To solve such problems that, since a stroke of reciprocation has its limitations in a discharge apparatus of one-sided operation type, the lengths of paddles is limited in need of surely opening and closing paddles, an amount discharged can not be increased without widening the width of a discharge pit, and in reciprocation, the underside of a slider shaves off the bottom of concrete, repair of the bottom is frequently required and an increase in cost for the repair is unavoidable.

A slider 35 reciprocating at a fixed stroke is installed on a guide rail 36 laid on the bottom of a discharge pit 20 of a cattle shed 13. A transporting rail 22 supported and fixed to the slider 35 is equipped with openable and closable paddles 38/45 at both right and left sides. Further, a sliding face is arranged between the slider 35 and the guide rail 36.