A concise review of the fundamentals of immunology in a readily understandable manner for the field veterinary practitioners is presented in this small product. The crisp material with key points give readers the significance of immunity in Livestock and other domestic animals for better health, early recovery from infections and resistance to fight ailments. How and which nutrients play a Big role in initiating the immune system to function optimally and persistently. In another segment dealt in immune response, immunogenicity the mechanism and factors to stimulate immune system are given in a very crisp description. The objective is to know the significance of this X factor for the welfare of animals and benefits of animal owner as well as their income in dairy business. The emphasis is in its clinical relevance with stress on need to supplement those nutrients act as Immuno-modulators. Contents: Preface 1. Immunity - Immunogenecity 2. Immunity in Crisis Why ? 3. How Strong is Immune System of an Animal 4. Impact of Immune System on Good Health 5. Why to Boost Immune System of Animal 6. Infections Causes and Consequences 7. Immune System Immune Response 8. How Immune System works ? 9. Immune Army of Animal 10. Immunity Types, Autoimmunity 11. Antibodies Antibiotics 12. Nutrition and Immune Function 13. Nutrition Support Immunity 14. Immune Boosting Diet 15. Immune Boosters Other Factors 16. Vaccination for Immunity 17. Immunisation Annexures Innate Immune System. Immune Cells. Recommended Feeding Levels of Nutrients per day Large Animal Weighing 300-400 kg. Formulations to Boost Immunity. Essential Amino Acids. Factors Contributing to Non-Specific Immunity. Glossary. References. Index.