January 2015- Vitamin A Vitamin A comes in two forms – as retinol, of animal origin, or as beta-carotene which is of vegetable origin. As a precursor of vitamin A, beta-carotene needs to be activated in the body. Retinol is usually not included in typical horse feeds, while beta-carotene is found in appreciable amounts in roughages and in small amounts in grains other than maize. The biological activity of the various vitamin A compounds and precursors differ. One international unit (IU) of vitamin A is defined as the biological activity…
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