Abstract: The present invention is related to a device in animal feeding apparatuses comprising dosage containers having foldable bascules or scuttles, which are adjustable and fixable at different heights in the containers for the purpose of changing the volume of the containers, wherein an operating means striving always to hold the scuttle in a closing position is associated to and actuatable by a loop of a cord or band member or the like extending within the container, one end of said band member being applied to an attachment situated at or near the lower part of the container and the other end thereof being connected to a release mechanism, which may be common to a plurality of dosage containers, whereby a pulling force transmitted from the release mechanism to the band member causes independently of the height adjustment of the scuttle, a decrease of the size of the loop, which in turn causes the operating means to be moved away and the scuttle to be opened.