On my vacation I drove from Washington state to Arizona, and I noticed something that I hadn't seen (or maybe hadn't noticed before: The desert dairy.
The cows appeared to be being fed grass and alfalfa hay. I couldn't tell if they were getting some sort of prepared feed in addition. This is a little different view than you'd get if you looked at the milk carton. Usually they show a happy cow on grass, with a barn in the distance.
4 weeks ago