Abstract
The main purpose of this symposium was to place vitamin nutrition for animals in the proper perspective. Vitamins have been defined generally by Davidson et al. (1959) as organic substances which the body requires in small amounts for its metabolism yet cannot make for itself, at least in sufficient quantities, from proteins, carbohydrates, or fats. Essentially, they are not related chemically and differ in their physiological actions. Without adequate amounts of vitamins in the diet, animals are unable to utilize efficiently other feed nutrients.Many changes have occurred in NRC vitamin requirements for animals during the past 30 years. As the knowledge of vitamin nutrition continues to increase, based on new research findings, additional changes in the NRC vitamin requirements will undoubtedly be made.Because of the variability and uncertainty of factors influencing the needs of animals (“influencing factors”), vitamin allowances must often be adjusted to levels greater than the .
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