Vitamin supplementation in horses is generally not needed because popular feeds normally contain decent portions. Vitamin A is found in green leafy crops or yellow grain like corn, yet may well be deficient in winter months any time green grass is inaccessible and when hay quality is terrible. Vitamin D is necessary for calcium supplement and phosphorous deposition in bone development. 23 Feb, 2011
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Source: http://EzineArticles.com/5931127
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