Why to know Physiology?

We must know that what's going on inside a dairy cattle to detect  abnormal state of health. When the state of health is spill then it's important for a dairy scientists to understand the situation although it's duty of veterinarian to diagnose it. Just like we should know about machinery structure to drive it. Although anyone can drive a machinery but a technician who understands it can manage it better. Other example is that if we know our internal systems that we can manage our health and maintain fitness more efficiently.
General knowledge about dairy cattle helps us to understand them.