I saw this thread a little late, but thought I'd contribute my experience also. My bucks are immediately next door to my does in milk--I mean kissing through the fence close. I only noticed a little bit of increased goaty-ness in the milk when the does were actually being bred, so maybe for a week total, across the girls' breeding period. I have never noticed any off flavor due to what they ate, and I've fed them lots of different veggies I've grown for them, including Brassicas (cabbage, broccoli, turnips, etc), as well as browse (branches from different trees and shrubs). Both those observations fly in the face of the 'common knowledge'.