A feed additive for laying hens comprising lactobionic acid or a lactobionic acid salt and a feed characterized by containing a feed additive for laying hens comprising lactobionic acid or a lactobionic acid salt and a feed. Various construction details and steps of the method are developed which promote, in one embodiment, automating the method of performing the processes and cleaning the articles between electrochemical processes. A light-transmitting insulating film is formed on side surface and bottom surface of the groove. In some embodiments with a partitioned interior volume, the tamper-evident feature comprises a peel seal. A write data wordline opposes the first vertical transfer device. The asynchronous operation uses two different discharge circuits in two different time sequences to reduce the probability of occurring discharge at the same spot and effectively reduce pause time, and prevent the cutting wire from rupturing, thereby to reduce production cost and improve operation efficiency.