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The nutritional value of feed ingredients comprises all nutrients needed for the maintenance and production of animals. The nutritional value of feed ingredients is primarily dependent on the contents of energy-supplying nutrients (starch, fat, and protein), amino acid-supplying protein, and the efficiency of digestion and absorption in the gastrointestinal tract. Although the chemical composition of feed ingredients can be analyzed accurately by wet chemistry or NIR, nutrient digestibilities may vary between batches of the same feedstuffs and between poultry species. Parameters to predict nutrient digestibilities and/or to distinguish between high and low-quality feed ingredients should be quick, accurate, and cheap.

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