Nutrient Requirements

Research continues on the nutrient requirements and interactions in all classes of livestock, companion animals, fish, and laboratory animals. These are summarized in a publication series Nutrient Requirements of Domestic Animals by the National Academy of Science-National Research Council (NAS-NRC) that are revised periodically (15). This series incorporates computer models to predict nutrient requirements based on genetic variance, environmental conditions, and the use of various production technologies. These are used by feed companies, animal practitioners, consultants, producers, and teachers as guides to formulating diets that will meet the nutritional requirements of animals, generally with some safety margin, from feeds typically consumed and therefore palatable to a particular animal. Many animal feeding guides are also available from state extension offices, animal associations, feed companies, and veterinarians.

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