Part I. Introductory Chapters and Historical Abstract -- Feed Additives to Ensure Sustainability -- Feed Additives, Their Role and Technological Properties -- Food Additives as Functional Ingredients in Food Products -- History of Feed Additives -- Part II. Sources and Types of Feed Additives -- Enzymes as Feed Additives -- Medicinal and Aromatic Plants as a Source of Potential Feed and Food Additives -- The Role of Insects in Novel Sustainable Animal Production Systems -- Probiotics, Prebiotics, Paraprobiotics, Postbiotics -- Novel Plant Extracts as Food Additives -- The Use of Feed and Food Additives in USA -- Part III: Biochemistry and General Effects -- The Effects of Feed Additives on Farm Animals under Heat Stress Conditions -- Feed Additives as Antiviral Agents -- Food and Feed Additives to Counteract Mycotoxin Toxicity in Human and Animals -- Part IV. Specific Applications in Livestock by Animal Groups -- Plant-Based Feed Additives for Livestockand Poultry in Southern Africa -- Plant-Based Feed Additives for Livestock and Poultry in Southern Africa -- Feed Additives to Combat Intestinal Diseases in Antibiotic Free Poultry Farming -- The Effects of Feed Additives on the Immune System of Poultry -- Application of Aromatic Plants and Their Extracts in Livestock -- Improving the Sustainability of Laying Hen Production Using Plant-Based Feed Additives -- Application of Feed Additives in the Diets of Turkeys -- Effect of Phytochemical Feed Additives on Health Status, Milk Yield and Quality Characteristics in Ruminants -- Feed Additives as Dietary Tools to Improve Welfare Status in Ruminants -- Application of Feed Additives to Improve Pork Meat Quality -- Feed additives, as Dietary Tools to Support Gut Health of Pigs -- Feed Additives as Immune Boosting Factors in Swine Health -- Probiotics as Feed Additives in Monogastric Animals -- Feed Additives for Insect Production -- Feed Additives in Aquaculture -- Certain Major Diseases Having Nutritional Disorders in Their Etiology and Economic Importance in Horses -- Feed Additives in Rabbit Nutrition to Ensure Sustainability -- Part V: Analytical Methods, Future Outlook and Perspectives -- Modern Applications in the Determination of Food and Feed Additives -- Antimicrobials as Feed and Food Additives, Their Technological Properties and Perspectives -- Feed Additives and Future Perspectives.