resistance) are at higher risk of developing laminitis. For those animals identified at high risk of developing laminitis a grazing muzzle may be necessary.  A less radical solution compared to using a grazing muzzle would be to restrict pasture access by controlling the amount of time they graze.  Simply restrict the grazing opportunity to two hours or less per day.  Further, grazing can be restricted during times of high risk such as during spring and autumn.

How and when to use the grazing muzzle?

The pasture is the most dynamic and most dangerous component of the diet if the horse has previously suffered from laminitis. If an affected horse is returned to pasture, use of a grazing muzzle is recommended to limit grass intake. Grazing muzzles can be worn every day or only during months when the pasture grass is more abundant and contains higher concentrations of non-structural carbohydrates. Turnout on pasture should be avoided when the pasture grass is growing rapidly in spring after the weather turns warmer or during summer after heavy rain. Temperate pasture grasses also accumulate sugar when they are stressed by drought or the onset of winter. When a horse is returned to pasture after being confined to a stall, reintroduction should occur gradually with no more than 1 hour of grazing at a time for the first 2 weeks.

Management strategies for using grazing muzzles

  • The muzzle should be attached to a breakaway halter and the fit should be checked often. The extra weight of the muzzle adds more pressure to the bridge of the nose than usual, and pressure sores can sometimes develop.  Encasing the noseband in fleece may provide relief.
  • Introduce the muzzle slowly by introducing the muzzle for short periods in the stable and rewarding your horse with a treat through the hole in the muzzle each time you put it on and take it off.  As you progress outside with your horse wearing the muzzle, feed grass through the hole so your horse gets the idea that he can still eat.  Initially leave the muzzle on for short periods gradually building up the time your horse grazes with the muzzle on.
  • Make sure that your horse is comfortable drinking with the grazing muzzle on.  Try this in the stable first by offering a bucket of water directly to your horse in hand and you will find they are quick to investigate, especially if you have been offering treats through the hole in the muzzle!
  • Make sure the muzzle fits correctly as this will help prevent your horse removing it.
  • Don’t leave the muzzle on all day.
  • When your horse is not wearing the grazing muzzle bring them in off the grass as they are able to graze freely and may even try to compensate for the restriction earlier in the day.
  • Beware of herd dominance and make sure the horse wearing the muzzle is not being bitten by others in the group.

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One Response to Is your horse a candidate for a grazing muzzle?

  1. Blue Ridge Horse Blankets July 24, 2015 at 11:16 am #

    Howdy Folks;

    After looking through several articles on grazing muzzle management I came upon yours. It had exactly what I was looking for. How to moniter the horse during the initiation of the muzzle, water consumption and feeding by hand through the hole in the bottom with treats and grass when putting on and taking off. Great suggestions and I just wanted to thank you for the great insights. I went right out and pulled the muzzle off for the night since it was Freckles first day wearing it.

    As far as herd domination he uses his heels on the others so I figured the muzzle wouldn’t spare the others!!

    Best Regards Blue Ridge Horse Blankets

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