Feed additives are non-nutritive substances, preparations and micro-organisms that are added to feed to animal feeds to improve growth performance, feed intake and the efficiency of feed utilization for healthy, economic and eco-friendly livestock production. This book on Advances in Animal Feed Additives addresses current information on the use of different animal feed additives with regard to production, health and reproduction of livestock and poultry. This book contains twenty five s contributed by 30 eminent scientists of animal nutrition, which highlights the significance of antioxidants, enzymes, probiotics, prebiotics, synbiotics, antimicrobials, organic acids, coccidiostats, mycotoxin binders, immunomodulator, hen egg antibody, hormones, beta agonist, methane inhibitors, defaunating agents, essential oil and herbal feed additives. etc. for sustainable livestock and poultry production. Each of the book attempts at providing clear and updated information on feed additives supported with good amount of the experimental evidence and references which will enable the students and research workers to obtain information quickly when necessary. The book is useful to students of animal sciences, teachers and scientists of animal nutrition discipline, personnel of feed industry, field veterinarians, animal husbandry extension workers and progressive animal farmers.