The nutritional needs of vitamins are less defined for horses compared to other livestock species. Vitamin ration supplements are common because the vitamin content of many stored rations or pellet rations is marginal or inadequate for proper horse growth and development.
In many cases, veterinarians and nutritionists may not have enough information to evaluate or develop optimal rations. If you're looking for horse vitamin supplements, you can browse this source: Horse Vitamins – Pre-Race Supplements – Shop Online: AECS
The optimal amount of vitamins in the ration can be influenced by many factors. Rations that are formulated for the pleasure of a horse or horse performance may be very different from vitamins.
Other factors including race, season, age, pregnancy, and disease can change vitamin requirements (1-5).
Long winters that determine the consumption of food stored for long periods of time can further complicate the nutrition of vitamins A and E, because the stability and retention of these vitamins in stored food is very poor (6).
Two important liposoluble vitamins are in horses are vitamin A and vitamin E. Vitamin A (retinol) has been linked to various disease conditions (2).
Vitamin A is needed for vision, epithelial and bone cell development, and for reproduction (6,7). Reducing resistance to diseases, congenital defects, nerve degeneration, infertility, weight loss, night
blindness, and nail defects can also be observed with vitamin A deficiency (2). Vitamin E (a-tocopherol) is an antioxidant, which is needed to prevent lipid peroxidation and membrane damage.
In horses, muscular dystrophy is a responsive condition of vitamin E / selenium, manifested by weakness, trembling, rigid gait, and supine (2).