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1. A feeding dispenser for poultry breeding, comprising a cylindrical feed supply conduit, an accumulation tray to supply the feed to poultry, wherein the accumulation tray has a circular shape and comprises a bottom wall and a side wall, and an outer sliding shutter rotatable with respect to said supply conduit and slidingly movable in vertical direction between an upper positioning height and a lower positioning height to regulate the feed level in said accumulation tray, wherein the shutter comprises a cylindrical portion and a truncated-cone shaped portion with the opening of the cone facing the accumulation tray, wherein the cylindrical portion of said shutter and said cylindrical supply conduit are coupled and free to slide between one another through a protuberance engaged in a groove, wherein the groove is configured and shaped as an inverted hook having two straight vertical branches which are parallel to the axis of the feeding dispenser, wherein a bump is provided in one of said two straight vertical branches to provide an upper bearing seat for said protuberance and define a relevant upper positioning height of the shutter, wherein said bump can be surmounted by said protuberance by elastic deformation of part of said cylindrical supply conduit and/or part of said cylindrical portion of the shutter following an upward or downward thrust exerted on said shutter with force sufficient to exceed the elastic reaction of part of said cylindrical supply conduit and/or part of said cylindrical portion of the shutter, so as to move said shutter between said upper positioning height, a lower bearing seat for said protuberance being provided at the end of said one of said two branches provided with said bump in order to define said lower positioning height for said shutter.
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