A grill member for use in a poultry feeder assembly has a generally curved rim member having an outward side surface which varies in radial distance relative to a center of the grill member and a top surface which varies in vertical height relative to a generally planar lower edge of the rim member without the need to adjust the grill member. The grill member also is configured to be rotated relative to a rotationally stable drop tube member in order to change both a position of a brood gate defined in the drop tube member relative to a base portion of a pan member and a height of a feed gate provided between a distal end of the drop tube member and the base portion of the pan member in order to control the flow of feed into the pan member through the brood gate and the feed gate.