
Introduction
The task of commercial nutritionists is to meet the nutrient requirements of animals through judiciously
selecting and mixing several ingredients, in a most economical, ethical, and environmentally friendly way.
The nutrient requirements of an animal vary depending not only on its biological parameters such as genetic potentials, sex, and growth and reproductive stages, but also on performance parameters that are examined. For example, it is known that a higher dietary methionine content is needed to maximize breast meat yield than body weight for broiler chickens. Although variable and complicated, the nutrient requirements of an animal under given conditions have been extensively investigated and relatively well documented (see, for example, NRC, 1994).
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