Journal
JOURNAL OF EQUINE VETERINARY SCIENCE
Volume 35, Issue 10, Pages 785-792Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jevs.2015.06.010
Keywords
Ergocalciferol; Cholecalciferol; Nutrition; Physiology; Roughage; Horse
Categories
Funding
- Aarhus University, Department of Animal Science
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Very few references on vitamin D in horses exist, but the limited research available suggests that the vitamin D physiology of horses may be very different from other species. Horses can obtain vitamin D both through endogenous synthesis in the skin during sunlight exposure and through dietary sources either from synthetic vitamin D supplements or the natural vitamin D content of roughages. However, regardless of the source of vitamin D, circulating levels of vitamin D metabolites in plasma are generally reported to be very low in horses and vitamin D appears less involved in maintaining normal calcium and phosphorus homeostasis in horses than in other species. Current recommendations on the vitamin D supplementation of horses are based on a scarce amount of more or less outdated literature. Very little research has been carried out regarding the vitamin D physiology of horses and even less regarding the efficiency of different sources of vitamin D in the nutrition of horses. Furthermore, the use and management of horses has changed dramatically during the last 25 to 50 years. Hence, research in the vitamin D physiology and nutrition of modern riding horses is highly necessary, before a much needed update on the recommended vitamin D supplementation of horses can be carried out. (C) 2015 Elsevier Inc. All rights reserved.
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