Abstract: A method of treating an animal which does not naturally produce sufficient quantities of testosterone includes periodically administering a testosterone to the animal. The method includes conducting an initial examination of the animal; determining a testosterone level of the animal; administering a testosterone to the animal; determining the testosterone level of the animal to which the testosterone has been administered; and periodically administering the testosterone to the animal and monitoring the testosterone level, based on the detected testosterone levels and clinical signs.

Abstract: A hand-guided drilling machine or percussion drilling machine has a machine housing, a drilling spindle, a drive motor for rotatably driving the drilling spindle, a tool holderformed as a drilling chuck and screwed with the drilling spindle through a thread, the drilling spindle during exchanging a tool or exchanging the tool holder receiving a releasing or tightening moment, an arresting device non-rotatably coupling the drilling spindle relative to the machine housing, an intermediate shaft non-rotatably connected with the drilling spindle, a component connected with the machine housing, the arresting device being arranged between one element selected from the group consisting of the drilling spindle and the intermediate shaft and another element selected from the group consisting of the machine housing and the component, the arresting device automatically opening during a torque transmission from the drive motor to the tool and automatically closing during the torque transmission from the tool holder in an