How do brown cows eat green grass and give white milk ?
The reason why brown cows eat green grass and give white milk is because of the biological process involved in making milk. In addition, the color of the cow does not in any way affect the milk making process.
They are still cows! How do women eat different foods but still give white milk? Same type of question.
Why is pee usually clearish yellow? (if you're healthy). And sometimes cows give yellow milk, if they eat onions.
The chemical reaction that changes the cow's food to milk causes the color change.