An assembly for feeding and milking animals comprises a feeding system with a movable feed platform and a drive unit for driving the feed platform. The invention is characterised in that the active cutting part of the blade has, from the pointed tip and continuously, two conical sections such that, besides the pointed tip, each conical section has a greater taper ratio than the least distal part adjacent thereto. The covering is etched through for the shallower trench, leaving a protective covering in the deeper trench. In order to further reduce the size of face descriptor, variable length code can be used to encode the quantized eigenfeatures.