Mastitis in dairy herds is a worldwide problem, with significant implications for milk yields and quality, economic losses and animal health and welfare. Effective control makes a considerable difference to the farmer and the animal, and this new edition includes updated information throughout, as well as new chapters, covering organic dairy herds, dry period infections, robotic milking, residue avoidance and best practice procedures. The authors provide basic principles relevant to farmers, veterinarians and veterinary students in a clear and practical way, covering anatomy, epidemiology, milking machines, disinfection, somatic cell counts and diseases of the udders and teats in order to provide a thorough understanding of the causes of mastitis and measures of control and prevention.