Each of the fat-soluble vitamins has a unique and interesting history. Their discovery was initially from deficiency observations, with chemical structures and functions later elucidated by scientific investigation. The fat-soluble vitamins are involved with tissue growth and maintenance. Grains, forages, and sunlight, in the case of vitamin D, provide animals with a supply of each vitamin, but there is great seasonal variation. Consequently, synthetic forms of each are equivalent to the active forms of the natural sources of the vitamins. The NRC publications1-4,5,10,11-1 apply research findings to domesticated animals.

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