The effect of different technical treatments of rapeseed on its feed value for broilers and laying hens was the object of the study. The technical treatments comprised different grinding procedures (whole seed, roller mill--coarse and fine adjustment, flake mill) resulting in different average particle sizes of the ground seed and thermal treatments of flaked seed (hydrothermal treatment, micronizer, jet sploder). Each thermal treatment was carried out at two temperatures. A marked increase in the digestibility of organic matter and of the AMEN content was observed as the average particle size of the seed was decreased to < or = 0.56 mm and was much more pronounced for the broilers. AMEN contents of 21.1 to 22 and 22.6 to 23 MJ/kg DM were observed at this particle sizes for broilers and hens, respectively. Thermal treatment of rapeseed improved the apparent crude fat digestibility slightly whereas the apparent crude protein digestibility tended to decrease especially at the higher temperatures. This resulted in inconsistent changes in the apparent digestibility of the organic matter and the AMEN content. Only the treatment with hot air (jet sploder) seemed to have preferential effects on the feed value for both broilers and hens. For the thermal treatments AMEN contents ranged from 18.8 to 21.9 and 19.0 to 24.3 MJ/Kg DM for broilers and hens, respectively.

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Zusammenfassung 1961 folgte eine Wiederholung des Befalls von 1959 in einem Roteichen‐jungbestand, bevorzugt befallen wurden spätaustreibende Jungeichen, meist stärkere Stämmchen. 1962 gab es nur schwachen Stockbefall in der Nähe der Roteichen, eingeengt durch ungünstiges Wetter. 1963 wurde eine größere Fläche mit frischem Einschlag von Altbuchen stärker angeflogen. Die ökologischen Bedingungen waren genügend breit variiert, und es wurde festgestellt, daß der direkte Anflug von dem Grad der Beschattung und dem Gesundheitszustand des Stockes abhängt. Bevorzugt wird für den Anflug der kürzeste Weg, aber auch Entfernungen über 200–300 m werden mit entsprechender Verzögerung überwunden. Im Stock selbst wird das gesunde und feuchte Holz bevorzugt, Bedingungen entsprechend, die einem pilzzüchtenden Käfer gestellt sind. Xyleborinus saxeseni ist allgemein später und in wenigen Exemplaren 1963 erschienen. Wenn Gefahr für entsprechend disponierte Laubholzjungkulturen manmangels frischer Stöcke besteht, muß eine rechtzeitige Stockbegiftung kurz vor Ausflug durchgeführt werden. Stehende Altbäume (Eiche, Buche, Birke) geschnittene, liegende Stämme und Wipfelholz, Äste (am Windbruch kontrolliert) ließen keinen Befall erkennen. Summary In 1961 an attack recurred in a stand of young red oak trees which was already noticed in 1959. Particularly late‐sprouting young trees were infested, in most cases thicker young stems. In 1962 there was only a slight attack to stumps in the vicinity of red oaks due to unfavourable weather conditions. In 1963 a larger area with newly‐felled old oaks became strongly infested. The ecological conditions varied broadly, and it was found that the direct flight depends on the degree of shading and the physical conditions of the stump. For the flight to the host the shortest way is preferred but even distances of 200–300 m can be overcome, although not without delay. In the stump preference is given to the healthy and moist wood, in accordance with the conditions given to a fungus growing beetle. In 1963 Xyleborinus saxeseni generally appeared later and with a few individuals only. If danger exists for a predisposed stand of young deciduous trees due to lack of fresh stumps chemical treatment of the stumps is to be recommended before the flight begins.

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