Magnesium and Horses!
Magnesium requirements of a 500 kg horse are 94 gm/kg of weight. Deficiency in magnesium can cause horses to be stressed, nervous and anxious. Magnesium is needed to help produce some of the hormones that regulate the adrenaline response to keep the horse calm. Lack of magnesium in the diet can lead to increased respiratory rates (the horse takes more breaths per minute), muscle tremors, loss of appetite and aggressiveness or ill temper. Magnesium is crucial to the deposition of calcium into the bones, which can prevent calcium deficiency.
For help in calculating how much your horse weighs, you can learn in this handy article. To convert lbs to kgs, multiply your horse's weight in pounds by .4535 and you will have his weight in kilograms!
Thanks to Grand Meadows for sharing their infinite nutrition wisdom!