Abstract: Unitary spaces each having a floor defined by a perforated portion and a drive pulley for the cable portion of the loop. The loop is driven in reverse directions to move the belt portion between its floor forming position and an inverted position for cleaning. The belt portion carries a vertical rear end wall of the broiler quarters, disposed transversely of the belt. The side walls and the front end wall of the quarters are mounted on the frame. The belt portion extends round the guide roller to form a table section immediately to the outside of the front end wall position. To extract broilers from the battery, the front end wall is removed and the loop is driven so as gently to transport the broilers out onto the table section from which they are transferred onto a transverse conveyor almost at the same height. To install chicks, these are placed on the same table section, the loop being driven in the reverse direction so as to carry the chicks into the broiler quarters.