Prompt and correct diagnosis of livestock and poultry diseases has paramount importance in veterinary and animal husbandry practices. It facilitates timely initiation of safe and specific therapy and implementation of preventive and control measures against diseases. The success of diseases surveillance programmes also depends on the availability of diagnostic tools and facilities. This book presents a detailed and comprehensive account of conventional and modern techniques for diagnosis of major diseases of animals and poultry. Distinguished scientists and academicians across the country having expertise in disease diagnosis have contributed chapters in the book. Diagnostic techniques in pathology, microbiology, molecular biology, immunology, parasitology, cytology, haematology and imaging have been vividly described and suitably supported with impressive illustrations. The book is an unmatched reference resource not only for the disease diagnosticians but also for the researchers and teachers. Simple language of the book makes it equally useful for the undergraduate and postgraduate students of veterinary sciences and animal husbandry disciplines.