[Investigations of the metabolism of colostomised laying hens with 15N-labelled wheat. 5. Incorporation and distribution of 15N in the contents of the intestinal tract, the tissue of stomachs and the segments of the intestines].

In an experiement with 3 colostomised laying hybrids each animal received 80 g pelleted mixed feed and 40 g 15N-labelled wheat with 20.13 atom-% 15N-excess (15N') over a period of four days. On the following four days the hens received rations composed in the same way with uulabelled wheat, however. Of the individual tissues and organs extracted from the slaughtered hens 15N' was determined in the total N and the amino acids lysine, histidine and arginine in the individual segments both of the gasto-intestinal tract and in its contents. On a average, the amount of 15N' in the stomachs, the small intestines and the colon was 43.7%, 27.2% and 29.1%. The tissue of the small intestines contained, on an average, the highest 15N' in lysine of all the basic amino acids. It amounts to 0.82 atom-% 15N' for lysine, O.55% for histidine and 0.63 atom-% 15N' for arginine. On an average, the percentage of the 15N' of the basic amino acids from the corresponding total 15N'-amount of the charges is in the contents of the gasto-intestinal tract 20.5%, in the stomach tissue 28.0% and in the tissue of the small intestines 24.4%, of the caecum 21.5% and of the rectum 25.7%.