462 - 61997Applied Poultry Science, I nr USEOF THE...

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61997 Applied Poultry Science, Inr USE OF THE IDEAL PROTEIN CONCEPT FOR PRECISION FORMULATION OF AMINO ACID LEVELS IN BROILER DIETS' JASON L. EMMER? Department of PouItry Science, 0-202 POSCBuilding, 1260 West MapIe Street, University of Arkansas, Fayetteville, AR 72701 Phone: (50I) 575-3595 DAWD H. BAKER Department of Animal Sciences, Universiv of Illinois, Urbana, IL 61801 FM: (501) 575-8775 Primary Audience: Nutritionists, Research Scientists, Veterinarians DESCRIPTION OF PROBLEM Sophisticated computer feed formulation programs have made precision nutrition a realistic goal. Such programs can assess nu- merous parameters, including nutritive quality of feed and feed ingredients and economic factors. Growing concerns about the environ- mental impact of animal production may lead to the addition of environmental factors such as nitrogen and phosphorus pollution as parameters in feed formulation schemes in the future. Because it provides a precise ratio of amino acids andminimizes nitrogen excretion, the ideal protein concept can play an integral role in precision nutrition, particularly as non- traditional protein-containing ingredients become increasingly available. ILLINOIS IDEAL CHICK PROTEIN Illinois Ideal Chick Protein (IICP) is based on a concept developed by H. H. Mitchell and H. M. Scott at the University of Illinois in the late 1950s and early 1960s. The 1 Presented at the 1997 Poultry Science Association Informal Poultry Nutrition Symposium: 2 To whom correspondence should be addressed "Precision Nubition for Poultry. "
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EMMERT and BAKER ~ ~ AMINO ACID^ Lysine Methionine + Cystine Methionine Cystine Threonine Valine Arginine Symposium OTO 21 DAY? 21 TO 42 DAYS^ IDEAL RATIO IDEAL RATIO IDEAL RATIO 70 of Lysine % of Lysine 70 of Lysine 1M) 100 100 72 75 75 36 37 37 36 38 38 67 70 70 77 80 80 105 108 108 42 TO 56 DAYS' 4.63 basic goal is to provide a blend of indispens- able amino acids that exactly meets an animal's requirement for protein accretion and mainte- nance, with no deficiencies and no excesses. The ideal protein concept uses lysine as a ref- erence amino acid, with the requirements for all other indispensable amino acids expressed as a percentage of lysine. Lysine was chosen as a reference amino acid for several reasons: 1) in practical broiler diets, lysine is the sec- ond-limiting amino acid after SAA, and lysine supplementation is economically feasible, 2) lysine analysis in feedstuffs is straight- forward, 3) dietary lysine is used only for protein accretion and maintenance (i.e., it has no precursor role), and 4) lysine requirement data for a variety of dietary, environmental, and body compositional circumstances are readily available. Table 1 shows a portion of the IICP profile, including those amino acids typically considered most important in prac- tical broiler diets (lysine, SAA, threonine, valine, arginine). For further information re- garding the development of IICP, see Baker and Han [l] and Baker [2]. The use of lysine as a reference amino acid
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462 - 61997Applied Poultry Science, I nr USEOF THE...

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