Abstract: An animal restraining device is described which is designed to restrain an animal in a pen to enable the animal to be artificially inseminated. The apparatus comprises an elongated pen having opposite sides and ends. One of the ends of the pen is open to permit the animal to enter the pen. The other end of the pen is selectively closed by a closure means designed to prevent the animal from leaving the pen when in its closed position and designed to permit the animal to leave the pen when in its open position. The restraining apparatus comprises a bar support which is selectively longitudinally movable at one side of the pen. A restraining bar is selectively pivotally mounted on the bar support and is pivotal from a position generally parallel to the side of the pen to a tranversely extending position towards the other side of the pen. After the animal is driven into the pen, the bar is pivotally moved to its operative position.