Additional resources on vitamin and mineral supplements for horses:
Comben, N., R.J. Clark, and D.J.B. Sutherland. 1984. Clinical observations on the response of equine hoof defects to dietary supplementation with biotin. Vet. Rec. 115:642-645
Dehydration and Electrolyte Losses in the Sport Horse - Tuffs Cummings School of Veterinarian Medicine (http://www.tufts.edu/vet/sports/dehydration.html)
Kempson, S.A. 1987. Scanning electron microscope observations of hoof horn from horses with brittle feet. Vet. Rec. 120:568-570.
Kubota, J., W.R. Allaway, D.L. Carter, E.E. Cary and V.A. Lazar. 1967. Selenium in crops in the United States in relation to selenium-responsive diseases of livestock. J. Agric. Food Chem. 15:448.Lakin
Josseck, H., W. Zenker, and H. Geyer. 1995. Hoof horn abnormalities in Lipizzaner horses and the effect of dietary biotin on macroscopic aspects of hoof horn quality. Equine Vet. J. 27:175-182.
Nutrient Requirements of Horses. Sixth Revised Edition. 2007. National Research Council. Academic Press.
Schott, H. Do electrolytes really help during endurance exercise? Michigan State University College of Veterinarian Medicine website.
Van Saun, R.J. 1997. Assessing the Nutritional Status of the Horse. World Equine Vet. Review. Vol. 2:No. 4. 15 - 21.
Van Saun, R.J. 1998. Assessing the Nutritional Status of the Horse: Macronutrient Evaluation. World Equine Vet. Review. Vol. 3:No. 1. 34-39.
Williams, C., L. Atherly, J. Hirsch. 2007. Antioxidants and Your Horse. Rutgers University Fact Sheet #1065.
Williams, C. and E. Lamprecht. 2008. Some Commonly Fed Herbs and Other Functional Foods in Equine Nutrition: A Review. Veterinary Journal 178: 21–31.
Zenker, W., H. Hosseck, and H. Geyer. 1995. Histological and physical assessment of poor hoof horn quality in Lipizzaner horses and a trail with biotin and a placebo. Equine Vet. J. 27:183-191.