The use of the mobile bag technique in swine. 2. Determination of the apparent and true crude protein digestibility of 15N-labeled feed] |
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| Authors: | R Schadereit K Krawielitzki J Wünsche W B Souffrant E Borgmann |
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| Institution: | Forschungsinstitut für die Biologie landwirtschaftlicher Nutztiere, Rostock, Germany. |
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| Abstract: | In a series of experiments in two ileo-rectostomized pigs the precaecal apparent and true digestibilities for crude protein of seven 15N-labelled feedstuffs were studied using the mobile bag technique. True digestibility values of crude protein calculated with the help of isotope dilution were 4-14 units higher than the corresponding apparent digestibility values. This is caused by the infiltration of the bag residues with endogenous unlabelled nitrogen. In dependence on the kind of feedstuff the endogenous N portion in the bags amounted to 25-70% of the total N. In addition, the contamination is influenced by differences between the animals (mean 4-7%) and by different treatments of bags after gut passage (3-10%). |
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