Some Moscow-based farmers tried virtual-reality headsets on their cows. They wanted to test if it improved cows' mood, and hence milk production. It did reduce cows' anxiety, signaling a success. In the 2nd phase, the quality and quantity of the milk produced by VR-wearing cows will be ascertained.
The white colour of milk depends upon its material composition. Its reason composition is such that it reflects all the wavelengths of light and absorbs none.