I hope you realize that according to your description, there are very few of those "most efficient" dairies. For best milk production, the cows need to be kept

I hope you realize that according to your description, there are very few of those "most efficient" dairies. For best milk production, the cows need to be kept happy and healthy. That means letting them have a place to go out of their barn, walk around, lay in the sun, etc. Also pumping them full of hormones is a thing of the past. Source: lived on a dairy farm all my life