Abstract: ABSTRACT OF THE DISCLOSURE: An object of the present invention is to provide a silent chain drive device that can minimize loss of strength and wear of link plates, as well as prevent the chain from lifting up to achieve better power transmission efficiency. The silent chain drive device includes a silent chain designed for inside flank meshing/inside flank seating, and a sprocket with sprocket teeth. The plurality of link plates in the silent chain, which each have a pair of teeth, are configured to make contact with the sprocket teeth only at the inside flanks of each pair of teeth when the silent chain wraps around the sprocket and meshes with all of the sprocket teeth.

Abstract: A method for producing poultry for raising poultry with high production score is provided. In a method for producing poultry in a poultry house, a feeding area for feeding the poultry is illuminated with blue light in an early raising period of a poultry raising period. In the early raising period, behavior of chicks can be restricted by illuminating the feeding area with blue light. Accordingly, sudden death of chick or metabolic disorder due to excessive and abrupt behavior of chick can be prevented, and thus chicks not having injury or diseases such as metabolic disorder can be raised, and physical conditions of the grown poultry can be improved.