My 16-hand (163-cm) Anglo-Arabian is in good weight for his sport, just below optimal body condition. He’s in training year-round for competitive endurance riding, working towards 100-mile rides. He’s fed 2 lb (0.9 kg) of senior feed, 1 lb (0.45 kg) unmolassed beet pulp pellets, 0.5 lb (0.23 kg) whole flaxseed, 1 lb (0.45 kg) timothy pellets, one flake (3 lb, 1.4 kg) of quality hay, and free grazing. He was diagnosed with insulin resistance and hypothyroidism two years ago, but we manage that with diet control and exercise. Other than this, his health seems fine except for some hoof issues. He’s been a bit lackluster under saddle lately. I am worried about his electrolyte balance as we begin to step up the distance. I use a combination of electrolyte and homemade lipid-coated salt, but I would like to know more about calcium, magnesium, and selenium in relation to our region and supplementation.
Your current feeding program is not providing sufficient quantities of certain trace minerals–namely selenium, copper, and zinc–to meet recommendations for endurance horses...