| abstract |
(57) [Summary] [Problem] An agent for regulating the spawning ability of birds, which can easily regulate the spawning ability of birds such as chickens, a feed for birds, a method of regulating the spawning ability of birds, and the spawning ability of birds such as chickens To provide a method for improving the spawning performance of birds, which can easily improve and improve the egg production. SOLUTION: An egg-laying regulator for birds or a feed for birds is made to contain melatonin, and the melatonin concentration in the birds is adjusted by using them to regulate the egg-laying ability of birds. |