Journal of Animal Science, Vol 76, Issue 2 569-577, Copyright © 1998 by American Society of Animal Science

JOURNAL ARTICLE

Nitrogen utilization in pigs fed diets with soybean and rapeseed products leading to different ileal endogenous nitrogen losses

W. Grala, M. W. Verstegen, A. J. Jansman, J. Huisman and J. Wasilewko
Wageningen Agricultural University, Wageningen Institute of Animal Sciences, Animal Nutrition Group, The Netherlands. witek.grala@alg.vv.wau.nl

Nitrogen (N) balance was determined in 36 pigs (BW 24 to 30 kg) fed diets inducing different ileal endogenous N losses (ENL). We tested the hypothesis that enhanced ENL may be indicative of a higher recycling of endogenous proteins that will induce a greater urinary N loss and a lower efficiency of the dietary N utilization for retention. The cornstarch-based diets contained either soy concentrate (SC), soybean meal (SBM), a mixture of toasted and untoasted soybean meal (mSBM), dehulled-toasted rapeseed cake (RC1), non-dehulled-toasted rapeseed cake (RC2), or dehulled-untoasted rapeseed cake (RC3). The diets were balanced for their content of apparent ileal digestible (ID) CP (108 g/kg feed) and apparent ID of Lys, Thr, Met+Cys, Trp, and Ile. Feeding level was 2.7 times ME for maintenance per kilogram BWx75 and restricted to 88% of the requirements for ID Lys as the first-limiting amino acid. During a 5-d period, urine and feces were collected daily in metabolism cages. Compared with the SC diet (low ENL), the diets with SBM (medium ENL) and mSBM (high ENL) resulted in a greater (P < .05) urinary N excretion. Nitrogen retention tended to be less (P = .08) in pigs fed diets that caused greater ENL. The utilization of ID N for retention in pigs fed the mSBM diet was lower (P < .05) than for those fed the SC diet. There were no differences in urinary N excretion, N retention, and the utilization of ID N for retention in pigs fed the rapeseed diets of different fiber contents (hulls as the NDF source). We concluded that, at similar intakes of the first-limiting ID amino acid, N retention in pigs fed soybeans tended to be reduced by greater ENL as induced by antinutritional factors (e.g., trypsin inhibitors). Rapeseed hulls, as the predominant fiber source, do not affect N retention and the utilization of ID N for retention.

This article has been cited by other articles:

				C. Bos, G. Airinei, F. Mariotti, R. Benamouzig, S. Berot, J. Evrard, E. Fenart, D. Tome, and C. Gaudichon The Poor Digestibility of Rapeseed Protein Is Balanced by Its Very High Metabolic Utilization in Humans J. Nutr., March 1, 2007; 137(3): 594 - 600. [Abstract] [Full Text] [PDF]

				C. L. Zhu, M. Rademacher, and C. F. M. de Lange Increasing dietary pectin level reduces utilization of digestible threonine intake, but not lysine intake, for body protein deposition in growing pigs J Anim Sci, May 1, 2005; 83(5): 1044 - 1053. [Abstract] [Full Text] [PDF]

				R. N. Dilger, J. S. Sands, D. Ragland, and O. Adeola Digestibility of nitrogen and amino acids in soybean meal with added soyhulls J Anim Sci, March 1, 2004; 82(3): 715 - 724. [Abstract] [Full Text] [PDF]

				F. Mariotti, M. E Pueyo, D. Tomé, S. Bérot, R. Benamouzig, and S. Mahé The Influence of the Albumin Fraction on the Bioavailability and Postprandial Utilization of Pea Protein Given Selectively to Humans J. Nutr., June 1, 2001; 131(6): 1706 - 1713. [Abstract] [Full Text]

				F. Mariotti, S. Mahé, R. Benamouzig, C. Luengo, S. Daré, C. Gaudichon, and D. Tomé Nutritional Value of [15N]-Soy Protein Isolate Assessed from Ileal Digestibility and Postprandial Protein Utilization in Humans J. Nutr., November 1, 1999; 129(11): 1992 - 1997. [Abstract] [Full Text]