A feeding trough for poultry farming includes automatic dispensing of feed from a vertically displaceable horizontal dispensing tube, formed by just three pieces. One of the pieces is a plate formed in one piece with a ring which in a lowered position of the bell-like housing opens a crown of apertures and in a raised position of the bell-like housing closes the crown of apertures so as to reduce the amount of feed transferred to the plate. The feed trough is also configured to facilitate periodic rinsing thereof.