Kovács I. Endre szerk.: Rovartani Közlemények (Folia Entomologica Hungarica 10/1-12. Budapest, 1957)

melynek során 45.0- 66.0 i> protein, 73- 75 i> zsir és 63-69 f> N-mentes kivonható anyagkihasználást tapasztaltunk. A vizes levél etetése esetén a protein és rostkihasználás lényegesen kedvezőbb volt. Az emésztésre rövid idő áll rendelkezésre, mert a takarmány 78 #-a 6 óra alatt kiürül a szervezetből. Observations on the use of Food by the Silkworm (Bombyx mori L.) by prof. Dr. H. Tangl and Dr. L. Machay (Department of Animal Physiology and Nutrition of the Research institute for Animal Husbandry, Budapest) Authors made observations on 3rd and 4th instar larvae of the silkworm in order to complete the partly controversial data found in literature concerning the use of food by this animal. Leaves of Morus alba L. were fed in natural state as well as moistened with water and hydrochloric acid and pepsin solution in water respectively. The leaves consumed and the excrements were accurately weighed and after protein, fat, fibre and N-free extract content of these materials were established a conclusion was drawn as to the extent of the use of food. Leaves were fed further where the vascular system was coloured with Liamant-fuchsin and by means of microscopic observation of the excrements the time of detention of the food in the gut of the silkworm was established. The silkworm utilized chiefly the fat content of the mulberry-tree leaves, i.e. 73.3 per cent. N-free extracts were used in large quantities /63 per cent/ too. The utilization of protein and fibre,on the other hand, was only 44.6 and 2.7 per cent respectively. By moistening the leaves with water the protein and fibre utilization could be raised.