In general, 20-pound Maine Coon cats should be fed 2-3 cups of dry food every day. This is the recommended Maine Coon feeding rule in https://www.21cats.org/maine-coon-feeding/. The best approach to Maine Coon feeding is to avoid giving it too much food. Although food companies list recommended daily values for Maine Coon feeding, these values are only guidelines for Maine Coon feeding and not absolute. Maine Coons are highly active cats with fast metabolisms; thus, Maine Coon feeding needs to be taken special care of. To increase Maine Coon feeding, the food must be of higher quality and have a higher amount of protein.