Fall Grasses Increase Risk of Laminitis

Written By: Juliet M. Getty , PhD.

As temperatures begin to dip, Dr. Juliet Getty, equine nutrition specialist, wants your horse to make the transition to winter feeding in good shape, and that means understanding about the sugar and starch that lurk in your fall pasture growth.  If you have horses that are overweight, insulin resistant, or suffer from equine Cushing’s disease, you know about keeping them off of spring grasses. The non-structural carbohydrate (NSC) content is too high for free-choice grazing to be safe, increasing the risk for laminitis. But don’t think you're out of the woods once spring is over. True, summer is safer, but as early fall nights cool down below 40 degrees F for the majority of the night, the dangerous carbohydrates once again increase. Grass accumulates NSC (sugars and starch) as it is exposed to sunlight. The levels reach a peak in the late afternoon. During the dark hours, the grass uses this fuel for itself, and by morning, the levels are at their lowest. But cold nights prevent grass from using as much NSC, resulting in a higher NSC concentration during the day. Don’t be fooled by the brown grass you see in the late fall. Spread it apart and you’ll likely see some green at the base, which is high in sugar and starch. If it hasn’t rained in a while, your grass will look dried out; but be careful – dry grass can actually have a higher NSC percentage than long, lush-looking grass.

Testing your pasture every couple of weeks may be a good option this time of year. Equi-Analytical Labs offers their economical "Fast Track" test that provides sugar and starch levels. Though just a snapshot of what is happening to the grass at that moment in time, consistent testing will provide a trend that may offer some peace of mind in determining when the grass has gone dormant for the winter.

 

Juliet M. Getty, Ph.D. is an independent equine nutritionist with a wide U.S. and international following. Her research-based approach optimizes equine health by aligning physiology and instincts with correct feeding and nutrition practices.

Dr. Getty’s comprehensive resource book, Feed Your Horse Like a Horse, is available at www.GettyEquineNutrition.com -- buy it there and have it inscribed by the author, or get it at Amazon (www.Amazon.com) or other online retail bookstores. The seven separate volumes in Dr. Getty’s topic-centered Spotlight on Equine Nutrition series are available with special package pricing at her website, and also at Amazon in print and Kindle versions. Dr. Getty’s books make ideal gifts—check her website for holiday specials.

2 thoughts on “Fall Grasses Increase Risk of Laminitis”

  • Melanie Davis

    Thank you for this article "Fall Grasses Increase Risk of Laminitis". I thought the colder temps at night increased sugar/carbs in grasses. What I didn't know is that even though my pastures look more brown than green this time of year, that they could still produce NSC. I'm very careful not to let my mares on pasture too long in the spring and most of the summer. I'm a bit more lax this time of year. I'll change my ways and look into options on having my grasses tested. Good information!

    Reply
    • Omega Fields

      Thank you Melanie for taking the time to post a comment. So pleased that you enjoyed the article and that you found it educational!

      Reply
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