According to
Ohio State University Equine Extension,
vitamin
D is called the sunshine vitamin because the ultraviolet rays of the sun convert
a compound in the skin into vitamin D. Horses exposed to four to six hours of
outdoor light (even on cloudy days) will make sufficient vitamin D. Also,
sun-cured forages contain vitamin D. If a horse is not exposed to the sun, or
is fed poor-quality hay, a vitamin D deficiency could occur.
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