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

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Author: Grala, W. · Verstegen, M.W.A. · Jansman, A.J.M. · Huisman, J. · Wasilewko, J.
Institution: Centraal Instituut voor Voedingsonderzoek TNO
Source:Journal of Animal Science, 2, 76, 569-577
Identifier: 55300
Keywords: Nutrition · Nitrogen Balance · Pigs · Rapeseed · Soybeans · Amino acid · Lysine · Nitrogen · Animal · Animal food · Brassica · Comparative study · Diet · Digestion · Feces · Ileum · Male · Metabolism · Orchiectomy · Physiology · Soybean · Swine · Amino Acids · Animal Feed · Animals · Brassica · Diet · Digestion · Feces · Ileum · Lysine · Male · Nitrogen · Orchiectomy · Soybeans · Swine


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 corn-starch-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 BW·75 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 END, the diets with SBM (medium ENL) and mSBM (high END 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.