Excitement before insemination depresses secretion of hormones that stimulate contractions of the reproductive tract that move sperm to the site of ovum fertilization. Use a dark box to hold cows. You can hold the wildest cow with minimum distress. There is evidence that stress due to rough handling can affect cattle's immune response - they are more susceptible to disease. Vision Cattle have excellent wide angle vision, in excess of 300 degrees, due to the position of their eyes.
Cattle can see behind themselves without turning their heads.
Ruminants do have depth perception, but they have difficulty perceiving depth at ground level while they are moving with their heads raised. To see depth at the ground, the cow has to lower its head, perhaps explaining why cattle balk at shadows or distractions at ground level. The flight zone is the animal's personal space. If you move inside the flight zone, the animal will move away. When you back off, the animal will stop moving.