The National Research Council (NRC) creates nutritional requirements for each species. With horses they use a calculator that factors in specific things for each individual horse in order to be certain the horse’s nutritional needs are being met.
As you could probably figure out, a race horse needs a different diet than a pasture ornament. A warm blood broodmare has different dietary needs than a miniature horse.
I found this horse feed calculator that is VERY similar on HorseMath.com Click this link and fill in the necessary info to determine what your horse(s) needs and to see if his current diet meets them.
All B vitamins help the body convert food (carbohydrates) into fuel (glucose), which is used to produce energy. B vitamins, often referred to as B complex vitamins, also help the body use fats and protein. B complex vitamins are needed for healthy skin, hair, eyes, and liver and they also help the nervous system function properly.
Vitamins are a class of nutrients that are required in small amounts by the horse. Vitamins can be divided into two types; fat soluble and water soluble. B Vitamins are water soluble so therefore are not stored in the fat and can be more safely added to a horse’s diet without risk of toxicity. Vitamins that are water soluble are excreted from the body on a daily basis in the urine.