Milk is one of the world's most important agricultural food products. Its importance in the diet is widely acknowledged and it is an essential ingredient in a wide range of foods. In meeting rising demand, more intensive dairying systems face a range of challenges such as maintaining high standards of safety in the face of the continuing threat from zoonoses entering the food chain, whilst sustaining nutritional and sensory quality. At the same time farms need to become more efficient and sustainable. Finally, farming must also meet higher standards of animal health and welfare....