Laminitis research: Even healthy older horses have increased insulin responses

New research, conducted in collaboration with the SPILLERS® horse feed company in Great Britain shows that even healthy older horses have increased insulin responses, compared to younger horses, in response to a starch-rich or starch- and sugar-rich meal.

Grazing Muzzles: New research shows grass length affects grazing behavior

It’s that time of year. The grass in the pastures is waking up and springing to life. But animals at risk for laminitis require effective strategies to prevent weight gain and overeating that may trigger insulin dysfunction and possibly lead to mild or even severe laminitis and changes in the structure and integrity of the hoof that could cause diminished performance, even if the horse is not overtly lame.

For many horse owners, the first line of defense is a grazing muzzle, even if their horses do detest wearing them. What are the latest findings on how they affect horses?

Equine Obesity Research: Breeds Respond Differently to Changes in Diet and Exercise

Does it take a university research study to prove that horses need exercise and diets?

If spring weight gain isn't on horse owners' minds right now, it will be soon. Many horses now come through the winter in robust condition, thanks to modern feeds, warm barns, snuggly blankets and owners who don't ride often in winter...if ever.

Autumn Laminitis Warning: Restrict Grazing During Fall Months When Grass Risk is as High as Spring

(The following health alert was received from Spillers Feed/Waltham Trust and is not an original post.)

We all know that spring is a dangerous time for laminitis but it is important to remember that the second flush of grass in autumn can be just as risky. We get numerous calls during the autumn from worried owners wanting to know what they can safely feed laminitis prone ponies and how to manage those that have suffered a further attack.

Laminitis is second only to colic as the most common reason for presenting a horse for veterinary treatment. In a recent study in the UK it was found that over 1 in 10 horses were affected by laminitis with a greater prevalence during times of high grass growth. Work completed in the USA has also found that an overload of lush grass or cereals ("grain") is the cause of laminitis in more than 50% of the cases reported.

Recent research has identified a grass-storage carbohydrate called "fructan" as a possible trigger for laminitis; however, the level of fructan in pasture is difficult to estimate, as it varies because of the type of grass and the climatic conditions. Until further work is done to more accurately assess fructan concentrations in grassland and the exact mechanisms are identified as to how a hindgut disturbance can cause laminitis, the best way of reducing the risk is to follow these simple guidelines:

1. Restrict access to pasture at high risk times (spring and autumn) by strip grazing, grazing ponies with sheep and turning out in a bare paddock. In the case of known laminitics, avoid all grazing;
2. Turn your horse or pony out at night, as this is when the fructan concentrations are likely to be at their lowest;
3. Feed a high fibre, low starch diet. Choose a feed approved by The Laminitis Trust such as SPILLERS HAPPY HOOF® or High Fibre Cubes;
4. Put your pony on a diet to reduce bodyweight if he is overweight, but do not starve him;
5. Don’t feed high cereal (grain) mixes as these can increase the risk of another attack.

To learn more about insulin resistance in horses, visit
http://www.ecmagazine.net/ecSummer06/insulinResistance.htm

New Laminitis Research from England's Waltham Equine Studies Group

Mark Andrews, our intrepid colleague in England, has published a new edition of his "Equine Science Update", a handy newsletter about equine research and practice. He has written a summary of the scientific output from Waltham's Equine Studies Group in 2004 and 2005 .

Several studies considered the nutritional aspects of laminitis. One showed that grasses with lower nutritive value (such as timothy), or pastures with lower water soluble carbohydrate (WSC) levels are associated with slower fermentation in the colon. Consequently they may be less likely to cause acidosis of the hindgut contents.

Another study demonstrated the existence of marked insulin resistance and / or hyperactive insulin secretion in ponies prone to laminitis.