Animal keeping installation comprising a floor (11) provided with a mat (12) on which the animal treads when setting foot on the floor (11) and which mat (12) is arranged to be intermittently propelled by a drive roll (13) placed internally in relation to the mat (12), wherein the drive roll (13) is connected to and mounted in bearing journals (15) for rotation about its center axis in a pendulum (14) which allows the drive roll (13), on the one hand, to bear against the inner side of the mat (12) and, on the other hand, to be released from the said bearing contact in dependence on the position of the pendulum (14), and wherein the drive roll (13) is connected to a drive member (18, 19, 51, 62) for driving the roll (13) at least into a position where the drive roll (13) bears against the mat (12).