Well well, never thought i'd see an article like this, in days before they'd at the milk boards in ontario would frown upon off tasting milk, infact it could be refused, results of milk boards is that all milk in comingled, all brreds... thats collectivization for you, all milk was treated like tjis, but yes different flora in pastures will impact flavor on the milk, some desirable some not. But in the guise of artisanal cheese or butter can be to your adavantage as imparting a identifier of your product..like wine...etc, etc... wild carrot, wild hops, butter cups, blac eyed susans, all forms of unusual growth. A cow will graze from around 10 am till about 3pm, times when charbohydrate highest in plants, hence why you'd cut hay at that time of day, at night not very good, low chardsbs in the hay, aslo this time of day low moisture. Cows will eat what is tender & palatable to them, if somthing upsets their stomache they will avoid it.. Ted to see this amongst Jerseys, canadienne, short horn, beef breeds,