HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Emmert, J. L. Articles by Baker, D. H. Search for Related Content PubMed Articles by Emmert, J. L. Articles by Baker, D. H.

Use of the Ideal Protein Concept for Precision Formulation of Amino Acid Levels in Broiler Diets

Department of Poultry Science, 0-202 POSC Building, 1260 West Maple Street, University of Arkansas, Fayetteville, AR 72701; Phone: (501) 575-3595; FAX: (501) 575-8775

David H. Baker

Department of Animal Sciences, University of Illinois, Urbana, IL 61801

Correspondence: Jason L. Emmert

Ideal amino acid ratios for chicks during the early growth period (0 to 21 days) are well documented by empirical evidence, but suggested ratios for older birds are in need of confirmation. Based on best empirical estimates of lysine, SAA, and threonine requirements of broiler chicks during 0 to 21, 21 to 42, and 42 to 56 days of age, together with new knowledge of maintenance contributions to the total requirement for these amino acids, it appear that the ideal ratio of SAA and threonine to lysine may change very little as birds advance in age and weight toward a 56-day market weight. This paper presents regression equations that predict both digestible and total lysine, SAA, and threonine requirements at any age or weight between hatching and 56 days.

Key Words: Ideal ratios • lysine • maintenance • sulfur amino acids (SAA) • threonine

This article has been cited by other articles:

				K. Bregendahl, S. A. Roberts, B. Kerr, and D. Hoehler Ideal Ratios of Isoleucine, Methionine, Methionine Plus Cystine, Threonine, Tryptophan, and Valine Relative to Lysine for White Leghorn-Type Laying Hens of Twenty-Eight to Thirty-Four Weeks of Age Poult. Sci., April 1, 2008; 87(4): 744 - 758. [Abstract] [Full Text] [PDF]

				D. M. Lucas, M. L. Taylor, G. F. Hartnell, M. A. Nemeth, K. C. Glenn, and S. W. Davis Broiler Performance and Carcass Characteristics When Fed Diets Containing Lysine Maize (LY038 or LY038 x MON 810), Control, or Conventional Reference Maize Poult. Sci., October 1, 2007; 86(10): 2152 - 2161. [Abstract] [Full Text] [PDF]

				K. E. Brickett, J. P. Dahiya, H. L. Classen, and S. Gomis Influence of Dietary Nutrient Density, Feed Form, and Lighting on Growth and Meat Yield of Broiler Chickens Poult. Sci., October 1, 2007; 86(10): 2172 - 2181. [Abstract] [Full Text] [PDF]

				B. S. Lumpkins, A. B. Batal, and D. H. Baker Variations in the Digestible Sulfur Amino Acid Requirement of Broiler Chickens Due to Sex, Growth Criteria, Rearing Environment, and Processing Yield Characteristics Poult. Sci., February 1, 2007; 86(2): 325 - 330. [Abstract] [Full Text] [PDF]

				R. A. Coleman, R. F. Bertolo, S. Moehn, M. A. Leslie, R. O. Ball, and D. R. Korver Lysine Requirements of Pre-lay Broiler Breeder Pullets: Determination by Indicator Amino Acid Oxidation J. Nutr., September 1, 2003; 133(9): 2826 - 2829. [Abstract] [Full Text] [PDF]