Journal of Animal Science, Vol 75, Issue 6 1575-1583, Copyright © 1997 by American Society of Animal Science

JOURNAL ARTICLE

The effect of reducing excess dietary amino acids on growing-finishing pig performance: an elevation of the ideal protein concept

K. Tuitoek, L. G. Young, C. F. de Lange and B. J. Kerr
Department of Animal and Poultry Science, University of Guelph, ON, Canada.

Seventy-two gilts were used to determine the effect of reducing excess amino acid intake on growing-finishing pig performance. Separate diets were formulated for the growing (20 to 55 kg BW) and finishing (55 to 100 kg BW) periods. For each period, three diets were formulated that varied in total crude protein level and contained similar levels of digestible ideal protein. Crystalline amino acids were added to the low protein diets to overcome potential deficiencies. The grower diets contained .66% apparent ileal digestible lysine and contained 16.6, 15.0, and 13.0% CP, respectively; for the finisher diets, these values were .55% digestible lysine and 14.2, 12.8, and 11.0% CP, respectively. Amino acid analyses and a separate digestibility trial were conducted to confirm digestible amino acid levels in the dietary ingredients. During the growing and the overall growing-finishing period, daily gain, feed intake, and gain:feed were not affected (P > .10) by dietary treatment. Daily gain tended to be lower (P = .06) and gain:feed was poorer (P < .05) for pigs fed the 11.0% CP diet during the finishing phase. Although backfat thickness tended to be greater (P = .07) for pigs fed the lower-CP diet, estimated carcass lean yield was not affected (P > .10) by dietary treatment. Results of this study show that dietary CP can be reduced to 13% in the growing and 12.8% in the finishing diets of pigs as long as crystalline amino acids are added to match the apparent ileal digestible amino acid ratios in an assumed ideal protein.

This article has been cited by other articles:

				H. R. Martinez-Ramirez, E. A. Jeaurond, and C. F. M. de Lange Dynamics of body protein deposition and changes in body composition after sudden changes in amino acid intake: I. Barrows J Anim Sci, September 1, 2008; 86(9): 2156 - 2167. [Abstract] [Full Text] [PDF]

				C. Novak, H. M. Yakout, and S. E. Scheideler The Effect of Dietary Protein Level and Total Sulfur Amino Acid:Lysine Ratio on Egg Production Parameters and Egg Yield in Hy-Line W-98 Hens Poult. Sci., December 1, 2006; 85(12): 2195 - 2206. [Abstract] [Full Text] [PDF]

				B. J. Kerr, C. J. Ziemer, S. L. Trabue, J. D. Crouse, and T. B. Parkin Manure composition of swine as affected by dietary protein and cellulose concentrations J Anim Sci, June 1, 2006; 84(6): 1584 - 1592. [Abstract] [Full Text] [PDF]

				B. J. Kerr, L. L. Southern, T. D. Bidner, K. G. Friesen, and R. A. Easter Influence of dietary protein level, amino acid supplementation, and dietary energy levels on growing-finishing pig performance and carcass composition J Anim Sci, December 1, 2003; 81(12): 3075 - 3087. [Abstract] [Full Text] [PDF]

				B. J. Kerr, J. T. Yen, J. A. Nienaber, and R. A. Easter Influences of dietary protein level, amino acid supplementation and environmental temperature on performance, body composition, organ weights and total heat production of growing pigs J Anim Sci, August 1, 2003; 81(8): 1998 - 2007. [Abstract] [Full Text] [PDF]

				E. R. Otto, M. Yokoyama, P. K. Ku, N. K. Ames, and N. L. Trottier Nitrogen balance and ileal amino acid digestibility in growing pigs fed diets reduced in protein concentration J Anim Sci, July 1, 2003; 81(7): 1743 - 1753. [Abstract] [Full Text] [PDF]

				J. A. Shriver, S. D. Carter, A. L. Sutton, B. T. Richert, B. W. Senne, and L. A. Pettey Effects of adding fiber sources to reduced-crude protein, amino acid-supplemented diets on nitrogen excretion, growth performance, and carcass traits of finishing pigs J Anim Sci, February 1, 2003; 81(2): 492 - 502. [Abstract] [Full Text] [PDF]

				S. Zervas and R. T. Zijlstra Effects of dietary protein and oathull fiber on nitrogen excretion patterns and postprandial plasma urea profiles in grower pigs J Anim Sci, December 1, 2002; 80(12): 3238 - 3246. [Abstract] [Full Text] [PDF]

				J. L. Figueroa, A. J. Lewis, P. S. Miller, R. L. Fischer, R. S. Gomez, and R. M. Diedrichsen Nitrogen metabolism and growth performance of gilts fed standard corn-soybean meal diets or low-crude protein, amino acid-supplemented diets J Anim Sci, November 1, 2002; 80(11): 2911 - 2919. [Abstract] [Full Text] [PDF]

				C. P. A. Van de Ligt, M. D. Lindemann, and G. L. Cromwell Assessment of chromium tripicolinate supplementation and dietary protein level on growth, carcass, and blood criteria in growing pigs J Anim Sci, September 1, 2002; 80(9): 2412 - 2419. [Abstract] [Full Text] [PDF]