The purpose of this legislation is to update the regulation of zootechnical animal food substances under the Federal Food, Drug, and Cosmetic Act. The main objectives are to clearly define what constitutes a zootechnical animal food substance and to establish guidelines for their safe use in animal feed. Key provisions of the legislation include a new definition of zootechnical animal food substances, which are additives intended to affect digestion, reduce harmful pathogens, or influence the animal's body function without providing nutrition.