The present invention concerns an apparatus for stimulation of an animal for preparing and performing artificial insemination, the apparatus adapted for placing on a back part of the animal and provided with a holder for a container with semen and associated catheter, where the apparatus includes a frame (1), a number of rocker arms (4), at least one displacing unit (3), a number of pressing pads (2) and at least one valve arrangement (7), where the rocker arms (4) are connected to the displacing unit (3) and to the frame (1), where each of the rocker arms (4) are connected to the frame (1) and provided with at least one of the pressing pads (2), and where the valve arrangement (7) is adapted to control the displacing unit (3) for establishing a pulsating action on the animal with the pressing pads (2).