An accuracy of the sex determination which is visually inspected by human based on a reference drawing of an egg shape prepared for every parent chicken is insufficient and it takes much time to perform such a determination. A lateral port passes through the body from the bore to the exterior surface. A panel is disposed on or around the flexible rod and between the base and guide members. The coated substrate can be used as prepared or applied to yet other substrates. When the shared memory block is used not as a cache memory but for another use, the shared memory block is prevented from being used as a cache memory by re-linking all the cache pages belonging to the shared memory block from an LRU link to such unavailable links individually. An LED or an LED array of a base color with a beam path oriented in the direction of the display unit is arranged on the optical axis of the illumination module.