The taste sensing system has also been examined for use in the selection of feed appropriate for the growth of local chickens with the aim of reducing the breeding cost . The feed in the reference shows greater responses to umami and koku than other types of feed. Here, koku is also called kokumi in academic fields and is generally known as rich taste, thick taste, or good body. Kokumi, or koku, substances were discovered by Ueda et al. and its receptor has also been discovered recently [61]. Koku substances add thickness, mouthfulness, and continuity to the taste of foods. A typical koku substance is glutathione (γ-L-glutamyl-Lcysteinylglycine). The taste sensing system can be used to quantify koku by measuring the CPA value for umami. In actuality, the effect of kokumi flavor in noodle soup base has been demonstrated and quantified using the taste sensing system.