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Unsung Trace Mineral Heroes
Q. I see that the trace minerals copper, zinc, iron, and selenium get talked about a lot, but I see others such as manganese and iodine mentioned on feed labels and supplements. I know copper and zinc are important for hoof and coat quality, iron is an important constituent of hemoglobin, and selenium is important for muscle function. But what do the other trace minerals do?
A. This is a great question, and you are right: We spend a lot of time talking about copper and zinc because they are often deficient in forage-based diets. Selenium can be too low, as well, or it might be too high, causing toxicity. However, manganese, iodine, and cobalt are also important and get far less press.
Manganese: Essential for Fat and Carbohydrate Metabolism
Manganese is essential for fat and carbohydrate metabolism. What might surprise many horse owners is that it also plays a role in the synthesis of chondroitin sulfate, which in turn is needed for cartilage formation. Many of my clients are keen on using joint supplements, most of which contain chondroitin sulfate. I’m not opposed to using (good-quality) joint supplements; however, doing so if the horse’s base diet is lacking in manganese seems unproductive. My recommendation is to ensure your horse is consuming enough manganese that he can manufacture his own chondroitin sulfate, and then from there consider supplementation
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Written by:
Clair Thunes, PhD
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