The manual details the physiology of the mammary gland and the lactation process, the etiology and causes of mastitis, the classification and forms of mastitis manifestations, reflects the latest achievements of science and practice in the field of diagnostic methods, principles and schemes of prevention and treatment. The 2nd edition of the book is supplemented with up-to-date information on the diagnosis, prevention and treatment of mastitis, but its main difference from the previous edition is the chapters “Selection genetic methods of mastitis control” (art.) Kudinov A . A. , Tribes K. In. ) and "Organization of the control system of antimicrobials (SCAMP) in dairy farming" (art. Shchepetkina S . In. ). Each section is accompanied by author's photos and practical recommendations. The book “Mastitis: etiology, prevention, diagnosis, treatment” is an up-to-date practical guide for managers of livestock complexes, specialists in veterinary medicine and zootechnics . The textbook will find a wide response not only among students of agricultural and veterinary universities, but also among veterinary specialists and will help to replenish knowledge in the field of the latest achievements of veterinary medicine. All of the above makes the book an interesting and important practical guide for students and specialists of enterprises in veterinary medicine, zootechnics, agronomy, working in the direction of improving the conservation of livestock and creating highly productive dairy herds.