Title
Nitrogen utilization in pigs fed diets with soybean and rapeseed products leading to different ileal endogenous nitrogen losses
Author
Grala, W.
Verstegen, M.W.A.
Jansman, A.J.M.
Huisman, J.
Wasilewko, J.
Centraal Instituut voor Voedingsonderzoek TNO
Publication year
1998
Abstract
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.
Subject
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
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TNO identifier
55300
ISSN
0021-8812
Source
Journal of Animal Science, 76 (2), 569-577
Document type
article