QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed 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 Velu, J. G. Articles by Scott, H. M. Search for Related Content PubMed PubMed Citation Articles by Velu, J. G. Articles by Scott, H. M.

Protein and Energy Utilization by Chicks Fed Graded Levels of a Balanced Mixture of Crystalline Amino Acids

Department of Animal Science, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801

Graded levels of a balanced amino acid mixture from zero to 30.85% of the diet were fed to chicks from day 8 to day 21 posthatching to evaluate performance, body composition and protein (N x 6.25) as well as energy utilization. Body and liver composition changed markedly in response to changes in the dietary calorie/protein ratio. Percentage body fat increased and percentage body protein decreased as the concentration of dietary amino acids was increased from zero to 11.57% of the diet. However, dietary amino acid increments between 11.57% and 30.85% resulted in a precipitous decrease in percentage body fat and an inverse rise in percentage body protein and water. Liver fat reached a maximum at a low level of protein intake, then steadily declined. Throughout a dietary range of zero to 23.14% of the amino acid mixture, body protein retention, weight gain and liver protein increased linearly when evaluated as a function of protein intake. Energy utilization was found to be constant at all levels of metabolizable energy consumed. Our results support the conclusion of Hegsted and Neff that protein utilization is constant throughout a wide range of protein intake up to the point of maximal protein retention and weight gain.

Manuscript received 10 February 1971.

This article has been cited by other articles:

				J. McNaughton, M. Roberts, B. Smith, D. Rice, M. Hinds, C. Sanders, R. Layton, I. Lamb, and B. Delaney Comparison of Broiler Performance When Fed Diets Containing Event DP-3O5423-1, Nontransgenic Near-Isoline Control, or Commercial Reference Soybean Meal, Hulls, and Oil Poult. Sci., December 1, 2008; 87(12): 2549 - 2561. [Abstract] [Full Text] [PDF]

				J. McNaughton, M. Roberts, B. Smith, D. Rice, M. Hinds, T. Rood, R. Layton, I. Lamb, and B. Delaney Comparison of Broiler Performance and Carcass Yields When Fed Diets Containing Transgenic Maize Grains from Event DP-O9814O-6 (Optimum GAT), Near-Isogenic Control Maize Grain, or Commercial Reference Maize Grains Poult. Sci., December 1, 2008; 87(12): 2562 - 2572. [Abstract] [Full Text] [PDF]

				J. McNaughton, M. Roberts, B. Smith, D. Rice, M. Hinds, J. Schmidt, M. Locke, K. Brink, A. Bryant, T. Rood, et al. Comparison of Broiler Performance When Fed Diets Containing Event DP-356O43 5 (Optimum GAT), Nontransgenic Near-Isoline Control, or Commercial Reference Soybean Meal, Hulls, and Oil Poult. Sci., December 1, 2007; 86(12): 2569 - 2581. [Abstract] [Full Text] [PDF]

				P. W. Plumstead, H. Romero-Sanchez, N. D. Paton, J. W. Spears, and J. Brake Effects of Dietary Metabolizable Energy and Protein on Early Growth Responses of Broilers to Dietary Lysine Poult. Sci., December 1, 2007; 86(12): 2639 - 2648. [Abstract] [Full Text] [PDF]

				Samadi and F. Liebert Estimation of Nitrogen Maintenance Requirements and Potential for Nitrogen Deposition in Fast-Growing Chickens Depending on Age and Sex Poult. Sci., August 1, 2006; 85(8): 1421 - 1429. [Abstract] [Full Text] [PDF]