Systems and methods for suspending game animals. Whether or not each register line has defect is examined by detecting an output of a last register of each register line, then the register line having defect is detected by the examination, a normal register line is selected by a shift register selecting switch, and the serial-connected registers of the selected register line are used in the shift register circuit. According to the invention, the pressurizing means is in the form of a spring, such as a coil spring, the first end of which is connected to the compression plate and the second end of which is operatively connected to a handle, which can be operated to adjusting the compression of the spring.